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    CB90
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    Member No.#4861
    Registered📅9th Mar 2018
    Last Online📅13th Apr 2024
    City📍Kirkby Stephen
    Country🇬🇧United Kingdom
    Gender♂️Male
    Age👶Not Provided
    Posts💬468
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    About
    Ex telecoms engineer, Father was a shipwright (wooden craft) learnt a lot from him, built model boats since I was 8.
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    Recent Posts
    💬 Re: NQD PX-16
    10 days ago by 🇬🇧 CB90 ( Commander)
    ✧ 4 Views · 2 Likes
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    Thanks Lew and Alessandro,
    Your both right about it being dangerous stuff, I think you should use small amounts at a time let it expand and dry about 3 days then do a bit more.
    The stuff I used was called straw.

    Regards Roy

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    📝 Watercat M12 (Jurmo Class) landing craft
    14 days ago by 🇬🇧 CB90 ( Commander)
    ✧ 17 Views · 5 Likes · 1 Comment
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    Hi Shipmates,

    I have been on Holiday, so this is a minor update, have added the middle window to the cabin.

    Have purchased a scale chair for the driver, which will need some modifications before fitting.

    Regards
    Roy

    📝 NQD PX-16
    14 days ago by 🇬🇧 CB90 ( Commander)
    ✧ 26 Views · 5 Likes · 3 Comments
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    Hi Shipmates.

    I have been on Holiday, when I return I found that the foam had distorted part of the bow and now I have a lot of work to sort it out.

    Putting that out my mind I continued by fitting the motors with their mounts, then used epoxy resin to strengthen the join of the hull and deck.

    Next cut away the rear to accommodate the twin rudders, and added pads to the transom to mount them.

    Then covered the mounting screws for the motors mounts with 0.4 mm ply. This will give a flatter and squarer surface underneath when finished.

    That's it so far!

    Regards Roy

    📝 Think it will work?
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 32 Views · 4 Likes
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    📝 Reply
    Hi Shipmates,

    This old motor may do the trick, if you can find one, (speed 700 turbo - C) will run on 12v. max 14v will soak up 250W.

    or better a old Bullet 30 a rare beast 12v to 24v.

    May be better to go lipo and brushless if speed is your thing.

    Regards Roy

    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 35 Views · 4 Likes
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    Hi Shipmates,

    Some bits of hardware old and new,

    New 2 flexi shafts (CW & CCW) and rudders also a large servo arm.

    Old motors (2860- 2730kv) and water cooling jackets and 20kg servo.

    (The rudders from my bit box where a bit too short and only had one water outlet).

    OMG I'm a compulsive hardware buyer (All because my parents didn't bye me mecchano, I had LEGO instead).

    Regards
    Roy

    📝 Large lipo
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 28 Views · 4 Likes
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    📝 Reply
    Hi Flaxbybuck,

    Looking at your diagram, I suggest that you use a 45A fuse at the battery only (the more fuses + more connections that introduce resistance and a failure point).

    The Fuse needs to be lower than your 50A max of your motor, (fuses can be fast blow or slow blow.)

    I would put in a low Ampere fuse run the boat full throttle in turns as well, and see if it blows, if it does, you need to recover the boat and put a higher value fuse in but still less than 50A.

    If it does not blow then your good to go.

    You need to protect the component with the least current rating.
    Automotive blade fuses and holder are easily available with a choice of ratings.

    Regards Roy

    💬 Re: Aerokits Patrol Launch
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 16 Views · 2 Likes
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    Hi Jon,
    People often use a thin layer of fine fibre glass and resin it takes some skill, there may be information on the internet
    specifically on model boats.

    This video may give you an idea of what's involved



    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 46 Views · 6 Likes
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    Hi Shipmates,

    And now for something completely different.

    I had a brain wave and thought I would add water cooling to a couple of cheap brushless ESCs that have been in my bits and bobs box. along with some spares for my FT011.

    In my computer box I had some heat transfer tape from a NVME SSD.
    So my ESCs had an internal heat sink, that was covered with heat shrink (black rubber material) I cut a rectangle out of it to expose the internal heat sink, then cut the thermal tape / putty to size and added the water cooling unit.
    Held them together with some pegs and used my hot glue gun to seal them together, and also the wire ends in an attempt to make the whole thing water resistant.

    Need to fill the bolt holes in the heat sink with hot glue.

    Regards Roy

    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 48 Views · 5 Likes
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    Finished foaming the hatch, and the hatch still fits, once the foam distorted the plastic on another NDQ boat.

    I then created a template of the transom, and cut out a forma to reinforce the stern and add the original plastic reinforcement as well via two screws in the stern.

    Regards
    Roy

    📝 Watercat M12 (Jurmo Class) landing craft
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 24 Views · 3 Likes
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    Hi Shipmates,

    Started work on wheel house front windows,
    I have been distracted with my PX 16, trying to do two builds is interesting, now have something to do while the glue dries.

    Regards Roy

    📝 Thank you Graham White
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 19 Views · 1 Like
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    📝 Reply
    Hi shipmates,

    Fab videos by Graham, well impressed.👍⛵🚤



    https://www.youtube.com/@RETSUB12/videos
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    📝 Large lipo
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 39 Views · 5 Likes
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    📝 Reply
    Hi shipmates,
    You can by Lipo alarms, that plug into the Balance charging connector and monitors all the cells if they become low, it will set off a loud buzzer, they are not expensive.



    https://www.amazon.co.uk/Battery-Voltage-Monitor-Checker-Indicator/dp/B0B6N46V5Z
    📝 Insurance for UK/ EU/ world
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 43 Views · 3 Likes
    Flag
    📝 Reply
    Hi Shipmates,

    We live in a world where people will quite happily sue or claim damages if an accident occurs, which potentially can be very costly.

    The Model Power Boat Association can provide Insurance for UK modelers.

    Currently (2024) the cost is around £20 for the year.

    Please read web page for details.



    https://www.mpba.org.uk/insurance/
    📝 Large lipo
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 56 Views · 5 Likes
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    📝 Reply
    A fuse is a good idea as long as you can work out what the max safe current the motor can run at in Amps (Amperes),

    Most importantly is to prevent damage to the motor if something jams the propeller solid, weed, plastic bag. etc this causes the motor to stall and the maximum current will flow possibly damaging the motor and the battery, when this occurs a high current flows producing a large amount of heat very quickly, possibly melting connectors and wiring, even setting fire to the boat!⚡

    The max safe current for the motor should be in the motor specifications and the max for the battery will be determined by its 'C' rating times it capacity.

    I had a craft that had a 200A ESC and high power motor, I was running on the lake and the thing stopped dead, nothing! I was lucky when I got it to the side a plastic connector had melted (Deans) this was my fault as the connector is only rated at about 50A and my poor soldering didn't help, as any poor joint creates resistance and will heat up.

    Regards Roy

    📝 Watercat M12 (Jurmo Class) landing craft
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 27 Views · 7 Likes · 1 Comment
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    Hi Shipmates,
    As usual another error, the latest sliding door was not in the right position due to the frame being too far back, thus no gap between door and the rear cabin window, it was difficult to remove, but got it off and repositioned the frame and door.

    Previous to this I added a steering wheel and started to clad the front of the wheel house.

    Kind regards
    Roy

    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Commander)
    ✧ 51 Views · 5 Likes · 1 Comment
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    Hi Shipmates,

    Cut away excess foam, (pic 1).
    Then decided to foam the hatch, as this foam stuff doesn't last long in the tin once used for the first time.
    As usual foam always expands more than you expect.
    It looks like a Hover craft! (pic 3)

    The catamaran type have a tendency to over lift at the bow, the faster you go air can lift it until it does a backward summersault landing upside down.

    This happen to someone at the club and he lost his hatch for some reason! and the hatch lid sank to the bottom of the lake.

    So hopefully mine will not do that.

    PS These catamaran type racing boats are fair weather craft and can go fast , they are not the best in windy and choppy waters, they appear to skid round corners which is great in calm conditions, in rough water it could be exciting and disastrous at the same time.

    Regards
    Roy

    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 58 Views · 5 Likes
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    Hi Shipmates,

    Later this evening I inverted the hull and used a hot glue gun to make a better seal of the two halves deck and hull.
    Note. This glue will solidify quickly it will not run into the hull, later I hope to fill the joining tray with a liquid resin.

    Regards
    Roy

    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 60 Views · 1 Like
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    Hi BOATSHED,
    A few years ago I modified another NQD with limited success, the hull shape was poor, as the underside of the hull was curved up at the stern and it really didn't plan well. but it was my first venture with twin brushless.



    blogs/39797
    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 60 Views · 5 Likes · 1 Comment
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    Hi Shipmates,

    After removing stickers and cleaning inside and out, foamed front of hull for strength and flotation.
    I will need to trim the foam back once fully cured with a blade, may create a wooden former to tidy across the end of the foam.

    Regards Roy

    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 82 Views · 12 Likes · 2 Comments
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    Hi Shipmates,

    After many years I finally found one at a good price £20 plus £10 p&p on good old Ebay.

    I have a load of hardware sitting around, motors rudders etc. So I decided to play about with this boat.

    Generally it is considered a waste of time and money to do anything with these boats.

    So I don't expect any 'Likes' on this project, its a bit of a daft thing to do.

    Information about 32in long twin stepped catamaran hull, beam 9.25 inches, thin ABS plastic.

    First stage.
    Unpack and check, strip out all of the hardware, generally unscrew components, most difficult thing was removing the propeller shafts.

    Second stage wash hull with warm soapy water (in the Bath) and remove stickers.

    💬 Re: MAS 562 update
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 18 Views · 1 Like
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    Hi Alessandro,

    The length of the model is 75cm ad beam is 20.2cm
    the propellers are 35mm cw and ccw they are near to scale size.
    The boat is heavy for its size so is unlikely to plan with the old DC motors that I installed.

    I would suggest a larger model around 90cm more room for motors and batteries and better buoyancy.

    I would use lipos and brushless motors and it will run well on the plan, construct with 1mm ply.

    If you want a small, and easy to construct model I would suggest a plastic kit made by Italeri
    discontinued but some left in UK see link to Amazon



    https://www.britmodeller.com/forums/index.php?/topic/61564-mas568-4a-series-mtb/
    https://www.italeri.com/en/product/1907/6/31
    https://www.amazon.co.uk/Italeri-5626-S-568-Crew/dp/B097HL9G7T/ref=sr_1_124?crid
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    💬 Re: Connectors
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 31 Views · 5 Likes
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    Gold-Plated 3.0mm Banana Plug Bullet Connector for ESC Motor Lipo Battery.
    there are various sizes from 2mm to 8mm diameter.

    link below copy and past into browser



    https://www.amazon.co.uk/FLY-RC-Battery-Banana-Connector/dp/B07WR1F8T8/ref=sr_1_
    📝 MAS 562 update
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 21 Views · 4 Likes · 3 Comments
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    Hi shipmates,
    Couple of pictures of it current state of the MAS 562.
    My Father turned the two torpedoes, but have not touched for a while.

    Too many boats not enough time💔😭

    Regards Roy

    💬 Re: Batteries
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 62 Views · 1 Like
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    Hi Isaac,
    Unfortunately lead acid batteries die if not kept charged, eg a continuous trickle charge.
    I remember having a new lead acid battery which I left for 6 months and it died, would not charge, I had to scrap it.

    (Please note. the weight required to get the boat to its water line may mean you may need to add mass to the boat via lead shot or other ballast)

    Personally if you don't use the boat very often, you may be better of with Nickle metal hydride as they don't mind going flat, even lipo batteries left for a year or two without charging will fail.

    The mAh of the battery depends on how long you want to run it for?
    And the total current drain of your motor(s) ?

    For example a 2000 mAh (2 amp hours) battery can in theory can supply :-
    4 amps for half an hour
    2 Amps for an hour
    1 Amp for 2 hours

    Regards Roy

    📝 How many boats?
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 23 Views · 5 Likes
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    📝 Reply
    Hi Shipmates,

    Some picture of my boats,
    but does not include others, in mid build or projects to finish some I have no photos of:-

    a Sun Tug 36in
    a Grimmershorn 40in
    a hydroplane
    a police boat
    a MAS MTB (Italian ww2)
    a small fishing boat
    a Water cat M12
    a NDQ boat
    a Tug Hull only
    a Marble head yacht 50in.

    others hat I haven't see for a while or have forgot about.

    Regards Roy

    📝 Tires
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 22 Views · 0 Likes
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    📝 Reply
    Hi Westwind,

    1/32! You could use waxed cotton, or thin string. tied to existing bollards.
    A picture would be nice to see!

    Regards Roy

    📝 Watercat M12 (Jurmo Class) landing craft
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 30 Views · 8 Likes · 1 Comment
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    Hi Shipmates,

    A few more minor additions:-

    Completed basic construction of armour shield on top of cargo cabin both sides completed.

    Added strips to represent a ladder rack in the roof of the cargo cabin about 5mm x 1mm, up to the fore deck doors.

    Cut window hole and attached port sliding door to the main cabin.

    Also put some sides to the foot well of the control desk inside the main cabin.

    Regards Roy

    📝 Lipo Battery Reference charts
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 7 Views · 0 Likes
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    Chart1
    Show how a Lithium Polymer is wired and to the Balance connector and main battery output.

    Chart2
    Battery voltages of Lithium Polymer for various battery states.

    Information only Lithium Polymer Batteries can be extremely dangerous under the wrong conditions, eg. short circuit, charging a damaged battery. ⚡

    Lithium from my school days is a very light (floats on water)(while reacting with it), extremely reactive metal, it reacts with common substances, such as Air, water, and in pure form has to be stored in oil, if you held it in your hand it will react with you, most likely burning through your hand. Nasty stuff. Treat it with respect

    Note if a Lithium Polymer Battery catches fire do not put water on it as it will react with it, making the problem worse.

    When charging put in a fireproof charging bag on a non combustible surface such as a cement floor, just in case, better safe than sorry.

    Regards Roy

    📝 Watercat M12 (Jurmo Class) landing craft
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 31 Views · 9 Likes
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    Hi Shipmates,

    I added a flaring to the cargo body, and a movable armour shield top piece on to the rear of the cargo body, this can be inverted to provide some protection for the helmsman. on the model it is fixed down (otherwise I wouldn't be able to see were I'm going) joke.
    Truth, too much work and a breakable extra.
    Added to this a small shaped piece of ply on one side of the armour, other side to do .

    Cut a window in the first sliding door (starboard) of the rear cabin
    Cut out a second sliding door (port)

    Regards Roy

    📝 Watercat M12 (Jurmo Class) landing craft
    2 months ago by 🇬🇧 CB90 ( Commander)
    ✧ 41 Views · 7 Likes
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    A quick update, after a year off I am pleased to return to do some work on my project.
    In old age one thing that can allude us is enthusiasm, life seems to get more complicated and spare time vanishes away.

    I had to rebuild the sides of the cargo cabin, re-cutting all the windows and adding smoked Perspex windows.
    Next I added the twin doors to the top fore cabin (part of exit route for troops)

    Regards Roy



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