Thread: Prop position
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Old March 20th 06, 08:22 PM posted to rec.aviation.owning,rec.aviation.piloting
Dave Butler
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Default Prop position
wrote:
I'm pretty sure where the prop stops doesn't measure anything.
How do you know it stopped in the same place "horizontally"
each time? There are at least two possibilities.

Right, unless you can somehow distinguish the two blades.


Why would the prop stop in a preferential position anyway?
Seems like it would be on any one of the 4 compression strokes.

There are 4 cylinders, and each one has a compression stroke every 2 revolutions
of the crankshaft. That makes 2 compression strokes per revolution. The prop
stops in one of two places, which are indistinguishable unless you can somehow
distinguish the two blades.


I'm also convinced that even the differential compression
check doesn't show what you really want to know.
The rings are AC coupled, tho less so in the Lycomings.

What does this mean: "The rings are AC coupled"?


So I'd guess one would need something worse to worry
about. Maybe price of gas or user fees!

Agreed. It's fun to think about, though, and if there's a sudden change in
behavior, I'd want to know what changed.