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View Full Version : Outside air temp effect on static rpm



Monocock
02-12-2011, 10:12 AM
If a 912 and prop combination is set up to run static rpm at 5200 when the OAT is 10 degrees C (50 F), roughly what will the static rise to (with untouched pitch settings on the prop) when temps reach 25 degrees C (80F) in a few months time?

Just curious.

Dave S
02-12-2011, 01:51 PM
Jonathan,

You are considering a 30 degree F temp change - honestly I don't think it will even register on the tach. Summer to winter here the temp varies 80-100 degrees F and I don't see any observable differences that matter.

Sincerely,

Dave S.
KF7 Trigear
192 ULS Warp Tapered tip

Dorsal
02-12-2011, 03:13 PM
I have the same experience as Dave, no meaningful change.

Av8r3400
02-12-2011, 08:45 PM
Food for thought:

Winter, cold - Air is more dense therefore more power from the engine, but the dense air is more of a "bite" for the prop.

Summer, heat - Air is less dense and less power, but the thinner air is less of a "bite" for the prop.


Conclusion: I'd think the static (or what ever rpm at a given throttle setting) would be very similar...