Flying next to a friend in his new-to-him RV-6A (I believe he has an O-320 FP prop), I asked why we were going so damned slow...I was showing 100-110 KIAS, and he was showing 20 knots or greater *higher*. I *know* my airspeed is correct, by comparison with numerous other RVs in formation flights, at all sorts of altitudes and power settings. So this is a problem with his airspeed. But what?
BOTH his mechanical ASI and his D-10A were showing the same IAS. He has just had a pitot/static/XPDR cert done and passed, but I know this won't detect installation error that can only be found in flight.
He performed some stalls in order to find the *indicated* stall speed, for safety of flight on T/O and LDG, and says he stalled at around 65-70 KIAS, clearly way too high.
What could cause this? FWIW, his static ports are flush rivets, but I've only heard of problems with flush rivets causing an IAS that is too *low*, and it's almost impossible to think of an installation error with the *pitot* tube that would make it read that high.
Anyway, looking for troubleshooting advice to help out a buddy...TIA!
BOTH his mechanical ASI and his D-10A were showing the same IAS. He has just had a pitot/static/XPDR cert done and passed, but I know this won't detect installation error that can only be found in flight.
He performed some stalls in order to find the *indicated* stall speed, for safety of flight on T/O and LDG, and says he stalled at around 65-70 KIAS, clearly way too high.
What could cause this? FWIW, his static ports are flush rivets, but I've only heard of problems with flush rivets causing an IAS that is too *low*, and it's almost impossible to think of an installation error with the *pitot* tube that would make it read that high.
Anyway, looking for troubleshooting advice to help out a buddy...TIA!