Hi All,
If you recall I posted about a year ago, relating to PV50 and some vibration
problems.
Well, it has been an interesting year, and some stories which I won't
write on a public forum, but I might share over a beer at a fly-in. A lot of the
year has been a learning curve, and I used the time waiting for the PH-Reg
to come through, to experiment and learn more
Today I was coming to the end of a careful adjustments on the propeller, but
still,
alas, there is an imbalance. I'm getting about 0.25 IPS on the prop (attached
is the outcome of the spectrum), this is now the main and seemingly only
contributor to the vibration.
I've managed to get all three blade-pitches to within 0.16 degres across all
three
blades, and the tracking is less than 3 mm. The blades are quite firmly seated
now, after I have installed new plastic blocks. All of this has had no real
effect.
Today was a very quiet day at the airfield. There was only myself and my "plane
work buddy". On one of the blades I heard a "tick", and on closer inspection
it is evident something is loose on the inside (One of the static balance
weights,
I am assuming)
Does anyone have any experience at all in setting the static weights on a PV50
blade? Is it possible without manufacturer support?
Failing that, is there anyone with a spare blade that I could try in the
position,
to close off this investigation?
I know the engine is not contributing, as the latest spectrum shows nothing
significant
at key engine frequencies, and in addition I have spectra from other
measurements with my aircraft and a Warpdrive installed which shows very good
vibration down at 0.08IPS.
Cheers
Jon
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