Gig 601XL Builder wrote in
:

Highflyer wrote:
"cavelamb himself" wrote in message
...
All it takes is a little collar on the pitot tube (and a bit of
tweaking
the position)

That is how we calibrate the airspeed indicator to get it reading
with reasonable accuracy. Old CG himself taught me that one. :-)

Of course, nowadays, you have to tweak the GPS also!


Anybody have photos of such a collar? Or able to give a good
description?


Pretty sure there's one in Tony Bengelis' books. But you just take a
collet and slide it over the tube and then experiment by moving it back
and forth until your ASI is doing what you think is right.

Bertie