Flügerchilbi at LSPL

Our beloved Rhönlerche (Ka 4), HB-757, may not have participated any more this year, but this is the glider I learned to fly on....

Airspeed calibration...

Although there was no flying on this wild Sunday afternoon, some of us started fine tuning our instruments in order to be ready to collect more OLC points. With the help of Rick's scientific setup, quite many feet of instrument tubing, and a little bit of water, we concluded that ZP's airspeed indicator reads 56kts for a dynamic pressure of about 2'' of water, and 96kts for a 6'' water column. It turns out that this is amazingly accurate. The theoretical values are 55.447 and 96.037kts for 2 and 6 inches of water!! ZP certainly won't need a new airspeed indicator....