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01-09-2013 | 08:50 AM

#522

Pete Bergstrom

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Joined: Apr 2002

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From: Champaign, IL

RE: New Evolution 10cc gas engine

Quote:

ORIGINAL: AA5BY

Some prop experimenting will be in order after the break in. Will try to locate the suggested 12.25 x 3.75 but I'm wondering if this engine indeed does have a wide power band that goes lower rpms than typical to glow, I'd like to keep rpms on the lower side to reduce noise. Did I recall one of HH guys commenting that after break in it, it could be loaded a bit heavier to reduce rpms while still making good power and not overheating?

I actually bought a 14x4 funfly prop with the expectation of shortening it to around a 13x4 if it loads too heavy.

The engine will readily swing a 13 x 6 or a 13 x 8 prop after break-in. The 14 x 4 prop might be a viable option but i expect the rpms will be 8800-9200 which is a little bit on the low side with only 4" of pitch.

Pete
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