- May 13, 2014
- Vortex M912, SportCopterII, Vortex 582
Hmmm, we'll have to disagree on that.In the Sportcopter video, the forward acceleration phase has disappeared, due to the headwind.
Only the phase of takeoff with an angle of attack increasing, instead of standard takeoff with a angle of attack decreasing.
The headwind that day was about 6G10kts, not even 15 kts, and not even the rough field take-off AS to "disappear" the forward acceleration phase.
Our flexshaft prerotator can not only spin up to flight RRPM, but do so while ending at any amount of aft stick. In our experience with our machines, this can shorten take-off distance for a competent pilot, headwind or not. Gyros using a U-jointed driveshafts prerotator do not well lend themselves to that technique, because it's hard on the U-joint—thus, they spin to 200 RRPM with a flat disk and then launch while adding aft stick. In our opinion, this lengthens the take-off roll, and invites pilot error. Have you flown both types for yourself to compare?