tips on 40cc chain saw engine prep for 72 mono

Rkiser · 06-29-2009, 03:26 AM

hello,
I am building the mono 72 from plans i got here (thank you) to use with a 40cc chainsaw engine it is a Poulan 40cc Wild Thing Chain Saw Model# P4018WT. i could use some advice on preparing the engine for the boat and also suggestions on building the boat from others that have done a simalar build. thank you
Robert

Rkiser · 06-29-2009, 03:54 AM

also whats the best epoxy to use for 1/4" plywood contruction during the build?

John · 06-29-2009, 07:01 AM

Check that the chainsaw engine rotates the correct way as I recall they go the opposite way for most standard props. From memory looking at the output shaft of the engine it should spin counter-clockwise.

Rkiser · 07-01-2009, 07:07 PM

thanks i will check. if it is the wrong way is there a gear drive to correct?

dwr9 · 07-02-2009, 12:26 AM

You would probably have to fabricate your own gear box if necessary. There is no wrong direction of rotation. A normal marine r/c engine rotates counter clockwise when you are facing the output end of the engine as John stated. There is a much greater selection of props for a normal rotation, but some reverse rotation props are available. Doug

Rkiser · 07-02-2009, 01:50 AM

can you suggest any manufactures or websites for reverse rotation props? and also what size and pitch would you recommended.

dwr9 · 07-02-2009, 05:26 AM

You could try here: Dasboata.com . You will see a few props on there with RH meaning right hand rotation. I have no idea what to suggest. I have no experience with what you are using. There is a link on Dasboata's site to contact him. I would do that and ask his advice. You could also look here: http://www.voodoopropellers.com/ . Vodoo lists a few right hand props. And here is another link: http://www.abcprops.com/ .
Doug

x1601 · 10-27-2009, 12:45 AM

Hello, my friend and I are building a boat witha chainsaw engine. i would be curious to see how you handled the counter rotation situation. Thanks

martinchoj3 · 11-09-2009, 07:49 PM

Hello .. I am of Argentine and am constructing 72 Inch Offshore Monkey but I do not have information about where the engine goes hubicado and demas accessories .. the one who can help me?

dwr9 · 11-09-2009, 11:17 PM

I have never built the boat, so I have to admit I'm not sure, but I would try to get the center of gravity somewhere around 28 to 30% of the length of the boat. That works out to roughly 20 5/32 to 21 5/8 inches from the back of the boat with all hardware, the motor and electronics in the boat.There are an awful lot of variables involved. With a more powerful motor you might need to move the cg forward more and with less power it might need to move back among other things. Doug