914 with airmaster prop

by todd linkous in 912 / 914 Technical Questions 3 weeks ago

I have a 914 with a airmaster three blade prop. I have always got engine roughness when bringing the throttle from cruise to idle. Like coming in from downwind to base. Seems to be when there is no load on the motor I get roughness. When the air Master goes to fine pitch. If I override the air master at low RPM it will smooth out. Anyone else with this setup experiences this? Thanks

Re: 914 with airmaster prop

by todd linkous » 3 weeks ago

todd linkous

5 6 8

Also I don't have a slipper clutch in gear box.

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Re: 914 with airmaster prop

by Sean Griffin » 3 weeks ago

Sean Griffin

55 1.44k 6.4k

Not quite the same - I have an Airmaster/912ULS.

I don't like to run withe the choke/enrichment fuel circuit for too long. When I close the choke, the engine will run rough, until getting close to 50C. oil temperature.

I set 2500 RPM for warm up. As the temperature rise & RPM rise above 2500, I use a touch (Manual) of prop pitch to keep it at 2500 - the tiny bit of load seems to smooth out the roughness. 😈

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Re: 914 with airmaster prop

by Sam Purpura » 3 weeks ago

Sam Purpura

11 237 1.33k

How many hours since gear box was serviced. If you have Warpdrive blades they are very sturdy but also heavy so they have lots of inertia on a gearbox.

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914 with airmaster prop

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