PropVario is a combination variometer and altimeter for Radio Controlled sailplanes ... usually called a rate of climb or vertical speed indicator. R/C pilots don’t have the luxury of looking ...

Indicator, Compass, Gyro, Flux Gate, Cutaway National Air and Space Museum Altimeter, Cutaway National Air and Space Museum Control Unit, Autopilot, A-4, Cutaway National Air and Space Museum Valve, ...