Low cost air speed indicator.

 Not compensated for temperature or altitude.

 Useful in the back seat of a tandem aircraft without
 a rear instrument panel.

 It is a simple water manometer 20 inches high.


 Paul Lamar


will it work as well with antifreeze liquid? i am thinking of wintertime...
Yvon Cournoyer

It will work but it may be off slightly as antifreeze is slightly
less dense than water. It can be calibrated or recalculated
once one determines the exact density of ant freeze.
The water calculations are based on 65 pounds per cubic foot.

Paul Lamar