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Old Jan 02, 2013, 10:18 AM
Registered User
United States, FL, Tampa
Joined May 2012
35 Posts
What would be the better powerplant?

I have a GP P-51: http://www.greatplanes.com/airplanes/gpma1205.html

I have two motors, an OS .60FP two stroke and a Magnum .70 four stroke. Which would be the better powerplant?

Thanks for your input
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Old Jan 02, 2013, 10:36 AM
team sleprock
whiskykid's Avatar
United States, WA, Port Angeles
Joined Dec 2009
3,812 Posts
that 70fs should be perfict in that 51
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Old Jan 02, 2013, 12:29 PM
Goodnight Irene
kenh3497's Avatar
United States, IA, Rockwell
Joined Jul 2011
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Yup, 70 4C is one of the recommended engines. Go for the .70 4C
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Old Jan 02, 2013, 12:32 PM
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United States, NY, Syracuse
Joined Oct 2008
4,176 Posts
I think you'll find they're pretty close. The 60 is rated at 1.6 Hp and the 70 is rated at 1.1 Hp, but 2-stroke power ratings are a bit inflated since they usually run a tiny prop (not much thrust) to get the maximum power. I had one of those 60 FP's and it was plenty for a 6.5 lb plane... the 70 will probably swing a slightly bigger prop at a little lower RPM.

Since the 70 will sound better, I'd go with that.
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