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Anyone Motorize a Kayak or Boat?

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  #1  
Old 09-10-2011, 05:58 AM
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Default Anyone Motorize a Kayak or Boat?

I had an idea to motorize a small personal watercraft with a Pocketbike engine & did some searching. Looks like in Thailand, they build & race these boats.
Long Tail Boat Racing
Check out the videos & share any ideas you might have. I was thinking more along the lines of buying a small kayak at walmart for $239 & using an unsteered longshaft. Steering would be done using the kayak double-ended oar (dipping it in the water to steer the boat towards that side).
-Lowracer-
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Old 09-10-2011, 08:34 AM
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Default Re: Anyone Motorize a Kayak or Boat?

You could also rig a rudder in the back with a wooden handle or with rope pulls. Also no reason you could't set up a pair of pulleys in back to each side of the rudder and rig a small steering wheel or forward/back lever to steer with. I think trying to use the Kayak paddle would be cumbersome.
Small boats can go like the wind. Back when I was a kid the big deal wias 8 foot racing prams with either a 7 1/2 or 10 horse outboard on them... that's when Mercury made a reputation for really fast motors. (What they were doing with their Hurricane models was boring out the engine so the 7 1/2 was actually 15 and the 10 was a 20... wonder why they won!) The Mercs were green then and not black. I wanted one so badly... So now it's pocket bike motors on a kayak... ha! I'd have wanted that, too. Boys and speed go together like peanut butter & jelly.
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Old 09-10-2011, 09:02 AM
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Default Re: Anyone Motorize a Kayak or Boat?

Well, since this is a motorized bicycle site....I always wanted to motorize one of these:

SHUTTLE BIKE KIT - The Official Website
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Old 09-10-2011, 10:43 AM
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Default Re: Anyone Motorize a Kayak or Boat?

You could basically do the same thing I did with this weed whacker. http://motorbicycling.com/f28/weed-w...ild-33215.html

There are a bunch of duck hunters who've built small boat motors this way. I'm helping a guy who is going to build a 52cc pocket bike motor for his boat.

Erich
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Old 09-10-2011, 11:29 AM
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Default Re: Anyone Motorize a Kayak or Boat?

Excellent, Erich.
Thanks for sharing that. I've been thinking about putting an electric trolling motor on a paddle boat, but like the idea of the weed whacker much better as then there is no heavy battery to weight things down and recharge. The gas motor would give excellent range. I'm wondering how it would work to do away with the muffler and run the exhaust under water as you would with an outboard motor. I would think it would provide the back pressure needed for a two stroke and also greatly quiet down the motor. Or am I thinking too far out of the box? Always thought it would be fun to do a little fishing from a paddle boat and have the seat next to me for the dog to go along. Fun! And no pedaling... The motor and shaft could be fixed into position so no tiller would be needed. On a paddle boat there is a rudder with a forward/backward lever/handle to steer with. Could have a lawn mower type of throttle control and kill switch. next to the steering lever. Something else to think about in the middle of the night... dreamin' & scheme'in.You, sir, are contributing to the delinquency of an elder!
SB
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Old 09-10-2011, 11:48 AM
Erich_870 Erich_870 is offline
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Default Re: Anyone Motorize a Kayak or Boat?

Quote:
Originally Posted by silverbear View Post
Excellent, Erich.
Thanks for sharing that. I've been thinking about putting an electric trolling motor on a paddle boat, but like the idea of the weed whacker much better as then there is no heavy battery to weight things down and recharge. The gas motor would give excellent range. I'm wondering how it would work to do away with the muffler and run the exhaust under water as you would with an outboard motor. I would think it would provide the back pressure needed for a two stroke and also greatly quiet down the motor. Or am I thinking too far out of the box? Always thought it would be fun to do a little fishing from a paddle boat and have the seat next to me for the dog to go along. Fun! And no pedaling... The motor and shaft could be fixed into position so no tiller would be needed. On a paddle boat there is a rudder with a forward/backward lever/handle to steer with. Could have a lawn mower type of throttle control and kill switch. next to the steering lever. Something else to think about in the middle of the night... dreamin' & scheme'in.You, sir, are contributing to the delinquency of an elder!
SB
Yep all your ideas would work. I'd put a small hole in the exhaust above the waterline so that water isn't sucked up into the engine once it's hot and you shut if off.

I agree 100% with your realization that a trolling motor plus battery is super heavy for a small boat. That's the exact reason I went with the weed whacker.

Erich
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Old 09-10-2011, 12:45 PM
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Default Re: Anyone Motorize a Kayak or Boat?

I think it would probably work better than the brainstorm I was having about a gasoline powered cell phone.
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Old 09-10-2011, 02:03 PM
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Default Re: Anyone Motorize a Kayak or Boat?

Biknut,
Have you seen the Nissan Leaf commercial they over-played during the Tour De France?
Everything running on gas...lol
Erich, That is good stuff you posted...Thanks
Did anyone watch the videos on the link I posted?
Those little ones are Bad***...
-Lowracer-
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Old 09-10-2011, 02:22 PM
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Default Re: Anyone Motorize a Kayak or Boat?

those little boats are crazy fast.

I'd be worried about flipping over in a kayak with a steerable engine, fixed w/rudder would be the way to go, eh?

I wonder if you could put the trimmer shaft onto a larger engine?
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Old 09-10-2011, 03:51 PM
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Default Re: Anyone Motorize a Kayak or Boat?

Check out this video on Top Gear where the jet Kayak races the 4 wheeler tomcat.
Top gear Tomcat vs jet propelled kayak - YouTube
-Lowracer-
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