"Barry" wrote in message
...
A flying club I used to belong to had a "policy" (not a rule, just a
suggestion that it would be nice if you did it) of turning the prop
vertical
after parking it to keep the birds from sitting on it and pooing on the
plane.

We turn the prop vertical in the winter to prevent water from pooling
inside
the spinner and then freezing into a block of ice. This happened to me
once,
and the vibration it caused was impressive. We shut down, pulled the
plane
into a heated hangar, turned the prop vertical, and waited for the ice to
melt
and drain out.


Interesting, and worth remembering.

There is also a much older version of the advise--recommending that wooden
props be left horizontal when parked for long periods so that moisture in
the wood will not migrate to one blade, causing an imbalance.

Peter