Does anyone know where to get the speed indicator for the Bensen. It is plastic with a hole at the bottom and a ball that rises according to the speed that the air is entering the hole. What are you guys using for speed indicator?
The Dwyer wind meters with white pith ball were always stuck, at least here in Florida with its humidity. The Hall wind meter with red plastic disc works much better.
A propeller type ASI can be quite accurate if the propeller is properly designed but it indicates true airspeed rather than density based airspeed; a propeller is a screw, turning the same number of revolutions/mile whether in air, water or soft snow.
Flying machines don’t care about true airspeed; they perform in accordance with density airspeed.
Oops! I should have said a propeller is a nut rather than a screw.