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  • sbartels commented on makjosher's instructable Rocket Boat1 month ago
    Rocket Boat

    Just thought an adjustable trimming tabs at the end of the main hull might achieve a similar effect

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  • sbartels commented on makjosher's instructable Rocket Boat1 month ago
    Rocket Boat

    Liked your boat very much. The unpredictability is part of the fun, obviously. My advice would be to angle the tube that holds the rocket engines downwards (Maybe just lift the back end a bit) until the thrust force of the rocket goes through the CG of the boat, not above it as it now does. How much angle is neede will be a matter of experimentation, but if you put a hinge on the tube's front end and use different wedges at the back, you could try out lots of configurations pretty easily. Good luck! I think the speed was impressive, and the pictures are great!

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  • sbartels commented on StephanP1's instructable A boat from a single 2x410 months ago
    A boat from a single 2x4

    StephanP1 , congratulations on finishing this project. I loved the way you painstakingly assembled the frames and laminated the stringers. Covering the boat with a tarp is no bad idea, as others said, a coracle or a curragh works the same way. Google for Platt Monforts Geodesic Airolite designs, they build frames like you did and cover them with Dacron cloth. Try that! Durable, light, watertight. You noticed the design flaws - many of which could scarcely be avoided due to the design restrictions. Too narrow, CG too high. And the rounded bottom did not help the initial stability at all. Try a flat-bottomed design, like some kayaks or punts or even the shovel-nosed canoe you find here on instructables. Sit on the floor or at least closer to it (good idea to have that foam mat to spread...see more »StephanP1 , congratulations on finishing this project. I loved the way you painstakingly assembled the frames and laminated the stringers. Covering the boat with a tarp is no bad idea, as others said, a coracle or a curragh works the same way. Google for Platt Monforts Geodesic Airolite designs, they build frames like you did and cover them with Dacron cloth. Try that! Durable, light, watertight. You noticed the design flaws - many of which could scarcely be avoided due to the design restrictions. Too narrow, CG too high. And the rounded bottom did not help the initial stability at all. Try a flat-bottomed design, like some kayaks or punts or even the shovel-nosed canoe you find here on instructables. Sit on the floor or at least closer to it (good idea to have that foam mat to spread the pressure!). Hard chines on a flat bottom should help with tracking and steering, too. You might use a double paddle, too. I am sure your next effort in this direction will be a perfectly practicable, light, easy to carry boat. Please build another one!!! And I loved that little dog that tried to bite the paddle.So go on, build. I have had the wood lying around for a decade and haven't started yet...

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