Ed Anderson Wrote:


Switched everything off and got out to inspect.  I found the prop

exceeding

difficult to turn over at this point.  There were clearly two
possibilities - gearbox or engine.  I noticed that the normal 3/8" gear

lash

free play at the end of the prop was not there - or rather the prop

could be

moved that distance but it was very stiff and resisting.  So that told

me it

was likely a gear box problem.

Ed

   3/8" or 9mm of gear lash at the end of the prop seems like an awfull lot.
My 2.85 Ross box has settled down at about 5mm. Just returned from 1000 kn
mile round trip. 28 liters / hour one way with ground speed of  140knots at
8500 ft leaned out to 16:1 on unleaded. Including one stop. Other way at
ground speed of 150knots on avgas 25 liters /hr. Leaned closer to 17.
By the way, when its hot on the air strip I cheat the cooling problem by
setting 10% rich for takeoff and climb to 4000ft, usually at close to
1000fpm.
Ian RV6A Australia.

 
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