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Propeller position after engine stop

I noticed along the years that the propeller does not stop randomly.

Initially, the propeller position after engine stop was like this:

After propeller governor overhaul, it became like this:

Since the recent propeller overhaul, we are back to first position.

Is there any explication to this ?

I think the prop guys just mounted it differently. The position in the second pic (with the blade pointing down) is definitely not good, as the blade will get in the way if you have to use a towbar.

How many cylinders is the engine?

Administrator
Shoreham EGKA, United Kingdom

IO540 has six cylinders… but I don’t understand the clue :-)

Last Edited by PetitCessnaVoyageur at 15 Apr 07:05

I have to turn my 3 blade prop in order to get the tow bar on, so I notice it. (IO-540). It stops in different places each time.

EGKL

PetitCessnaVoyageur wrote:

Is there any explication to this ?

Simple: the prop and be “clocked” in one of two positions.

BTW: Although the Mx Manual makes no mention of it, some mechanics swear that clocking it one way or the other is preferable

FAA A&P/IA
LFPN

carlmeek wrote:

It stops in different places each time.

That’s different from my experience. Between propeller / governor work, it has always stopped in the same position.

Michael wrote:

be “clocked” in one of two positions.

What does mean “clocking the prop” ?
Michael, as Peter suggested, is there a link with number of cylinders ?

PetitCessnaVoyageur wrote:

What does mean “clocking the prop” ?

It’s also called “indexing” – here’s a Beech Mx manual page on the subject.

Last Edited by Michael at 15 Apr 09:50
FAA A&P/IA
LFPN

For the owners of Armstrong starters, getting indexing right is important.

Enstone (EGTN), Oxford (EGTK)

It’s also called “indexing”

That diagram appears to show 2 things:

  • there are two dowel pins which give you just two angular options for attaching the prop, and
  • it appears to require the prop to be in a specific one of the two orientations – does anyone know the exact reason why?

Administrator
Shoreham EGKA, United Kingdom
15 Posts
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