Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: Biscuit on January 07, 2017, 08:29:51 pm
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hi all, not been on here for a while, I just thought I share with you a build I been working on over last few weeks, originally this boat was electric but so boring. I managed to find an old Os 40 four stroke that I got up and running and converted it to marine use. Now I wanted to have reverse with the ic engine so made myself a gearbox with a clutch so can tickover in the water without moving and change gear, had to fit a pump to cool the engine when not moving, I have run motor up and gearbox works as does clutch and water cooling just need to give it a run now. I was hoping to post some pics but won't let me :((
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Message sent
Dave
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See: http://www.modelboatmayhem.co.uk/forum/index.php/topic,23.msg579912.html#msg579912
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https://youtu.be/0zJKMfy4XeM
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https://youtu.be/DysRi-V15wM
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https://youtu.be/SNloV5-hlmk
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juxt a few vids of my boat and gearbox
https://youtu.be/OkT9vXn9-uA
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Biscuit that is brilliant, was only talking today with my mate in workshop about how difficult it would be to a put one of my four strokes into a boat, did you use a centrifugal type clutch? How did you water cool the engine?
Really got me keen to try it now. Well done.
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Yes I made the gearbox myself after finding out how they worked, I then made a clutch similar to a model car and hooked it all up. The engine is an old Os 40 aero engine which someone gave to me as a non runner with a broken casing and was seized solid, but after stripping it down I just had to clean it out of old castor and replace the bearings and lap the valves in. I had to make my own cooling ring after turning the fins down a few mm and heat shrinking it on, sounds easy but had 5 attempts to getting it right. I knew I wanted it ticking over in the water so had to rig up a pump to give a constant flow, I bought a car windscreen washer pump but that leaked and was too powerful, I found an old model flight box with a fuel pump and now using that, it is linked up to an esc and mixed with throttle channel so the faster you go the more water is pumped. I have not tried the boat as last time out our flying lake was frozen and this week they got a mud run there so hopping for the week after.
The boat itself I had brushless to start with with sound systems and lights but just had no soul, it's been weathered and believe it's been scratch built, some kind of Vosper I think.
Sorry to bomb the thread with videos but could not get any pics on here, hope it will just plod around and sound nice, will get a vid of it running soon.
Steve
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I have a short vid of my Ic four stroke conversion with reverse gear box, was nice and choppy today.
https://youtu.be/647n-Sk16Uk
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See this thread too:
http://www.modelboatmayhem.co.uk/forum/index.php/topic,16981.msg169372.html#msg169372
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Yes few years old