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OK, I know this is off subject, but it IS on a
rotary-powered RV-6.
My static system pressure is off to the tune of 100 feet at
cruise speeds.
Every airspeed indicator I tried (2) read 10 mph too high when
calibrated using GPS triangulation. One day I glanced at
my altimeter while making a cruise speed pass down our home runway
(close to the surface) and noticed that it read 100 ft higher than
at rest. My calculations show that would also account for the
+10 mph on the ASI.
I have the standard hollow pop rivets at the standard Van's
locations. Can't imagine that the small rise on this rivet
would drop the pressure that much! I have asked other RVs to
also do this test, and they come in anywhere from 50 to 80 ft.
high. I tried pulling the static line to let the instruments
use cockpit pressure (which I already knew was lower than static)
and the altimeter read 850 ft!
With all the brainpower available on this list, surely someone
can suggest a method of attacking this problem. I could just
continue subtracting 10 from my indicated, but that is the easy way
out. I was going to drill out the rivets and use a hole in the
flat skin, but I just can't bring myself to mess up a great paint
job. (Yet)
Ideas?
Bill Eslick
N268BL
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