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Author Topic: weedeater motor  (Read 1390 times)

hopeitfloats

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weedeater motor
« on: December 10, 2010, 05:39:32 am »
would any members have an idea of what size 2 blade prop a petrol weedeater motor would run. i think it is about 20cc , 7000RPM but on a 7:1 reduction.
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Bill D203

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Re: weedeater motor
« Reply #1 on: December 12, 2010, 04:28:55 pm »
Quote from: hopeitfloats on December 10, 2010, 05:39:32 am
would any members have an idea of what size 2 blade prop a petrol weedeater motor would run. i think it is about 20cc , 7000RPM but on a 7:1 reduction.
[/quote
Try starting at a 68 mm prop then you may go up to 74mm. your motor needs to be able to rev at thr top end so don't overload it.
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hopeitfloats

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Re: weedeater motor
« Reply #2 on: December 13, 2010, 07:34:48 am »
thank you sir. that gives me a starting point :-))
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nick_75au

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Re: weedeater motor
« Reply #3 on: December 13, 2010, 10:25:21 am »
7:1 Reduction ?
You could run that in a big scale boat with a 130 mm scale prop with no hassles at all (it would handle even more!), Bills suggestion would be for surface direct drive I would think.

Nick
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