Tail plane in ground effect during rotation.
OK i've done a pprune and google search and couldn't find anything (which surprised me!).
I fly the B737 Classic and NG.
Whenever I'm in the simulator, during the take-off rotation I have the contol column displaced a certain amount to achieve a certain rate of rotation. Then, just as the main wheels are leaving the ground at around 10 degrees nose up, there is a prounounced reduction in rotation rate to the point where it virtually stops rotating. At this point only an extra yank backwards on the control column, re-establishes the original rate of rotation.
In the real aeroplane, the same characteristics are there but it is not nearly as severe as that. Obviously the simulator is over doing this characteristic a bit.
Anyway I'm wondering what it is that causes this characteristic. My guess is it has something to do with the tailplane and ground effect. Just as there is an increase in lift for an airfoil producing upward force when very close to the ground, there might be a reduction in "lift" from an airfoil producing downward force when very close to the ground.
i.e. The low pressure over the tailplane is actually underneath, between the tailplane and the ground, and this close proximity to the ground restricts the upwash and therefore reduces the downward "lift".
Does this sound right?
Is there anything on the internet you can refer to?
Thankyou.