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Propeller Indexing

  • William Stilley
15 Oct 2020 17:56 #1 by William Stilley
Replied by William Stilley on topic Propeller Indexing
Bring the engine to top dead center on any cylinder, mount the prop blades 30 degrees clockwise from vertical.

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02 Oct 2020 16:51 #2 by Matt Gunsch
Replied by Matt Gunsch on topic Propeller Indexing
Larry must have one of those Aussie boomerang props
A&P, IA, PPSEL
too many years GA and Warbird Maint
Check out the Ercoupe Discussion group on facebook

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02 Oct 2020 12:56 #3 by Larry Snyder
Replied by Larry Snyder on topic Propeller Indexing
No, I was thinking of the DeLorean powered Ercoupe, where it gets to 6 before 4...

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02 Oct 2020 12:55 #4 by Michael Hainen
Replied by Michael Hainen on topic Propeller Indexing
Do you have a digital watch Mr. Snyder? Or a badly bent propeller? Just kidding!!! Maybe daylight savings time thing going on here.

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30 Sep 2020 16:57 #5 by Larry Snyder
Replied by Larry Snyder on topic Propeller Indexing
I guess you don’t want it at 10-4 at TDC. You want it to start the compression stroke. I haven’t actually noticed when the impulse coupling clicks. All I can say is the position should make hand propping easy. That same position causes the least vibration. When the prop stops when you shut down it should be at 10-4. I was wrong when I said TDC. That could well be 1-7 when the impulse coupling fires. Sorry.

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  • Jon Reese
  • Topic Author
30 Sep 2020 16:25 #6 by Jon Reese
Replied by Jon Reese on topic Propeller Indexing
Larry I read the article and it is saying -

The correct procedure to check the clocking is to rotate the
engine by hand until you hear the impulse coupling on the
mag “click”. The engine will now be on top dead center. If
the prop’s clocking is correct, while looking from the front,
the blades should now be between 1 & 2 o’clock and 7 & 8
o’clock.

Is the 10/4 as you see it from the cockpit?

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