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Old 02-06-2019, 08:44 PM
FNG FNG is offline
Join Date: Jan 2019
Location: Southern Ca
Posts: 2
Default RPM on takeoff

I just bought a RV-9A. It has an O-320 A2B and three bladed Cato FP prop.

The rpm at 55 knots on takeoff roll is only 2150RPM AT 10*C and 1200 pressure altitude. Is this normal? Iím not certain it is developing full power.

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Old 02-06-2019, 10:02 PM
Michael Burbidge Michael Burbidge is offline
Join Date: May 2006
Location: Sammamish, WA
Posts: 596

Thatís about my Static RPM. Full throttle, brakes holding the plane in place. But I have a 160 HP O320.
Michael Burbidge
Sammamish, WA
RV-9A FlyingĖ265 hours so far!
Last Donation: December 2018
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Old 02-06-2019, 10:08 PM
lr172 lr172 is online now
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,574

Originally Posted by Michael Burbidge View Post
Thatís about my Static RPM. Full throttle, brakes holding the plane in place. But I have a 160 HP O320.
I would expect someting in the neighborhood of 2150 RPM static, but would expect it to be a bit higher at 55 knots. If you cruising at 8000' what is the max RPM WOT and ROP?

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
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Old 02-06-2019, 10:34 PM
PCHunt PCHunt is offline
Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,540

I'm sure Larry meant to specify 8,000' DENSITY ALTITUDE.
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G

2019 Donation+, Gladly Sent
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Old 02-07-2019, 12:53 AM
control control is offline
Join Date: Feb 2006
Location: Stockholm, Sweden
Posts: 609

Fixed pitch is always a compromise. If your take-off performance is good enough then I would not change anything.
RV-14 kit #140138
I have entered the 90% done, 90% left to do zone
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