Inappropriate rotation technique
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
A rapid rotation can take a wing past its normal stall angle and still have 'attached' flow ie remain unstalled for few seconds. This has been shown in tests, and I am sure helped the Lightning 'rotation' take-offs where flight path rapidly caught up pitch angle.
The big no-no with 'slow' rotations on take-offs in normal a/c is......... - remember the s/e screen height on a wet runway and then rotate slowly? No thanks.
The big no-no with 'slow' rotations on take-offs in normal a/c is......... - remember the s/e screen height on a wet runway and then rotate slowly? No thanks.
Joined: Oct 2006
Posts: 658
Likes: 1
From: Ankh Morpork, DW
hawk37 wrote:
Sure, ground effect increases your lift, so you can get airborne early. However, the final pitch attitude shouldn't be attained until you're already airborne. The wheels will come off around 6-8 degrees on a normal rotation and you'll continue to rotate. Rotate to 15 degrees on the runway in a -900, you'll have some paperwork.
I Clunk says:
"You rotate early, get airborne early (Vmu or "slow") and are at a pitch/airspeed mis-match (ie AOA)".
Would you really get airborne if you don't exceed your computed attitude?
"You rotate early, get airborne early (Vmu or "slow") and are at a pitch/airspeed mis-match (ie AOA)".
Would you really get airborne if you don't exceed your computed attitude?
