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Old Nov 04, 2004, 09:28 PM
Skyshark is offline
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South of Boston, Ma.
Joined Mar 2004
1,277 Posts
6 Foot Long P.T. Boat

Hello all!
Here's the deal. About 20 years ago I built a P.T. Boat from scratch on a dare. Also I was having a problem with a certain harbormaster and was going to take him out from a distance with this thing. Ahh, the dreams of youth!
I designed it to be powered with a chainsaw engine thru a homemade gearbox driving twin screws. The drive is built and installed but I could never get the chainsaw engine to start.
Fast forward to now. I have finally taught myself to fly R/C electric aircraft and enjoy the heck out of this sport! It suddenly dawned on me that with the advances in electric motors and batteries I could get close to the performance I was expecting from the chainsaw engine in the P.T. Boat.
I am toying with the idea of getting rid of the engine and gearbox and going to twin electric motors and twin batteries. I would like to have independent
motor control but am not sure how that would work out TX/RX wise.
I figure a top speed of 30 m.p.h. in up to 1 foot seas was possible with the chansaw engine. With the reduced weight of the electric drives I would not project more than 20 m.p.h. under similar conditions.
I am asking the experts: what do you guys think?? I can give better spec's once I drag the beast out of storage and take some digital pictures. Am I out of my mind? Should I have my dosage adjusted??
Thanks in advance!
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Old Nov 04, 2004, 11:19 PM
martin richards is online now
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Asturias, Spain
Joined Mar 2001
3,576 Posts
First reply from a non expert I'd say it was doable unless it was over-engineered for the original gas engine. You'd maybe want to look at some of the industrial electric motors avalable, e.g. de Walt. I don't think for the sort of use you have in mind nickel based batteries have a lot to offer that lead acid batteries can't supply more cheaply and simply.
Of course you could also think of the mag motors used for battlebots or big Hacker or Lehner or even some of the bigger outrunners and loads of paralleled LiPo packs.
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Old Nov 04, 2004, 11:31 PM
iamplanecrazy2 is offline
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USA, TX, Waxahachie
Joined Aug 2004
381 Posts
I like the chainsaw engine and gearbox. You can't beat the exhaust sound and smell of that burned fuel. Instead of recharging batteries you just have to fill er up with gas and go.
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Old Nov 05, 2004, 08:11 AM
MikDee is offline
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Milford, Pa. USA
Joined Mar 2003
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I'd guess maybe a coupla automotive electric radiator fan motors, or heater fan motors ought to do the trick.
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