Yesterday I balanced the carbs and test flew the aircraft. It was beautifully
smooth
in the climb and cruise. I could initiate the noise by reducing the throttle
setting to below 25inches MFP, but everything returned to normal at cruise
power. Until I descended to join the circuit, when the noise became apparent
at cruise setting after descending to the circuit height of 1000 ft. It was not
as bad as previously as I could smooth it out by slightly increasing power
and it disappeared when selecting Climb pitch on the downwind leg. Overall a
great
improvement.
I was very interested in Mike Toft's experience which seem very similar to mine
and although I have not ruled anything out everything seems to be pointing to
carburation. I think I will do the same as Mike and see what happens.
--------
Gordon Grant
G-BWFH
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