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Old 07-18-2018, 11:09 AM
Paul Paul is offline
Join Date: Jan 2005
Location: Kansas City, MO
Posts: 43
Default Constant speed prop or the prop governor

What do you think I should look at 1st ?
Constant speed prop or the prop governor ?
RV-6A with 0-360, Hartzell prop and McCauley governor, both are at 1560 hrs. total time.

Changed the oil, lubed the prop and went flying. Just another day !
Set the climb power to 2400 rpm and 24"mp just like always. But when I got up to 6500 ft and leveled off at cruise there was no prop control at all. As airspeed increased so did the RPM up to about 2550-2600.

Descended to land and had control of the rpm while entering the pattern and landing. Got fuel and took off returning to base about 8 miles south with no problem setting cruise at 1500 ft and 23 squared.

RV-6A Flying Since 2002
"Taylor Maid"
Kansas City, MO

Last edited by Paul : 07-18-2018 at 01:15 PM.
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Old 07-18-2018, 12:38 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,454

It sounds like the coarse pitch stop was somehow changed?
Make a ‘paddle’ from some scrap wood, and measure blade motion from full fine to full coarse, compare to specs.
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Old 07-19-2018, 03:26 AM
Lufthans's Avatar
Lufthans Lufthans is offline
Join Date: Dec 2017
Location: Hilversum, The Netherlands
Posts: 50

Bobs remarks sound plausible. Hope you can find the specs to compare the settings to though.

Prop blades can bind. Just try working with an electrically adjustable prop. They are awful this way. When was the last time your prop was serviced? Does the prop adjust properly with full power on the ground?

Good luck!
Hans Teijgeler
Hilversum, The Netherlands

PH-SUM RV-4; Imported and upgraded.
PH-BRR Bowers Fly Baby; Imported and upgraded
PH-MGA Jodel DR1050; Built, with Subaru EJ25
PH-EIL RV4; Imported and upgraded for friend. Sadly crashed
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Old 07-19-2018, 10:10 AM
rvsxer rvsxer is offline
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 302

You don't need to use a paddle to change the prop pitch. Disconnect the governor oil line at the nose case, make an adapter, and connect shop air to it through a regulator. As you open the regulator valve the blades will move. I think mine took 40 psi to go full pitch. This is also the only way to see if the blades are binding in the hub. The movement should be smooth.
Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
Manager - Panel Design, SteinAir, Inc.
A&P, EAA Tech Counselor

We're all here because we're not all there...
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Old 07-19-2018, 10:23 AM
Paul Paul is offline
Join Date: Jan 2005
Location: Kansas City, MO
Posts: 43

The prop works fine on the ground during run up and in the air at low altitudes.

I only see the issue up higher at cruise airspeeds. No problems with oil pressure and after checking the engine I see no loss of oil.

I always thought the TBO on the prop and governor was 2000 hrs - Totally forgot the (Or 6 years)
Today's plan is to pull the governor and prop and have both of them overhauled.

RV-6A Flying Since 2002
"Taylor Maid"
Kansas City, MO

Last edited by Paul : 07-20-2018 at 07:23 AM.
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