Calidus crash video?

Doug Riley

Platinum Member
Jan 11, 2004
A gyro can become airborne with lower-than-normal rotor RPM. The blades make up for their lack of airspeed (lack of rotational airspeed, that is) by operating at a higher angle of attack. The retreating blade operates at a higher angle of attack than the advancing blade anyway, and this added angle can be enough to cause a stall to spread from the root of the retreating blade toward the tip.

The FAA's Rotorcraft Flying Manual deals with this situation. It's happened to me, though rarely. Push the stick forward and, if still over the runway, land.

To avoid this situation, be aware of how the rotor feels when it has reached full RPM, and don't try to force the aircraft off the runway prematurely. Leave the runway in a level attitude.