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    NQD PX-16
    15 Posts · 5 Followers · 76 Photos · 81 Likes
    Began 3 months ago by
    Captain
    United Kingdom
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    Latest Post 21 days ago by
    Captain
    United Kingdom
    Most recent posts shown first   (Show Oldest First) (Print Booklet)
    📝 NQD PX-16
    21 days ago by 🇬🇧 CB90 ( Captain)
    ✧ 29 Views · 4 Likes · 2 Comments
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    Hi Shipmates,

    First run was successful, it could keep up with a racing mono, which looked expensive.

    There was some problems:
    The battery did not last long (singe 3300mah) which I think may be duff as when it arrived it had only 8v o/p this is a 14.8v battery so not good, I managed to charge it but it only lasted about 3 mins.

    The boat leaked internally, due to leaking water jackets, this is because the motors are ribbed so I have sealed them with some epoxy resin at ether end of the jackets.

    Next project is
    A 29in Flying fish up grade.

    Regards Roy

    💬 Re: NQD PX-16
    16 days ago by 🇬🇧 CB90 ( Captain)
    ✧ 12 Views · 3 Likes
    Flag
    Hi Boatshed

    I purchased the 29" Double Horse 7007 Flying Fish Remote Radio Control RC Speed Boat Ready to Run RTR from Amazon at £59.99


    https://www.amazon.co.uk/dp/B003KV8RKG?psc=1&ref=ppx_yo2ov_dt_b_product_details
    💬 Re: NQD PX-16
    19 days ago by 🇬🇧 BOATSHED ( Lieutenant Commander)
    ✧ 18 Views · 3 Likes
    Flag
    Hi CB90,
    Where did you get the Flying fish from? did you buy it new or was that another off of Ebay or somewhere else?
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    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Captain)
    ✧ 41 Views · 5 Likes · 1 Comment
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    Hi Shipmates,

    I've added a internal cover that will be taped down, made of 1mm clear Perspex.

    Put in the original receiver plastic box, now with a Flysky receiver and other cables in it.

    Original hatch will also be taped down.

    Regards
    Roy

    💬 Re: NQD PX-16
    1 month ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 42 Views · 2 Likes
    Flag
    Blessed duct tape. They even use it to repair real planes.
    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Captain)
    ✧ 45 Views · 4 Likes · 2 Comments
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    Hi Shipmates,

    Replaced a bolt in the rudders with a plastic bolt this is a deliberate weak point, in-case the rudders hit a log or submerged item, thus allowing the rudders to lift up and not rip off the transom.

    Added various stickers and a name of 'Catalyst'

    Currently working on a secondary inner water proof hatch.
    and touch up black portion of the boat.

    Regards
    Roy

    💬 Re: NQD PX-16
    1 month ago by 🇬🇧 BOATSHED ( Lieutenant Commander)
    ✧ 44 Views · 2 Likes
    Flag
    CB90
    My nice new brass propellors arrived today, earlier than predicted. I am very impressed. What a great service from them. I would definitely buy from them again. Thanks again for the informattion on where to buy them
    💬 Re: NQD PX-16
    1 month ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 46 Views · 2 Likes
    Flag
    Strong water cooling intake on the rudders.
    I really like the blue gecko.
    📝 NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Captain)
    ✧ 56 Views · 6 Likes · 4 Comments
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    Hi shipmates,

    Servos
    A change of heart with the single 20kg/cm servo the arm is large and needs an extension, thus even a 20kg will have a much reduced torque at a distance of around 6cm.
    By doubling the distance of the servo arm, we’ve halved the torque
    Force = Torque of servo (20kg at 1cm) / distance in cm
    20kg at 1cm
    10kg at 2cm
    3.33kg at 6cm this may not be adequate for two 4in rudders (part submerged)

    Thus I may revert to two 20kg servos instead of one that is over reaching.

    Dual brushless
    Dual brushless motor control is can be a problem even if using same 2x motors and 2xESCs, a 'Y' cable was not the answer for me, and one motor started turning before the other and hence run faster.

    I had to scrap that idea, and the answer was to use a more complex radio gear, a transmitter with built-in mixer(s)
    I had a spare 'Flysky' i6 and the following video showed me how to set it up.
    note. the offset shown in the video varies considerably between setups mine was +4, his was+44.



    💬 Re: NQD PX-16
    1 month ago by 🇺🇸 LewZ ( Commodore)
    ✧ 51 Views · 2 Likes
    Flag
    Hello Roy (CB90)... exactly what I was thinking. It would be very hard to find a simple setup to synch two motors with the variables involved which include not only the motors themselves, but the linkage all the way down to and including the prop.
    I find it much easier to the "original setup" you had in your photo and adjusting the boats direction running straight by trimming the rudder. In most cases we have a limited distance the boats can travel straight. Interesting conversation👍.

    Lew
    Florida 😎, USA😍
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    💬 Re: NQD PX-16
    1 month ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 48 Views · 2 Likes
    Flag
    Thanks Roy for sharing this information and especially the video, it's very helpful.
    💬 Re: NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Captain)
    ✧ 46 Views · 3 Likes
    Flag
    Hi LewZ,

    I did not use a ' 'Y' cable was not the answer for me'

    What I was trying to achieve was to synchronise the two motors .
    Note, the two ESCs start up at at different
    points of the joystick initial movement, even
    when they initialise together, this must be
    component differences/ tolerances and or some mechanical resistance.

    Thus as per the video I mixed the two channels (3 master & 5 slave)
    channel 5 is the joy stick for steering and 5 has no input then an offset value used to bring the two motors to close to having a simultaneous start, which they did not before.
    💬 Re: NQD PX-16
    1 month ago by 🇺🇸 LewZ ( Commodore)
    ✧ 60 Views · 3 Likes
    Flag
    I'm not too sure what your are trying to achieve with the two motors, two ESCs, and a "Y" cable plug and the mixing.

    I watched the video and I also use a few I6X radios (plus others). I don't see how this all would work on one channel. Several of my boats have multiple motors and props.

    Perhaps if you could sketch out a schematic or an explanation on what you are trying to do, one or more of us can help.

    Lew
    Florida ⛱️, USA 🇺🇸
    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 62 Views · 6 Likes · 5 Comments
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    Hi Shipmates,
    Having a few days off work has enabled me to play.

    I cut back the prop shafts as I wanted to at a collet around the flexi shaft, you may wonder why, well if the coupling fails for what ever reason it will stop you losing your flexi shaft and propeller.

    I painted the hull a lime green, added the water cooling hoses in blue, drilled the transom for the rudder linkage bellows and drilled holes for 4 water outlets two per side of the boat, then connected up all hoses.

    Soldered connectors on the two ESCs and tested motors and ESCs, (note disconnect positive + of one of the ESCs stops both BECs powering the system.)

    Kind regards
    Roy

    💬 Re: NQD PX-16
    1 month ago by 🇬🇧 CB90 ( Captain)
    ✧ 56 Views · 1 Like
    Flag
    Hi BOATSHED,

    You should get them in about a month max.

    I have the same problem finding suitable water, my club is about 35 miles away.

    Regards
    Roy
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    💬 Re: NQD PX-16
    1 month ago by 🇬🇧 BOATSHED ( Lieutenant Commander)
    ✧ 60 Views · 2 Likes
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    Hi CB90
    I went back onto that site, I made them an offer and I have a pair of those nice propellors on their way to me. Only trouble now is when they arrive (it's says about 18-20th June I'm a Bit dubious from China) I don't know when I will be able to get to use them.
    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 BOATSHED ( Lieutenant Commander)
    ✧ 62 Views · 2 Likes
    Flag
    CB90,
    Many thanks for your reply with this information.
    I will be getting a couple of those, I have been looking for decent metal props so that I can experiment when I am out with 2 of my boats. Proboat Miss Geico this is great on the water but never tried a different prop on her. Also my Graupner Rhode Island F1 Tunnel Hull, this one I have never had it out on the water yet. I am a bit scared of it as I have never run a brushless outboard. I have also started to build a bigger tunnel hull she's about 32" I think.
    Last time I run an outboard on a model boat was way back in the 70's, it was a K&B 3.5cc that was a beast to run. My friends who was with me wouldn't put there boats out when this was running. I think the Graupner one will be much faster and scarier. I will also be after a3 bladed prop to play with. I have a couple of Plastic one's to try first to see how they fare. My only trouble is I dont live very near a decent pond to run a boat on,
    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 60 Views · 3 Likes
    Flag
    Hi Boat shed
    the props are 36 mm for 4mm shafts from ebay

    Hurry last pair


    https://www.ebay.co.uk/itm/173893920808?itmmeta=01HRAWCW5C50E4ZM78MKEAX44A&hash=
    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 BOATSHED ( Lieutenant Commander)
    ✧ 64 Views · 2 Likes
    Flag
    I take it that the shafts are 4mm , what size are the propellors, and where did you get them from, please? It all looks very tidy in there.
    When will you be posting a maiden run video ??I cannot wait to see that going.
    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 3 Likes · 3 Comments
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    Hi Shipmates,

    Added some reinforcement to the sides (oak strip) and added cooling fins to motor water cooler jacket which is also glued to the oak strip.

    Another reinforcement that cannot be seen is in the humps ether side of the hatch area, which where very flimsy.

    Also added a carbon fibre battery tray.

    Regards
    Roy

    💬 Re: NQD PX-16
    2 months ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 70 Views · 2 Likes
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    Very good Roy, I watch and learn.

    It's true I happened to see motorboats in the lakes that capsized almost immediately, they only managed to make it a few metres.
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    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 3 Likes
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    Hi Alessandro,

    Your right about the weight factor, but this hull is very thin and it would flex, I am only putting in one battery and hopefully one servo, but I decided I wanted two motors in the rails (lower COG) rather than one bigger motor in the middle.
    The two rudders are for control, these will not give max speed, but will hopefully keep the bow down, as these tunnel boat have a tendency to flip and the pond I will use it on is small, so control is important.
    Picture shows normal mods, keeping things simple, but note major reinforcement to set drive shaft and motor to the middle, Shaft in this position will increase drag and the larger 36mm diameter motor will raise the COG.

    Regards
    Roy
    💬 Re: NQD PX-16
    2 months ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 70 Views · 2 Likes
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    Hello shipmate Roy, you are right to reinforce the structure.
    You're keeping tabs on the total weight, right?
    I'm not an expert on fast motorboats but I believe that lightness is one of the fundamental factors for being able to gets up on a plane.
    I continue to follow you with interest.
    📝 📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 3 Likes · 5 Comments
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    Hi Shipmates,

    After nearly 4 weeks after foaming I drilled the distorted area, and liquid foam appeared. (shows what pressure it had created, warmed the hull and let excess escape).

    Added prop shafts (epoxy) and rudders (4 bolts each).

    More filling and sanding to square up the hulls underside, curved edges will slow the boat.

    Regards Roy

    💬 Re: 📝 NQD PX-16
    2 months ago by 🇺🇸 Len1 ( Lieutenant)
    ✧ 73 Views · 2 Likes
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    WOW. Really shows how much pressure the expanding foam must generate. Like the progress.
    Len
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    💬 Re: 📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 2 Likes
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    Hi LewZ,

    Thanks for the tip, funny I did that on my Watercat M12 (Jurmo Class) landing craft, because of problems with foam but I forgot why, and was impatient, cost me more time in the long run.

    Regards
    Roy
    💬 Re: 📝 NQD PX-16
    2 months ago by 🇺🇸 LewZ ( Commodore)
    ✧ 73 Views · 2 Likes
    Flag
    Roy, et al. The incident that I mentioned where the foam expanded too much happened 50+ years ago. I resort to making floation to fit into the hull then fasten it in place. Lew, Florida 😎, USA 🇺🇸
    💬 Re: 📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 3 Likes
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    Hi Alessandro,

    The boat does look a mess, but I hope I can tidy it up a bit (plastic padding to the rescue), It looks like most of the damaged areas will be out the water when it gets up on a plane. (If it gets up on a plane).

    Regards Roy
    💬 Re: 📝 NQD PX-16
    2 months ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 70 Views · 2 Likes
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    Hi Roy, I'm sorry you had to work twice as hard because of the foam but if you solved it in the end, I'm happy.
    📝 NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 82 Views · 6 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

    💬 Re: NQD PX-16
    2 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 71 Views · 4 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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    💬 Re: NQD PX-16
    2 months ago by 🇺🇸 LewZ ( Commodore)
    ✧ 75 Views · 3 Likes
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    I don't know what type of foam you have been using. Some will exert pressure and distort where it is applied. Looks like this is what you have. (My first model boat has an extremely high cambered deck with splits do to me using this type of foam.)

    Your hull looks to be vacuum formed ABS (basically styrene). The first thing I would do is remove the foam wherever is has caused distortion. Next re-check the hull. If distortion still exists, you will have to reform the hull. You will probably need to build a jig to force the hull back into shape you want then carefully apply heat (heat gun). (This is how the hull was made in the first place.)

    Remove from jig. If did not go all the way back to normal you might need to over compensate holding the hull to allow some "spring back" and try heating again.

    Tip: "Window and Door foam" does not exert pressure. Prevents windows and doors from distorting.

    Lew
    Florida, US
    💬 Re: NQD PX-16
    2 months ago by 🇮🇹 AlessandroSPQR ( Rear Admiral)
    ✧ 81 Views · 3 Likes
    Flag
    Hi Roy.
    I was afraid to tell you and I didn't want to jinx it but foam (if that's what I mean) is "dangerous" for modeling in my opinion.
    It grows uncontrollably.
    I have used it for other purposes, other than modeling, and I realized that if it doesn't have the right vents it is capable of deforming even metals.
    I hope you can fix the warping. I can't see it well from the photos, it doesn't seem excessive to me but maybe I'm wrong.
    📝 NQD PX-16
    3 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 91 Views · 5 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

    📝 NQD PX-16
    3 months ago by 🇬🇧 CB90 ( Captain)
    ✧ 95 Views · 7 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

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