Decathalon Prop Operation.

[aalexander]

Hi,

My question stems from a discussion on another forum. One person made the statement that the Super Decathalon POH says that in the event of loss of propeller control, the prop defaults to a low RPM position. I'ts my understanding that most props installed on recip singles will go to low pitch/high RPM if oil pressure is lost.

So, what's going on here?

Is the Prop on a Decathalon a different type of prop, which is spring loaded to go to high pitch/low RPM (similar to a feathering prop on a twin) ?


Is the prop just like any other prop on a piston single, but the Governor control is spring loaded to go to a low RPM position if the control cable breaks?

Is this something which has been taken out of context?



Finally, what exactly does the Super Decathalon POH say about loss of prop control? I'd be interested to see a verbatim quote.


Thanks for any response.

 

[rareblair]

This is true of aerobatic props. If you loose oil pressure they go to high pitch/low RPM to keep the engine from overspeeding during aerobatics. They operate just opposite of props on non-aerobatic engines.

Blair

 

[aalexander]

This is true of aerobatic props. If you loose oil pressure they go to high pitch/low RPM to keep the engine from overspeeding during aerobatics. They operate just opposite of props on non-aerobatic engines.

Blair

Thanks very much Blair. I wasn't aware of this, but it makes sense. It also fits withthe manual.