clare wrote:
On 23 Jul 2006 21:21:19 -0700, "abripl"
wrote:

One known problem is that aircraft engines turn CCW looking at the prop
but auto alternators have cooling fins optimized for CW. But thats not
apparently as much a problem as the pulley nut potentially comming
loose. For CW rotation the engine torque will tend to tighten the
pulley nut but for CCW it will tend to loosen it. It happened to me
today )on the ground) after 60 hours of use and the alternator was not
charging just spinning the pulley. Make sure you check your pulley nut
tightness ocassionally if you are using an auto alternator.


Are you telling me that all the aircraft versions of alternators have
left hand threads? Or even that alternators on engines that run
"backwards" or have the alternator on the back of the engine(like on a
Renault R12) have left hand threaded rotors?
I'm afraid I'd have to dissagree. Not ALL do. Perhaps SOME.
On counter-rotating marine engines, both alternators are the same.

--
Posted via a free Usenet account from http://www.teranews.com

They're all right-hand thread, even when used on a Lycoming and
turning "backwards." The fan has straight fins rather than the angled
fins found on some auto alternators.
I ran an alternator backwards on my inboard boat for years,
since there was no room alongside the engine for it and it had to go
out front and sit backwards and therefore turn the "wrong" way. The
thread never came loose, and the fan had straight fins that I got off
some alternator in the junkyard. Some cars had them that way.

Dan