</font><blockquote><font size="1" face="Verdana, Arial, Helvetica">quote:</font><hr /><font size="2" face="Verdana, Arial, Helvetica">Comanche uses sensors in the blades to read the dynamic pressure continiously. A computer sorts out the phase and rpm effects, and leaves the airspeed data and azimuth as a very accurate result. The blade sensors are used on Comanche because all the other systems contribute too much radar return. </font><hr /></blockquote><font size="2" face="Verdana, Arial, Helvetica">I had heard about that, very , uh .. Kewl !