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Thread: U-3 1/8 scale Hydroplane.

  1. #31

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    Got a bit done in the last few days.
    I made some paper templates for the sponson deck skins, transferred them to the ply & cut them out.
    To make the paper shapes I lay a sheet of good old butchers paper over the area & run my fingers along the edges of the framework, creasing the paper.
    Cut the paper about 1/8" bigger.

    After trimming & sanding the inboard edge of the panel to match the main stringer, that runs from the tip of the sponson to the transom, they were given a coat of epoxy fiberglass resin on the underside.
    The whole inside of the boat was also coated with the resin at this point.
    Foam blocks were cut & fitted into all the spaces & sanded to shape.

    Then on went the sponson deck skins.
    I placed a bead of 1 hour epoxy on all the internal frame work, placed the skin in it's exact place & tacked it down at the transom & at the main bulkhead of the heels of the sponsons.

    The left hand skin needed a cut on the underside of it to relieve the pressure where the framework sort of curves down & then levels out towards the chine, creating dip in the skin.
    Then I stitch glued around the edges, keeping the skin pressed down & flat. Working forward from the transom. Some CA accelerator in the pump spray bottle is a great thing to have here, as everything is held in place by hand during this operation. The boat needs to be rotated upside down & sideways to get the CA to flow where you want it to go.
    Then a bead of CA is run along the joins, a section at a time, allow the glue to wick into the joint then squeeze together & spray with accelerator.

    Of course the other method of Epoxy on everything & an array of weights, tape & clamps also works.

    Creasing the paper templates.

    001.jpg

    The dip in the left side deck.

    007.jpg

    The cut in the underside of the deck.

    009.jpg

    All glued on ready for final trimming & shaping.

    011.jpg

    The left side skin with the dip.

    010.jpg
    Last edited by 785boats; 02-10-2018 at 04:49 PM.

  2. #32

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    Are you going to build the tiplets/hydroshoes, at aft end, like the full scale. If so please document with pics, Thanks.

  3. #33

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    Hi lambo.
    I did give them a mention & a photo in post #23.
    Here's a bit more detail.
    I simply cut, bent & sanded to shape, the bottom ride pad. I chamfered the edge that glues to the anti trip skin to the same angle, & glued it on flush with the air traps. To keep it level I ran a straight edge across from the other side of the boat, & overhanging the ride pad while the ca glue set.
    Then the side of the pod was cut & bent to shape & glued on. A little infill piece was added to the transom & then a piece of thin 0.04mm ply was glued on covering the whole transom of the pod to cover the join in the ply.
    If I had been thinking properly earlier in the build I would have cut the rear skin on the hull to the correct shape so the last couple of steps wouldn't have been required. Maybe you will learn from my mistake & get it right.
    All the edges were sanded to shape.
    I had no dimensions to work with, so I just winged it from the photos & videos on the internet.

    Because the rear transom is a different shape on each side of the boat, the transoms of the pods are different too. See the pics below.
    I hope that helps a bit.

    Port side sponson.

    004.jpg

    Starboard side.

    005.jpg

  4. #34

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    I couldn't help myself this morning & had to assemble a few of the bits for the engine. The intake & exhaust manifolds were joined together, as were the 4 turbo casings.
    A lot of sanding was then involved in reducing all the banding lines on everything.
    Then I coated everything with high build spray putty to fill in the all the lines that were left.
    I'm back into the sanding again now,
    Man it's hot today. I had to wash the dust down my throat with some Coopers Original Pale Ale.

    003.jpg

  5. #35

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    Hey Paul......I'm smelling more of that birch ply sawdust clear over here....LOL

    I just saw this thread.....great project and the boat is looking amazing! Wouldn't expect anything less! It will be interesting to see how the final turn fin is mounted on this. I'm trying to visualize it. I know on my Elam the sponson heels had that same angled piece coming down just above the ride pad. I ended up mounting the turn fin to the heel of the sponson to get the fin 90 degrees and then built a box shape around the turn fin bracket. Not quite to scale but it worked....LOL

    I love that motor.....the things the 3D printing world can put out there is amazing. I actually ordered a Anet A6 ( Prusa i3 clone) printer last week...LOL. Have to build the darn thing first...HAHA. But I am looking at all the things that can be built.....rear wing sets, canards, canopies, drivers...etc. It's endless!

    I'll be watching the build as it develops....Looking Great!

    Mike

  6. #36

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    Quote Originally Posted by Speed810 View Post
    Hey Paul......I'm smelling more of that birch ply sawdust clear over here....LOL

    I just saw this thread.....great project and the boat is looking amazing! Wouldn't expect anything less! It will be interesting to see how the final turn fin is mounted on this. I'm trying to visualize it. I know on my Elam the sponson heels had that same angled piece coming down just above the ride pad. I ended up mounting the turn fin to the heel of the sponson to get the fin 90 degrees and then built a box shape around the turn fin bracket. Not quite to scale but it worked....LOL

    I love that motor.....the things the 3D printing world can put out there is amazing. I actually ordered a Anet A6 ( Prusa i3 clone) printer last week...LOL. Have to build the darn thing first...HAHA. But I am looking at all the things that can be built.....rear wing sets, canards, canopies, drivers...etc. It's endless!

    I'll be watching the build as it develops....Looking Great!

    Mike

    Thanks for the kind words.
    The turn fin bracket won't be a problem. I'll just copy the full size ones. Sort of.
    Sounds like you've got some fun in store with that printer.
    As for the motor?
    Well the paint shop & the engineering shop at Wet Track Racing have been busy.
    The motor is ready & awaiting transport to the dyno shop.

    It all went together effortlessly. A great little kit from 3dparts.

    A few bits painted.

    002.jpg

    Start of the assembly.

    003.jpg

    All done.

    005.jpg

    Another view.

    006.jpg
    Last edited by 785boats; 02-14-2018 at 03:00 PM.

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