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Old 01-15-2021, 04:52 AM
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ahdofu
 
Join Date: Jul 2003
Location: Bellevue, WA
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Default Question on outside air temp effect on glow engine peak RPM

Do you see a change in the peak RPM of a glow engine in cold vs. warm days? In summer time this particular engine of mine was peaking at 9400 RPM (OAT ~ 75 degs). Yesterday it reached 8900 RPM at OAT of 50 degs. On one hand the higher density of air affects the power needs of the prop but then the higher air density should also help the motor as well. Anyway I was wondering what folks have experienced. BTW this is an OS Surpass 91P glow engine using a MA 14x6 prop with Omega 18/15 fuel.