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    20th Scale ELCO 80ft PT boat part 1
    by CB90 πŸ‡¬πŸ‡§ ( Warrant Officer)
    πŸ“£










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    17 Posts 19 Comments 63 Photos 93 Likes
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    πŸ“ 20th Scale ELCO 80ft PT boat part 14
    14 hours ago by CB90 ( Warrant Officer)
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    Removed hull from building rig, it is much lighter now.
    Put reinforcements on the corners of the transom and cut off excess aluminium from the shaft support struts inside the hull.
    Roughly trimmed edge of hull.
    Applied some grain filler, once dry will sand down with fine sand paper and apply a primer then see what needs attention.
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    πŸ“ 20th Scale ELCO 80ft PT boat part 13
    8 days ago by CB90 ( Warrant Officer)
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    Added 3x rudder posts, and 6 exhaust ports.
    sprayed hull with primer, to help define shape of hull as can be confusing with multiple ply pieces.
    Refill base of hull, will do sides next.
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    πŸ’¬ Re: 20th Scale ELCO 80ft PT boat part 13
    8 days ago by Martin555 ( Fleet Admiral)
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    Hi CB90,
    I have just read through your build jog.
    You are doing a great job.
    Keep up the good work.

    Martin555.
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    πŸ“ 20th Scale ELCO 80ft PT boat part 12
    12 days ago by CB90 ( Warrant Officer)
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    After 2 years with little progress, too many model boat projects. I give you a update, basically sanded and filled the hull and foamed the bow.
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    πŸ“ 20th Scale ELCO 80ft PT boat part 11
    2 years ago by CB90 ( Warrant Officer)
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    In the words of Delboy, 'What a Planker, Rodney!'

    Started to added more sheets ply in diminishing sizes. and then down to 1cm planks for the bow. Unfortunately this did not work out as the planks were only 0.4m and were too flexible and were not being supported enough by the frames.
    So rip it all off the bow and use sheets again but changed from rectangular to triangular, this enable the frames to support the ply.

    Found I'm allergic to superglue fumes.
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 11
    2 years ago by RNinMunich ( Fleet Admiral)
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    Looks like an Armadillo 😁😁

    Enjoy the filling and sanding!
    Cheers, Doug 😎

    pt boat
    sanding
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    πŸ“ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by CB90 ( Warrant Officer)
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    Putting on the bottom skin of 0.8mm birch ply, in ever diminishing lengths.
    I changed my glue from PVA (502) to Gorilla glue.

    glue
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by RNinMunich ( Fleet Admiral)
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    Tidy work CB πŸ‘ but an odd way of doing it!? 😲
    You'll end up with a series of kinks instead of smooth curves, especially at the bow. Like I discovered in the PTB I'm renovating. See pics.
    Yep 'You CAN πŸ€”see the join'!
    Good luck, Doug

    pt boat
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by mturpin013 ( Captain)
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    Is there a reason for not using a full length skin? using a card template to ensure correct size then a one piece skin is surely quicker and smoother end product.

    pt boat
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by CB90 ( Warrant Officer)
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    This Boat is a bit experimental the main goals where for it to be light in weight, and also a more correct hull shape, also to keep cost to a minimum and as scale as practically possible.

    To answer the question about not using one single skin, is that ply will not bend in two directions, the sides of the hull have curves to them, the length of the hull is also curved, especially the bow but also curves to a narrower stern/ transom.

    The best way to skin the boat is by 60 degree planking in two alternating layers but this would make the hull too heavy for me to transport, due to back problems.

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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by CB90 ( Warrant Officer)
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    Quick picture of Motor Fans installed.
    (Black plastic is to protect motors from the glue.)

    glue
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by mturpin013 ( Captain)
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    Not sure your correct when you say ply doesn't bend in two directions. when building my crash tender the roof panels are a compound curve, I steamed them and let them set in a jig. I agree this will be somewhat more difficult when dealing with a full length skin but with some thought and appropriate jigs and clamps I think it can be done. Ill give it a go on my next build.

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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 10
    2 years ago by mturpin013 ( Captain)
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    sorry forgot the picture

    pt boat
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    πŸ“ 20th Scale ELCO 80ft PT boat part 9
    2 years ago by CB90 ( Warrant Officer)
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    Installed the three out-runner motors, I hope I never have to replace them.

    They have rubber mounting washers and nylock nuts and spring washers in M3.

    They are about half inch apart took a few hours to install with full access as currently boat has not been skinned.

    I hope to add small fans to the prop hubs to keep them cool

    Now have received the rudders and water scoops. they will be installed after the bottom skins are on.

    motor
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 9
    2 years ago by RNinMunich ( Fleet Admiral)
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    Just when you think you've seen everything - up pops a boat with airscrew spinners ! 😲 But a good idea to use 'em as fan spinnersπŸ‘
    Nice work mate, Cheers Doug 😎
    PS Looking at the first pic before expanding it I thought you were trying to build a 'Hover-chair' 😁😁

    build
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 9
    2 years ago by jbkiwi ( Rear Admiral)
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    I would check out the water cooled back plates for the out- runners as they will possibly run real hot if at all loaded up without cooling, unless you have fans like aircraft propellers (even then and in open air they still get hot!) I would look at this seriously to avoid cooking your motors. Hobby King usually has various cooling parts, or EBay, Aliexpress, Banggood etc. Bit late now I suppose, but water cooled in-runners (around 2000kv 28mm diam) are a better idea for boats. You can buy in-runners and water jackets to fit them as I did but they need flushing after use with CRC or similar to avoid rust, (I'll be copper tube wrapping the next lot, then there are no worries)

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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 9
    2 years ago by CB90 ( Warrant Officer)
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    Hi thanks for your input
    The pictures do not show the mini fans now attached to each motor which were robbed from PC cooling fans.

    The boat is not a performance craft I will hopefully only pull 20 to 30A from each of the low kv motors.
    Spec.
    2808 1400KV 14 Poles Brushless Motor
    Max Watt: 350W
    Voltage range: 7-15V
    Max amps: 35A
    No load: 1.2A

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    πŸ“ 20th Scale ELCO 80ft PT boat part 8
    2 years ago by CB90 ( Warrant Officer)
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    Hi
    Added the three motor mounts and reinforcements, predrilled mounting holes and shaft exit before fixing into position.

    Used a long shaft and a dab of paint on the end of it, to mark the points of the motor positions, the use a small right-angle to angle to set the mount 90 degrees to the shaft.

    Now waiting for some nuts, bolts, spacers and washers

    Thanks
    Roy

    paint
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    πŸ“ 20th Scale ELCO 80ft PT boat part 7
    2 years ago by CB90 ( Warrant Officer)
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    Have added reinforcing to the frame supporting the end of the shaft tubes, 3 pictures show dry fit.
    and once dry glue in shafts with epoxy resin, 3 pictures of fixed shaft tubes.

    Now looking at an extra part frame to support the three motor brushless out-runners.

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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 1
    2 years ago by RNinMunich ( Fleet Admiral)
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    Very brave - fitting the shaft tube before the skin 😲
    Rather U than me Gungadin! Have fun πŸ˜‰
    Or is that a dry fit just to prepare the shaft lines?

    pt boat
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    πŸ’¬ 20th Scale ELCO 80ft PT boat part 7
    2 years ago by CB90 ( Warrant Officer)
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    Hi RNinMunich,

    Should not be too bad as will cut ply slit/profile from tubes to the transom then reinforce inside under rudder compartment.
    rest of the tubes length are already supported.

    I really wanted to make sure the motors and shafts were in excellent alinement, and being able to see through the hull is a good advantage. (note. do not have facilities to make alignment tools).

    In previous models I have left it towards the end of the build to fix motors couplings and have found alinement to be a bit difficult, especially on smaller boats.

    motor
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    πŸ“ 20th Scale ELCO 80ft PT boat part 6
    2 years ago by CB90 ( Warrant Officer)
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    Dry fitting pro-shafts (Note, all shafts parallel with the keel)
    Drilled with an old prop-shaft which I modified to a cutting tool then finished with a round file and cut slots for propeller-shaft support bracket with a hacksaw, file and knife.
    Note these shafts are lightweight aluminium tube with steel liners and steel shafts. props at currently 40mm but as with all things scale things are not always practical in scale size such as propellers and rudders and in this case the direction of rotation (not all going round clockwise).

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    πŸ“ 20th Scale ELCO 80ft PT boat part 5
    2 years ago by CB90 ( Warrant Officer)
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    After some calculations I find I need to extend the reinforcing for the port & starboard shafts forward towards the bow.
    Created some wooden guides when drilling the prop-shaft holes
    and glued them in position temporarily, as you make expect the drill needs to be rather long, so I made one out of an old brass shaft basically sharpening it so it could cut wood.

    Next job will be to cut out for integrated shaft support brackets (2mm wide and minimum of 35mm long slot) and the tube shafts are 8.5mm in diameter.

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