On Mon, 17 Oct 2005 07:07:56 -0500, "Heino & Deanne Weisberg"
wrote:

I do not believe my airspeed indicator is accurate. Is there a way to
verify/calibrate an airspeed indicator on the ground?

It might be easier to calibrate in the air (that is unless your
homebuilt is not flying!).

You can determine true airspeed empirically through the use of a GPS
while flying. Specifically, go to the following website, follow the
instructions to capture the data and then use their 'true airspeed
applet' to calculate true airspeed.

http://www.reacomp.com/true_airspeed/

If you note temperature, pressure, you can work backwards to figure
what the indicated airspeed should have been.

-Nathan