# Is there a formula to compute the elevator angle to stabilize takeoff?

I'm building a ground effect vehicle, but I'm failing to stabilize the lift-off. At a certain speed, the lift force is equal to the weight force, so the vehicle lifts off. But this implements a change in angle of attack, so also an uncontrolled change in lift, as can be seen in this video.

I know that I can solve this with an elevator that can oppose the change in angle of attack. Now I'm searching for an equation to calculate the elevator angle to get a stabile and controllable lift off.

• I think your problem lies in the CoM placement compared to where the CoL is, each time you get off the ground the vehicle pitches back dramatically and stalls (or that is just the drag of the tail section) – ratchet freak Nov 9 '14 at 15:00
• I would approach this problem a little differently. Think about calculating the amount of lift that the elevator is producing given its angle and speed, and go from there. – Keegan Nov 9 '14 at 21:21