Armody, Opjose answer is very good so I will leave it at that. I set my engines to run at idle on vertical
downlines so the propeller will add a brake effect.

Another thing to consider about your nosedive not related to engines, you said 1000 feet to 20 feet.
The plane will carry alot of speed from this height and your airframe (wing setup) may not be able to
handle the loads applied to it. Also if you really plan to do dives to this degree you will want metal geared
high torque servos on the elevator that can handle the loads that will be placed on them. at the
speed the plane is travelling and the force applied to the elevator at pull up, there will be a certain amount
of blowback on the control surface. this will cause the plane to pull up alot slower than usual. And
it may actually meet the ground before it has a chance to level out.