Has anyone ever heard this before?
In thirteen BFR's and five trips to the safety course I don't ever recall anyone mentioning (nor have I ever thought of it) lowering the collectve or pushing right pedal during low-G recovery,...just gentle aft cyclic.
Its from a very long article about Robby's mast bumping issue.
Until you mentioned it, I was not aware of that technique. My best guess is that, in theory, adding right pedal reduces the rate of roll by decreasing T/R thrust and reducing collective (torque) keeps the aircraft in trim. Based on a previous experience, I do not see this being practical.
I have only encountered a low-g induced roll once, and it was inadvertantly. I was flying an R44 at max cruise speed and hit a massive updraft; almost immediately the helicopter banked hard to the right (I would estimate 70-80 degrees). On impulse, I applied a slight amount of aft cyclic and the helicopter immediately returned to level flight. Start to finish the entire event lasted 3-4 seconds. I did not have time to think about the corrective action; I applied aft cyclic because I was surprised and was conditioned to slow down when something goes amiss while flying fast. It was purely instict.
Because a low-g roll can be catostophic in semi-rigid helicopters (mast bumping), it is not a maneuver that can be safley practiced (atleast in my personal opinion). Expecting a pilot to reduce collective and apply right pedal, without the muscle memory from repeated practice, is not realistic.
The best solution is to keep the recovery as simple as possible; aft cyclic. From the past experience mentioned above, I know that aft cyclic will work. No sense in re-inventing the wheel. Discuss it in detail on the ground (cause, effect, recovery and most importantly, prevention). But keep the recovery technique as simple as possible.
Edited by Hand_Grenade_Pilot, 21 April 2018 - 21:31.