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20" Kneeler hydroplane

Discussion in 'Boat Build Projects' started by Tombsy, May 31, 2017.

  1. Tombsy

    Tombsy Boat Racing Fanatic
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    This will be the build of a Jerry Dunlop designed "Kneeler style" hydro built around a TFL outboard that is a spare part for Hobby Kings Sprint F3 Tunnel Hull. A couple guys in our club are building these boats as well and it should be a fairly cheap and easy build for a little fun runner.
    The motor set is $70 from Offshore Electrics or Hobbyking and its a 3000kv outrunner that is 2 or 3s capable. The boat is constructed wood over foam, with some of that blue foam board from Home Depot or a left over construction site, some 1/32" and 1/16" ply, and some balsa. I figure the wood list will be about $70 up here. The outboard arrived this week but I'm getting some boats ready for a race this weekend, I'll get wood shopping next week.
    And I was going to take a break from wood boat building for a bit lol.

    [​IMG]

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    Here's some of Jerry's pics of his boats

    [​IMG]

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    [​IMG]
     
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  2. Antho11

    Antho11 Studio Forums Elite
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    The outboards look super scale and the drivers add a nice touch! Did you make those plans?
     
  3. Tombsy

    Tombsy Boat Racing Fanatic
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    No they are from Jerry Dunlop, he's been racing since the 50's and has designed boats for different manufacturers. My friend in the club has known him for years and got the plans printed up. I'll find out where I can get a scan of it. There is a build manual as well. The drivers are just carved out of foam with a plastic egg for a head. :)


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  4. Tombsy

    Tombsy Boat Racing Fanatic
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    I picked up the wood for this build, still need some foam board. But I glued the plans to some poster board and cut them out, then they get traced onto 1/32 and 1/16 ply and cut out.

    [​IMG]


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  5. Tombsy

    Tombsy Boat Racing Fanatic
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    I've got the parts cut out just working on final sanding. I was mistaken on the plans being available for free but the build manual and full size plans are available for a nominal fee from Jerry Dunlop. I still have to scrounge up some blue foam board insulation, I've been checking the dumpsters lol.
    [​IMG]


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  6. Tombsy

    Tombsy Boat Racing Fanatic
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    I finally got a chunk of blue foam so the build begins, it starts with gluing the front sponson parts to the foam and trimming it to shape. Trying hard not to get the left and right parts screwed up lol.
    [​IMG]
    [​IMG]
     
  7. Tombsy

    Tombsy Boat Racing Fanatic
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    Been making progress, front half of the sponsons are done, working on the back parts.[​IMG]


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  8. Tombsy

    Tombsy Boat Racing Fanatic
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    Finished the back half of the sponsons then joined them with the front. Then started on the center section, two more foam pieces get skinned with ply and then bottom sheet is attached.
    I just added the cockpit sides and rounded over piece at the front.
    You can see the final shape it will be[​IMG][​IMG]when the sides get attached.
    I have to work on carving the balsa nose of the cockpit.[​IMG][​IMG][​IMG]


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  9. Polaris425

    Polaris425 Studio Forums Elite
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    where did you get the pattern?
     
  10. Tombsy

    Tombsy Boat Racing Fanatic
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    The plans and build instructions are available from Jerry Dunlop for $30. I believe this email is current: rcboats at earthlink dot net.
    He is also on the International Waters rc boat forum.
     
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  11. Tombsy

    Tombsy Boat Racing Fanatic
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    Some more progress, the cockpit sides were glued in and balsa blocks are glued on to the nose. After a bunch of shaping and sanding it doesn't look to bad. The bottom of the nose got sheeted with ply for a little more protection. Finally the sponsons were attached to the centre section.
    Just working on the ride pads that help lift the transom, they get sheeted with 1/32 ply as well.

    [​IMG][​IMG][​IMG][​IMG][​IMG].



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  12. spawn

    spawn Studio Forums Elite
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    nice looken good
     
  13. Antho11

    Antho11 Studio Forums Elite
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    Awesome work the nose is looking really good!
     
  14. Tombsy

    Tombsy Boat Racing Fanatic
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    Still plugging away laying out the radio box, pass thru's for the motor wires, steering cables, and water lines. Put some threaded inserts in the transom for the motor mount bolts and lots of sanding to get ready for a coat of epoxy inside and out.
    [​IMG][​IMG][​IMG]


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  15. Tombsy

    Tombsy Boat Racing Fanatic
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    A little sidetracked working on too many boats at once :), the radio box and servo mount are in and the boat is sealed with epoxy inside and out. I need to make a piece to fill in front of the radio box and start working on a driver. Then should be ready for paint.[​IMG][​IMG]


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  16. Tombsy

    Tombsy Boat Racing Fanatic
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  17. Tombsy

    Tombsy Boat Racing Fanatic
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    I finally finished up the kneeler, haven't run it yet but my buddy had his going today wow its faster than I was expecting. Should be fun to play around.
    The last detail was a driver, I made his head from a Kinder surprise egg and foam for his body.
    I've got some video of his running I'll post up.
    [​IMG][​IMG][​IMG]
    [​IMG][​IMG][​IMG]


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  18. Tombsy

    Tombsy Boat Racing Fanatic
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    Here's the kneeler in action



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