|||
Current Website Support
90
Contributors
15
Subscribers
You are Not Registered
Donate for your silver medal ๐Ÿ…
ยฃ10
ยฃ15
ยฃ25
ยฃ50
Subscribe for your gold medal ๐Ÿ…
ยฃ1
ยฃ3
ยฃ5
ยฃ10
You Will Be Helping Towards:

  • Domain Fees
  • Security Certificates
  • iOS & Android App Fees
  • Website Hosting
  • Fast Servers
  • Data Backups
  • Upkeep & Maintenance
  • Administration Costs

    Without your support the website wouldn't be what it is today.

    Please consider donating towards these fees to help keep us afloat.

    Read more

    All donations are securely managed through PayPal. Amounts donated are not published online.

    Many thanks for your kind support
  • Join Us On Social Media!
    Model Boats Website
    Model Boats Website
    Home
    Forum
    Build Blogs
    Media Gallery
    Boat Clubs & Lakes
    Events
    Boat Harbour
    How-To Articles
    Plans & Docs
    Useful Links
    Media Gallery
    Search
    Page 1 of 132
    >>>
    >
    1/4
    ๐Ÿ”
    ๐Ÿ“ท Atlantic 85 1/12 scale scratch-built
    8 days ago by EricMB ( Chief Petty Officer 2nd Class)
    Flag
    More work on the little boat today #lockdownfun
    ๐Ÿ‘ Like
    6
    ๐Ÿ’ฌ Comments
    1
    ๐Ÿ‘€ 68 Views
    ๐Ÿ’ฌ Re: Atlantic 85 1/12 scale scratch-built
    7 days ago by Martin555 ( Fleet Admiral)
    Flag
    Hi Eric.

    Looking good.
    I would be interested to see more photos of this Lifeboat and its crew.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 44 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ GRAUPNER OPTIMIST REFITTED, FIRST SAIL IN 22YRS
    8 days ago by jbkiwi ( Admiral)
    Flag
    Finally got a good day, so raced down to the pond and threw the boat in. 2 problems, 1: battery had run down a bit with all the testing, and the new 18kg digital servo winch needed every bit of 4.8v, so functioned intermittently, meaning not much sail control, 2: jib boom needs a kicking strap to stop it 'skying' and tangling (knew it would happen but wasn't a worry). Apart from that, everything worked perfectly ( cheapo China Futaba knock -off rudder servo still worked fine on the low battery which is a bonus)

    Sailed brilliantly like it did over 40 yrs ago, and as it's set will sail hands off on a reach, being nicely balanced, (even with the crappy jib,- which I had to make,- well actually my mother made for me,- back in 1980 after the original was stolen by a kid at the beach, while my back was turned๐Ÿ˜ ) Funnily enough it was made on the same Bernina I used to sew (horrendously) the jib foot after trimming it for the boom a few days ago.

    A few more things to improve and add, but pleased to have it back on the water. Another crap video, -seems to get blurry once it's been through the movie editor and You tube ) One day santa might bring me a Gopro, ("yeah right"!)
    ๐Ÿ‘ Like
    7
    ๐Ÿ’ฌ Comments
    4
    ๐Ÿ‘€ 80 Views
    ๐Ÿ’ฌ Re: GRAUPNER OPTIMIST REFITTED, FIRST SAIL IN 22YRS
    8 days ago by roycv ( Leading Seaman)
    Flag
    Hi the Graupner yachts are the best, I have a Gracia and she sails very nicely and such a pleasure to watch. She had a small change last year to the servos and works for ever on a 4 AA cell pack 2300mAh. I have a little less sail area and have a sail servo the same size as a standard servo and this copes OK.
    regards Roy
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 72 Views
    2
    ๐Ÿ’ฌ Re: GRAUPNER OPTIMIST REFITTED, FIRST SAIL IN 22YRS
    8 days ago by Graham93 ( Captain)
    Flag
    JB,

    Looks like a perfect day. I find sailing very relaxing and quiet, with no engine/motor noise. Can be quite challenging though, especially when you need to bring it back in to the dock.

    Graham93
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 79 Views
    2
    ๐Ÿ’ฌ Re: GRAUPNER OPTIMIST REFITTED, FIRST SAIL IN 22YRS
    8 days ago by jbkiwi ( Admiral)
    Flag
    Hi Martin, Nice and quiet and very relaxing, and with a decent battery you could run all day for free (almost) - the less you move anything (winch/rudder) the longer you can sail. You could go the length of the pond in the right wind with just a touch of rudder now and then. No shafts etc to worry about.

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 80 Views
    1
    ๐Ÿ’ฌ Re: GRAUPNER OPTIMIST REFITTED, FIRST SAIL IN 22YRS
    8 days ago by Martin555 ( Fleet Admiral)
    Flag
    Hi Jb,

    Did you find that more relaxing than an electrically power boat or just the same.?

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 79 Views
    1
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ Fiberglassing your hull
    17 days ago by Brightwork ( Midshipman)
    Flag
    I tried to put this up in the How To Articles...but it does not have url upload capability. So here it is. This is a very good video on how to work with fiberglass with odourless resin. It is very simple and should make those who are nervous about this process feel very confident.
    ๐Ÿ‘ Like
    3
    ๐Ÿ’ฌ Comments
    2
    ๐Ÿ‘€ 121 Views
    ๐Ÿ’ฌ Re: Fiberglassing your hull
    14 days ago by Ianh ( Lieutenant Commander)
    Flag
    This is an excellent Video.
    I can't get Eze Kote is SA but, I can get Z Poxy products.๐Ÿ˜Š
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 109 Views
    ๐Ÿ’ฌ Re: Fiberglassing your hull
    17 days ago by Madwelshman ( Chief Petty Officer 2nd Class)
    Flag
    That's a good, handy video.
    Thank you for sharing it.

    Will
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 123 Views
    4
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ "Majestic" - Stern Trawler
    18 days ago by philcaretaker ( Lieutenant)
    Flag
    RC Stern Trawler - "Majestic" by Thunder Tiger. Model owned by Buxton Model Boat Club member Adrien.

    For more photos, highlight and click the following link :-

    https://model-boats.com/places/60518
    ๐Ÿ‘ Like
    3
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 131 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ CHRISTMAS CHEER !
    23 days ago by philcaretaker ( Lieutenant)
    Flag
    Just for fun ! (I did this for the local school kids where I was caretaker about 6 years ago).
    Best wishes to all !!โ›„
    ๐Ÿ‘ Like
    5
    ๐Ÿ’ฌ Comments
    1
    ๐Ÿ‘€ 149 Views
    ๐Ÿ’ฌ Re: CHRISTMAS CHEER !
    23 days ago by Martin555 ( Fleet Admiral)
    Flag
    T'ink dat cool Phil.
    Liking dat man.

    Congrats Rasta Lieutenant.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 146 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ Going fishing !
    25 days ago by philcaretaker ( Lieutenant)
    Flag
    Going fishing - through the Dire Straits with Mark & David . - Just for fun !.
    Christmas greetings to all !

    For more photos follow link :-

    https://model-boats.com/places/60518
    ๐Ÿ‘ Like
    6
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 157 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ Submarines
    27 days ago by philcaretaker ( Lieutenant)
    Flag
    Just a couple of Submarines - from BMBC local Buxton Model Boat Club Submarine enthusiasts.

    DONT FORGET - More photos can be viewed on the link for " BOATS CLUBS & LAKES "

    ( Highlight the link, then Right click go to > )

    https://model-boats.com/places/60518
    ๐Ÿ‘ Like
    8
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 172 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    Second test was slightly better, using the aluminium spiral cut universal which came with the jet unit. As you can probably hear, it was horribly out of balance (even with cable ties to reduce it). It was not even drilled centrally and the spiral is right hand when it should be left hand, (like a spring twisted against the wind, it wants to deform). Slight improvement in speed on the first test (no slip this time) but the noise was horrendous.

    Have pulled the jet apart and found that the 3 blade prop is around 1 mm too small for the hole, causing cavitation (see loads of bubbles in the jet stream) which is causing loss of thrust. The prop is the wrong type as well, with rounded blades, so I have modified a larger prop with more pitch to fit snugly in the unit to hopefully increase thrust. The shaft is also wrong, with a flat cut almost half the diam and carrying on through the bearing, allowing the grease to fly out.

    I actually saw a Chinese site on Al Expr stating that "some dimensions on the product may be different due to the number of machines and operators involved in its' manufacture," SERIOUSLY!!??? their quality control must be utter crap and the operators not skilled enough to eat their lunch๐Ÿ˜ Why bother having a dimension at all?? Little wonder nothing fits properly.

    Unfortunately, most model shops sell the very same stuff, unless you want to shell out muchos dolleros for European stuff. I have just ordered some 4mm silver steel to make a new shaft, so a coupling or silicone tube will fit better. Also ordered some solid connectors to try. Vibration is wasted energy so it needs to be eliminated. Hopefully the mods will improve things and allow the motor to run on 4s rater than 3s. Worked out that the motor is only 1200KV, so it's only doing around 13,000 rpm under load. Probably will need around
    18,000 rpm for proper performance. Onwards and upwards (or forwards as the case may be.๐Ÿ˜)

    Sorry about the blurry vid again, but my camera lens is knackered.
    ๐Ÿ‘ Like
    5
    ๐Ÿ’ฌ Comments
    29
    ๐Ÿ‘€ 179 Views
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    I might have guessed he couldn't resist a reply๐Ÿ˜‚

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 169 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by Martin555 ( Fleet Admiral)
    Flag
    That Martin is a very naughty boy.
    I know on his School reports it said this boy is easily lead and is disruptive in class.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 168 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    Hi Graham, you can blame Martin for this, - he started it, - the little voice on your shoulder, saying "go on, you can do it" , - bet he was a trouble maker at school๐Ÿ˜‚๐Ÿ˜‚ Glad we can have fun and a bit of chain yanking. (LOL)

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 169 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by Graham93 ( Captain)
    Flag
    Thanks for the offer Doug:

    โ€œIf you're interested Graham I have such an 'Orange' receiver going spare cos it's not compatible with my Spektrum DX TX.๐Ÿ˜ญ I'd trade it for any old surplus Arduino board you may have โ€œ

    A few problems though:
    1. It also isnโ€™t compatible with my FlySky TX ๐Ÿ‘Ž
    2. Iโ€™ve never used Arduino, and donโ€™t have any surplus boards ๐Ÿ‘Ž
    3. Most important of all: Iโ€™m trying not to get distracted from my current build. There are just too many interesting challenges out there. Iโ€™d never get anything finished if I tried them all ๐Ÿ™„ Doesnโ€™t mean I canโ€™t think about how to solve them though..๐Ÿค”

    Seriously, thank you for the generous offer, but no thanks..

    Graham93
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 170 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    View All
    Hi Doug, I know it's a bit hard for people to get their heads around how a waterjet works (not accusing anyone of being senile๐Ÿ˜‚), as it is totally different to a prop drive (and something people don't even think about). I'm trying to think of a good analogy to describe how it works. Perhaps if you think of a jet engine using compressed air for forward thrust, then convert the air for water. It's mostly just the sheer force of the water being pumped that drives the boat forward.

    Re- on or under water while planing,- I've taken a screen shot from Hamilton jets site which shows quite nicely what I was describing. While they work well underwater at slow speeds, you can see the jets (arrowed) completely clear of the water and only hitting it way back at the wake intersection (where bottom and side displaced water rise up and meet), making the characteristic jet rooster tail. (I'm sure you will like this supplementary PDF๐Ÿ˜)

    http://depts.washington.edu/uwefm/wordpress/wp-content/uploa...

    I've included the Hamilton site (with the vid) for your perusal๐Ÿ˜Š Re the nozzle I've fitted,- the original 'splatter' nozzle is on the left and the new reduced close fitting one on the right. Another analogy๐Ÿ˜ for this is,- imagine blowing out while keeping your mouth open, then do it with your lips pursed,- the latter is more concentrated. Clear as mud?- you will be in the next episode of....................๐Ÿ˜‚

    https://www.hamiltonjet.com/global

    JB
    http://depts.washington.edu/uwefm/wordpress/wp-content/uploads/2017/10/manuscript.pdf
    ๐Ÿ”—
    https://www.hamiltonjet.com/global
    ๐Ÿ”—
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 172 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    View All
    Just bought 1 ea of these to try Doug, only prob will be delivery time๐Ÿ˜ด Will look at Krick as well to cover the bases maybe.

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 172 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    RE -Could try a pin and bush coupling. Standard practice in full size engineering as it transmits shock loads and could well be small enough to fit.

    Hi Ian, unfortunately don't have a lathe, otherwise I could solve a lot of model problems, (maybe Santa will bring me one?- yeah right!) I have a large mill which is very useful at times but no use for this stuff. The old ball/pin and dog system which I used on my IC boats is great but can't find any the right size. This is something which as you say, probably needs custom making.

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 171 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    29 days ago by jbkiwi ( Admiral)
    Flag
    Re, - You were dead right BTW, the red coupling in my Sea Scout was also from Krick

    Thanks for the info Doug, - very hard to find precision fittings any more, especially in a small size. Will have a look at the Krick stuff as I know it will be good. I thought of the old drive dog system which I used on all my nitro boats but I can't find a small enough one to fit . They take up any small mis-alignment and can run quite quietly when set up correctly, (also the strongest, long lasting coupling by a long shot, (still have some 42yr old ones which had had a thrashing behind an OS .45 RSR (rotary rear disc intake) for years which are still in perfect cond.

    Problem is, there is just not the selection today that there was back in the 70s and 80s with the loss of Graupner etc (old quality Graupner that is) and when boat racing was a big thing (especially in the states) Same with planes, with big money international pattern competitions etc going on ( big names like Wolfgang Matt, Bob Violet etc) . Haven't heard of any like that for years.

    I'll be waiting till next year if I order anything now as being down the butt of the world has its disadvantages round Xmas, (my coupling orders from Ali Exp apparently are going to take 10 days just to be shipped by the seller, let alone the rest of the crap, - read Feb next year if I'm lucky. Did try the new shaft and prop which was looking really promising till the shaft moved back and the prop hit the flow correcting vanes in the outlet, (lots of noise but no damage.) Not much room for a shaft collet so may have to cut a circlip groove to stop it.

    At least I'm lucky enough to have big boats to play with while I'm waiting. Better get the rods out and dust them off.๐Ÿ˜

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 171 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by Ianh ( Lieutenant Commander)
    Flag
    This Krick coupling is almost a gear type coupling and very good at transmitting high torque from the start up. But alignment is sensitive
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by Ianh ( Lieutenant Commander)
    Flag
    Could try a pin and bush coupling. Standard practice in full size engineering as it transmits shock loads and could well be small enough to fit. Easy to make if you have a small lathe.
    My memory of equipment built 40 years ago was the prop as such is a almost a 4-5 bladed turbine rotor that will just fit in the tube. As pointed out to stop cavitation.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by RNinMunich ( Fleet Admiral)
    Flag
    Hi again JB,
    Thanks for that vid, that looks very effective.
    What immediately struck me was the nozzle shape, just like the fire hose that you mentioned in your analogy.
    Can't remember what nozzle shape you used but I wondered if such a shape, maybe angled slightly down, might help improve the effective thrust?
    I appreciate what you wrote about 'the force of the water' etc, Newton's 3rd Law an' all that, + mass x acceleration etc. BUT, surely there is a secondary reaction between the incompressible water jet and either compressible air or more incompressible water.
    I hear what you say about various boats whose water jets are partially above the surface - but at what cost in extra power input?
    In your backpack water jet rider remember he is riding on that column of incompressible water.
    As soon as he goes too high and the column loses direct contact with the surface then ... SPLOSH!
    From what I have seen of jet skis the jet outlet is always under the surface. Planing should surely just push it deeper if the initial static balance of the vessel is right.
    Just my 'thonks' but wadda I know๐Ÿ˜‰
    Keep on jetting Man๐Ÿ‘ Guiness Book of Records look out ... JB's a comin'!!
    Cheers, Doug ๐Ÿ˜Ž
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 173 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by RNinMunich ( Fleet Admiral)
    Flag
    Hi JB,
    " this unit has the very coupling I mentioned (red). It is 3 parts and has a captive rubber cross in the centre. They look like a very nice coupling."
    Indeed, and very reminiscent of these I just bought from Krick, to try out on the two outboard brushless on my PTB refit.
    https://www.krickshop.de/Accessories-Spare-Parts/Accessories...

    You were dead right BTW, the red coupling in my Sea Scout was also from Krick๐Ÿ‘
    This one is exactly the size you need-
    https://www.krickshop.de/Accessories-Spare-Parts/Accessories...
    It's not actually a spiral, more succession of offset slots with a solid core. I have tried spirals and springs in the past and they all failed. Wound up and snapped or unwound and tangled under load.
    Ever tried buying a matched pair of LH and RH wound springs? Not easy๐Ÿค”

    Anyway the red job handles the 1000kv brushless, running on a 3S, into a 35mm prop at full load in my Sea Scout as long I want without a whimper. And it's absolutely SILENT๐Ÿ™‰๐Ÿ˜Š
    Another nice thing about the red job is that you can order it with a variety of inserts to match all the usual motor / shaft combinations, no shims needed. The inserts are also available separately.๐Ÿ˜Š
    Best is; when Krick say they are in stock (Auf Lager) and can deliver pronto - they are and they do!
    Prob about two weeks to you by Kiwi Post.๐Ÿ˜ (No Sampans๐Ÿ˜‚๐Ÿคฃ)
    Hope this provokes the odd thought or two (what else but odd from us experimenters?๐Ÿ˜)
    Cheers, Doug ๐Ÿ˜Ž
    https://www.krickshop.de/Accessories-Spare-Parts/Accessories-for-Ship-Models/Shafts-Couplings/Power-Heavy-Duty-Clutch-5-4-mm.htm?shop=krick_e&SessionId=&a=article&ProdNr=ro1446&p=192
    ๐Ÿ”—
    https://www.krickshop.de/Accessories-Spare-Parts/Accessories-for-Ship-Models/Shafts-Couplings/Stegkupplung-kpl-3-17-auf-4mm.htm?shop=krick_e&SessionId=&a=article&ProdNr=63902&p=192
    ๐Ÿ”—
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 173 Views
    4
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by RNinMunich ( Fleet Admiral)
    Flag
    View All
    This time I DEFINITELY do NOT want to know where the water would enter and exit poor ol' Jim!!๐Ÿ˜ฎ๐Ÿ˜ญ

    JB My first thought was also gyro gyro gyro!
    Maybe coupled with or instead an RX with built in stabiliser function?
    Intended to assist flying in windy weather.
    Could help to reduce the programming task Graham.
    If you're interested Graham I have such an 'Orange' receiver going spare cos it's not compatible with my Spektrum DX TX.๐Ÿ˜ญ I'd trade it for any old surplus Arduino board you may have ๐Ÿ˜‰
    Cheers, Doug ๐Ÿ˜Ž
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 173 Views
    3
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by jbkiwi ( Admiral)
    Flag
    You could use a quad copter gyro to steady him Graham, and a high pressure water pump run out the back of a fake jet ski (most are run off jet ski attachments) for realism?๐Ÿ˜ oops- sorry didn't mean to give you ideas๐Ÿ˜‚ You could do it like they have at a waterpark display here, where a clear water tube is hidden by the falling water from the object (can't remember what it was,- dolphin I think), making it look suspended on a water jet.๐Ÿ˜

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 173 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by Martin555 ( Fleet Admiral)
    Flag
    LOOKOUT COUSIN JIM LOL!!!!

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 174 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    30 days ago by Graham93 ( Captain)
    Flag
    JB, Martin,

    I do like a challenge, but I think that might be a step too far.๐Ÿ˜” There are low cost 3 axis accelerometer chips that would enable the measurement of orientation that would be needed, but using the data from them to control the jets, and making it all waterproof ...

    There again, I do have Bionic Billโ€™s cousin, Jim, sat in the workshop with nothing to do....๐Ÿค”

    Graham93
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    The video 'Awesome Water Jetpack' could this be a future project.

    Cut it out Martin, you can't tempt me that easily, but Graham likes a challenge๐Ÿ˜‚ Controlling it would be interesting๐Ÿ˜!
    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 175 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    View All
    Just found these on Ali Expr, (made by TFL who make jet units) and bought one to try. Only problem is they are only in d4 x d4 so I'll have to look for a 4mm shaft motor or shim this one (jet's 4mm and motor's 3.16.)
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    View Video
    Just found this vid Doug, and this unit has the very coupling I mentioned (red). It is 3 parts and has a captive rubber cross in the centre. They look like a very nice coupling.
    Water Jet Thruster For DIY RC Boat
    โ–ถ๏ธ
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    4
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Martin555 ( Fleet Admiral)
    Flag
    Hi Jb,
    The video 'Awesome Water Jetpack' could this be a future project.

    I can just picture it 'Action man' or a friend of Graham's Bionic Bill flying about that will be a crowd puller.

    Just another little seed planted.LOL!!

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    View Video
    Re -Hi JB and Doug You might be on the right track. A club member has the Graupner Atlantic Challenger the azimuths sit literally in the water.

    Hi Ian, good thought, but as mentioned to Doug, the jet nozzle is only in the water at rest,- once the boat is planing the nozzle is out of the water and it's mostly the water jet thrust doing the pushing work. See vid in my reply to Martin. A similar effect can be seen on those water jet packs which are working in air.

    JB
    Awesome Water Jetpack - Compilation 2015
    โ–ถ๏ธ
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    View All
    Re,- Can it be that the water jet is too high in the hull?

    Shouldn't be Doug, it can't go anywhere else as it's a fixed unit. The nozzle is pretty much under water at rest and it picks up water immediately which shows it's ok for position. Jet nozzles don't need to be under water (once planing they are out of the water anyhow) as its the force of the water jet which gives the thrust, (think fire hose) Problem is as mentioned that it's just a crappy unit which needs a few tweaks to improve it. I've fitted a high pitch racing prop and filed it down to fit with about .2mm clearance which is way better than it was. The new shaft I'll be making will help centre any coupling (if it's reamed, not drilled to the correct ID) Problem with Chinese stuff is that it appears mostly just drilled to a final size (which is usually a 'nothing size') and invariably sloppy.

    I have a tray full of prop drives for planes and they are all different and some are so bad as to be unusable,- 1 in 5 might be a decent fitโ˜น๏ธ. The only reasonable ones are either collet types or bolt on, and even they can be a pain to balance. I like the look of your krick? red connector and I have seen some 2 piece connectors with rubber inserts which would be ideal,- but finding any with the correct hole sizes is the biggest problem. Anything spinning really fast (ie 20,000 rpm, needs to be pretty much perfect.

    The aluminium spiral one I have has both grub screws on the same side, thereby making it useless for high speed (plus as mentioned the wind is the wrong direction) Motor itself is perfectly balanced and is a ball bearing, brushed 1200kv 12-24v so that's no problem. Jet unit has 2 bearings on the impeller shaft and spins smoothly with no play (unusual) and the motor is mounted to an aluminium plate which is part of the jet unit, (bolts onto the foot) and is surprisingly accurate. I have ordered some solid joints to line it all up perfectly (as you have mentioned) and am having an intensive search for a compact rubber insert joint (can't be longer than 20mm) to remove any fine vibration problems.

    Not sure how strong the red connectors are (this motor might tear them) but they might be a solution, (need to be LH wind and have a 3.16mm-4mm option) Pic is of correct impeller types, (they are not like an ordinary propeller, being a constant diam) -may need to lash out on a 26mm one๐Ÿ˜ฎ, (not cheap!) Pick-up grille might be another problem as the slats are horizontal not vertical, which might also cause cavitation. Might have to make a brass one if all else fails. Every little bit will help๐Ÿ˜ (Top prop in pic is the modded one)

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Martin555 ( Fleet Admiral)
    Flag
    Have fun with your experiments Jb.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    View Video
    Re -I have a feeling that this could end up with a prop and rudder.

    Had thought about it originally Martin, but thought I'd have a go at the jet, (or a V-drive using a crawler drive splitter) as this was one of the main propulsion methods for this model Hartley. The motor is a brushed unit which can run up to 24v but is low kv, and it would be a job to get a 4s in the boat (maybe a small one). It would do better with a high kv (2000kv) inrunner on 4s as the prop is only 27mm and needs to scream to get decent thrust.

    The jet is only a cheap modified one so as I mentioned, a lot of experimenting needed to get the max out of it๐Ÿ˜. Most of the model jet boats you see really flying, are quite small and light weight with really powerful water cooled in-runners on anything up to, 6s, and with expensive one way (no reverse) jet units with aluminium or stainless impellers. I could do with another 2-3mph which would be about scale, but not interested in a pond rocket as that's not the intention (I can knock one of those up in a week). Just a matter of playing with different ideas till it comes right๐Ÿ˜. If nothing works, then maybe ------- Here's a vid of what I'm up against, (power to weight)

    JB
    RCJETBOATAUSTRALIA rc jet boats with pumps. available models and water test
    โ–ถ๏ธ
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 176 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Ianh ( Lieutenant Commander)
    Flag
    View All
    And another shot!
    Gives you an idea
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 183 Views
    1
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Ianh ( Lieutenant Commander)
    Flag
    Hi JB and Doug
    You might be on the right track. A club member has the Graupner Atlantic Challenger the azimuths sit literally in the water.
    https://forums.offshoreelectrics.com/showthread.php?365-Graupner-Atlantic-Challenger
    ๐Ÿ”—
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 183 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Ianh ( Lieutenant Commander)
    Flag
    Hi JBKiwi,
    Another thing that robs torque is mis-alignment!
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 184 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by RNinMunich ( Fleet Admiral)
    Flag
    View All
    Hi JB,
    Can it be that the water jet is too high in the hull?
    Much of the jet seems to be dissipated above the surface, where it has no effect due to lack of resistance from air. Not easy to see clearly in these Lo Res vids๐Ÿค”
    Ref Prop shape; take a look at any Kort Nozzle to see the blade shape and how closely it is fitted to the nozzle. Of course to achieve the necessary close fit and good thrust there can be no vibration / misalignment in the shaft coupling which may cause the impeller blades to touch the jet tube sides.
    Have you inspected the tube for any damage? Gouge marks, frayed impeller tips?
    Use a rigid coupling (I whizz mine up on the mini lathe๐Ÿ˜€) to align the motor to the shaft; run the motor at low volts with an ammeter connected, twiddle the motor around until minimum current is indicated together with smooth running; max revs at min amps๐Ÿ˜€
    Spot glue the motor in that position (blobs of slow setting epoxy / filler can help at that stage), disconnect the whole set up and fix the motor permanently. Replace the rigid coupling with one allowing only minimal misalignment, like the spiral one I fitted to my Sea Scout (see pic) and all should be dandy.๐Ÿ˜€
    Cheers, Doug๐Ÿ˜Ž
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 179 Views
    4
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT, TEST 2
    1 month ago by Martin555 ( Fleet Admiral)
    Flag
    Hi Jb,
    I have a feeling that this could end up with a prop and rudder.
    I don't understand why she is under performing.
    It should be like a pond rocket with that big water jet hanging out of the back.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 179 Views
    1
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ HARTLEY FLARELINE, NEW PROJECT FIRST TEST
    1 month ago by jbkiwi ( Admiral)
    Flag
    Weather was perfect tonight for a test, so I did the 15km trip out to the Gulf harbour pond (most weed free pond) to throw the boat in. After a thorough under water hull inspection from the marine department, she was off. Everything worked ok except the silicone drive tube which had become enlarged due to soaking in the grease coming out the front of the jet shaft. It was slipping badly and probably losing about 60% of its' thrust. Manoeuvrability is excellent but reverse leaves a bit to be be desired. Steering in reverse is perfect but the thrust is not going forwards enough from the bucket. Might have to build in some nozzles to direct it better.

    Smoke air and water are working as well as can be expected, (smoke is a bit wafty, but with too much air introduced it will disappear as it gets thinned out too much to see) I was not expecting miracles as this was a bit of an experiment (modified cheap jet unit with unknown abilities) but at least it shows promise๐Ÿ˜. If I can find a coupling which is concentric it will solve the drive problem.

    Trouble is, the Chinese insist on making a 4mm shaft, 4.95 (or whatever) which is useless for balance in a 4mm ID bearing for example. Fine for cars, but no good for boats or planes due to balance requirements (it's a mission trying to balance plane props due to this thinking,- they do it with everything) shafts for electric motors are a nightmare at times as the play they build in, can ruin an otherwise good motor. I might have to buy a flexible rubber/nylon universal or a collet style( preferable as these take up any undersize on shafts) to fix it. They included a spiral alloy one with the jet unit which is as loose as a rooster in a sock, and only good for slower things like 3D printers etc. One of these days they will learn how to machine things to fit.๐Ÿ˜
    ๐Ÿ‘ Like
    7
    ๐Ÿ’ฌ Comments
    2
    ๐Ÿ‘€ 187 Views
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT FIRST TEST
    1 month ago by jbkiwi ( Admiral)
    Flag
    Seemed to work a whole lot better in the tank for some reason Martin. Possibly due to the coupling slipping, (the squealing is it slipping) Just a bit of silicone fuel tube. I use it on all the boats as it's quiet, self aligning, and lets go if your prop gets jammed by weed. Problem is with the jet, it has a flat on the shaft for some reason which doesn't help the tube grip, and lets grease in causing slippage. I'll sort it eventually,- didn't expect miracles first time out (same with planes) - Almost always some small initial problems.

    Motor should be spinning at 15,000 rpm with a 3 cell, but performance is not matching that, obviously,- just piddling along๐Ÿ˜ Mind you, I used to cruise like that in the full sized boat, as the Zodiac motor used to suck gas like nothing at 20 knots plus, (gallons per mile, not miles per gallon!)

    JB
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 187 Views
    2
    ๐Ÿ’ฌ Re: HARTLEY FLARELINE, NEW PROJECT FIRST TEST
    1 month ago by Martin555 ( Fleet Admiral)
    Flag
    Hi Jb,
    Nice to see her in the water.
    I am very surprised at the lack of reverse.

    Martin555.
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 187 Views
    2
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ HARTLEY SMOKE 2
    1 month ago by jbkiwi ( Admiral)
    Flag
    Smoke air and water switching sequence, (sound's out of sync for some reason,)
    ๐Ÿ‘ Like
    3
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 187 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ HARTLEY FLARELINE, NEW PROJECT - STARTUP SMOKE TEST
    1 month ago by jbkiwi ( Admiral)
    Flag
    A bit more refinement on the timing but getting there. Finally got the voltage regs from China to complete the system. A bit noisy, as the water pump is dry,- quietens down with water. Switches in stages using Grahams magic timer, - 1. smoke on, 2. water and air on. There is actually smoke running constantly at a reduced level once everything is running, but very hard to film. I could turn it up but I don't want it to look like it's on fire๐Ÿ˜‚
    ๐Ÿ‘ Like
    4
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 187 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ "Fairey Huntsman"
    1 month ago by philcaretaker ( Lieutenant)
    Flag
    "Fairey Huntsman" - Following renewed recent interest from Model Boats Website members,
    here are three variations from BMBC members of the popular "Huntsman".

    (Ref from Wikipedia)
    Fairey Huntsman / Fairey Huntsman 28 / Fairey Huntsman 31: The design of the Huntsman and its smaller sister, the Huntress were the inspiration of Ray Hunt and designed by Alan Burnard.
    ๐Ÿ‘ Like
    7
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 194 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ " Thor " - freelance design of a multicat vessel.
    1 month ago by philcaretaker ( Lieutenant)
    Flag
    Some details of Thor. - by Dean Ratcliffe.

    Thor is a freelance design of a multicat vessel. These rather unusual ships are real workhorses, designed as a work platform, often with a hiab crane. The square hull gives a large flat deck, with plenty of open space for a work area or for deck cargo. The design also enables the vessel to be used as a tugboat, either pushing or towing and are often equipped with large deck winches and strong points for this purpose. A true Swiss army knife of the sea, able to adapt to most roles, some even have additional internal fuel tanks for refuelling other vessels.
    More info found on -
    Model Boats Website - BoatClubs & Lakes - Buxton Model Boat Club

    https://model-boats.com/places/60518
    ๐Ÿ‘ Like
    3
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 194 Views
    >
    1/2
    ๐Ÿ”
    ๐Ÿ“ท Dovercourt on a sunny September day 2016
    1 month ago by mistyoptic ( Chief Petty Officer 2nd Class)
    Flag
    A couple of shots taken at Dovercourt in September 2016. I was visiting and so am not able to tell you anything of the boats or skippers. Dovercourt is a salt water pond and plays havoc with switches and brass fittings.
    Geof L.
    ๐Ÿ‘ Like
    2
    ๐Ÿ’ฌ Comment
    0
    ๐Ÿ‘€ 187 Views
    ๐Ÿ”
    ๐ŸŽฌ
    ๐ŸŽฌ Wee Nip - memories
    2 months ago by philcaretaker ( Lieutenant)
    Flag
    Just a short relaxing montage of memories.
    Local model club members sailing at various locations in and around Derbyshire after first lockdown !.โ›ตโ›ตโ›ตโ›ตโ›ต
    ๐Ÿ‘ Like
    4
    ๐Ÿ’ฌ Comments
    4
    ๐Ÿ‘€ 194 Views
    ๐Ÿ’ฌ Re: Wee Nip - memories
    2 months ago by philcaretaker ( Lieutenant)
    Flag
    View All
    PS , recently tried prop for auxilary power ! - but reverted to sail !! - Next, going to try a stern mounted deck mounted pusher !!!!!๐Ÿคž
    Phil
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 202 Views
    1
    ๐Ÿ’ฌ Re: Wee Nip - memories
    2 months ago by philcaretaker ( Lieutenant)
    Flag
    View All
    Hi Peter, nice to hear from you and that the majority of Australia and borders have re-opened and that you guys managing to get back to the lake/ pond !.

    Ok on your observations, for sails I mainly use ripstop nylon, mainly for colour variety and good light/med weather. I dont usually sail in heavy weather but I do have 1 suit made from a more ridgid sail cloth which certanly holds its form better. However, I do find that ,the ripstop does absorb streatch in heavier winds thus inducing a bit of "belly". I really must get hold of some mylar to try myself.

    I dont recall cutting to a triangular shape as I use a template (see photo) however I recently joined up two 2 panels with double sided tape, then did a 3 panel suit (again in ripstop) which
    added a batten like rigidity.

    I do enjoy trying out other materials and design options within the Wee Nip design brief, but now also getting fun from filming other members boats from the "Camera Nip".
    Take care Pete - cheers and beers !
    Phil
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 202 Views
    1
    ๐Ÿ’ฌ Re: Wee Nip - memories
    2 months ago by peterd ( Chief Petty Officer 1st Class)
    Flag
    View All
    Hi Phil and well done. A great video. We are out of lockdown in the majority of Australia and borders have opened, thank goodness. A question, I have noticed that a lot of your boats do not have the traditional Wee Nip sails, in that the large pocket at the front is now a simple slip on type pocket, or fitted like the yellow boat with yellow sails with the rings etc.

    I was given a few meters of a heavyweight mylar paper and have been experimenting with different sails, the current one being fitted to the mast with rings (small zip ties). I sailed it against the fleet last weekend in a swirling light breeze and it did reasonably well, especially after some tuning and in spite of the weight of the material used.

    My query is that I noticed the yellow sail was cut into a triangle shape, without the rounded shape on the back. Was that a benefit? Mine seems to bend or twist in that area and not form nicely, possibly causing issues on the water. Not helped by the weight.

    I will put up a couple of images that show it and see what you might think. I might be better off cutting into the triangle.
    Any thoughts gratefully received.



    Cheers
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 196 Views
    1
    ๐Ÿ’ฌ Re: Wee Nip - memories
    2 months ago by brianupyonder ( Warrant Officer)
    Flag
    does look nice and peaceful,i like your name partial to a wee nip myself
    brian๐Ÿ‘
    ๐Ÿ‘ Like
    ๐Ÿ’ฌ Comment
    ๐Ÿ‘€ 196 Views
    1
    Page 1 of 132
    >>>


    About This Website
    Terms of Service
    Privacy Policy
    Cookies used in this website are gluten free, wheat free and dairy free. By using this website you agree to our use of cookies. More Info