- Oct 30, 2003
- Givens Predator
- Total Flight Time
- 2400+ in rotorcraft
I find clients often stab at the cyclic when they encounter rough air.Vance, I imagine that a forward pulse on the stick actually could set off a PPO sequence in a vulnerable gyro -- one with a high thrustline and inadequate H-stab. A gyro with this kind of layout is a loaded mousetrap, waiting to spring.
A low-mounted H-stab, out of the propwash and with no incidence, will slow or even stop the PPO process -- even if the gyro has a small amount of HTL.
However, IMHO, it's even better to set the H-stab and/or prop thrustline so that the nose rises (stick fixed) when rotor thrust goes to zero. By being immersed partially or completely in the propwash, the H-stab will do this work even at zero airspeed -- at least it will when power is up, which is when it matters.
In terms of Mike G's curves, such a gyro would show a recovery of RRPM and G-load with the stick locked.
One of my demonstrations to show them the futility of this is to take the controls and move the cyclic rapidly in a four inch circle.
It appears to me there is no effect other than the rotor slowing down a little.
I typically stop after two revolutions of the cyclic.
As I watch the video it appears to me that the accident pilot’s stabbing at the cyclic had little if any effect.
I defer to your knowledge and judgment.
I feel the best response in a gyroplane with a high thrust line in relation to the center of gravity when the response is not what I had hoped for is to pull the power to idle.
The high thrust line gyroplanes I have flown all pitched up when power was removed.
Most have a significant yaw when thrust is removed.
If there is no thrust I feel the thrust line in relation to the center of gravity becomes less important.