Simviation Forum - prop feather?

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prop feather? (Read 711 times)

Jan 17^th, 2010 at 5:40pm

jlab58 Offline
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i flew the DC3 today and i notice these prop feather levers that i never used. what are they for? thanks.

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Reply #1 - Jan 17^th, 2010 at 5:53pm

expat Offline
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Feathering a propeller is used (mainly) when you have an inflight engine shut down, though many modern aircraft with props will auto feather at shut down in the air and on the ground. The propeller blades are then turned edge on to the on coming airflow. This is done for a couple of reasons. If a propeller windmills in flight, then the engine or gearbox will still be turning, and after all for what ever reason you have just stopped your engine. You may then have lubrication problems and over heat and fire. A second important reason, is drag. A wind-milling propeller will cause a negative thrust. Someone else could maybe explain it better, but the one thing to know about propellers is, you could study the dam things for 20 years and still have no idea about them Grin

Matt

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B1 Boeing 737-800 and Dash8 Q-400

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Reply #2 - Jan 17^th, 2010 at 6:06pm

jlab58 Offline
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so, it's use to stop an unwanted action of the wind on a non fonctionning prop. that's clear... does that mean if i park my plane outside that i should use it to protect the prop.

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Reply #3 - Jan 17^th, 2010 at 7:29pm

expat Offline
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jlab58 wrote on Jan 17^th, 2010 at 6:06pm:

so, it's use to stop an unwanted action of the wind on a non fonctionning prop. that's clear... does that mean if i park my plane outside that i should use it to protect the prop.

No, if the wind is strong enough to turn the prop, then you have greater problems.....like finding your aircraft in the next field Grin

Saying that, as a rule turbo props will feather automatically on shut down on the ground. You need to ask further about piston aircraft, I have not worked on them.

Matt

PETA People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400

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Reply #4 - Jan 18^th, 2010 at 2:28am

garryrussell Offline
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The older turbo props don't auto feather on shutdown.

There are more that don't then those that do Wink

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Reply #5 - Jan 18^th, 2010 at 3:27am

Fozzer Offline
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Hereford. England. EGBS.

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For anyone using Aircraft fitted with Variable pitch, Constant speed, Feathering propellers, etc, this makes essential reading...>>>

http://www.thaitechnics.com/propeller/prop_control.html

The system is used on some piston engines, but more often on Turbo-prop, turbine engines (P&W PT6 etc).

Independent Propeller and Throttle Controls are often used.
Improper use of the Propeller controls can seriously damage an engine.
A careful study of the Aircraft Owners Handbook is highly recommended BEFORE using Aircraft fitted with this system of Propeller control.

It also makes interesting/educational reading!

Paul...G-BPLF...FS 2004...FS Nav... Cool

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Reply #6 - Mar 13^th, 2010 at 12:48pm

DenisH Offline
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ca, usa

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Brett: I've read your's and other tutorials on prop control and I have the impression the control's chief function is to increase the prop's "bite" while reducing rpm's? Is this an over simplification? I realize these are not the sole functions.

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Reply #7 - Mar 13^th, 2010 at 3:13pm