verifying airspeed indicator

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

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?
Heino

What sort of ASI do you have?

Have you looked to see if this is addressed in the manual?

For what range of speeds do you want to check/calibrate it?

In the air you can check it vs GPS.

--

FF

GPS will show groundspeed only, so it would only be accurate in ZERO
wind conditions. However, I've read that you can compensate for wind by
flying N, S, E and W by using a compass for pointing your plane. You
point the nose in each direction and do NOT correct for wind drift (and
do not use the track readout on your GPS). In other words, you point
the nose for 90 degrees, even if your GROUND TRACK may be 98 degrees
because of wind. Take the 4 readings you get and average them. This
should get you in the ballpark.

Scott


wrote:
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?
Heino



In the air you can check it vs GPS.

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

I don't think testing against GPS makes sense at all, as the ASI will
surely work properly if indicating wrong ground speed at headwind - so
what information do you gain ?

Kublai

I do not know but if you found the answer please tell me.
regards

I am ehsan ashrafi,student of aerospace eng.I would like to share my
experiences with you
where do you live and what is your course
regards