[转帖]The Torque Roll

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What it is:
Plane "hovers" vertically in place, rotating left around its roll axis.
CAP set-up:
Full 3D throws in elevator and rudder are a must. An aft CG helps a little also. Some flyers will run their CG back to make this maneuver easier without gyros. But gyros provide the best aid to stabilize the aircraft- they won't do the maneuver for you, but they'll help. The pros will also tell you to add 3/4 degree of upthrust to your engine. This helps keep your CAP from falling forward in the Torque Roll, and it'll fly straighter uplines in non-3D maneuvers, too.
With a little aft CG, gyros and upthrust, you'll find your plane will be set-up best so you can concentrate on attitude recognition. Naturally, you'll need lots of power for this one: A Saito 150 is fine when propped with an APC 16x8. Heli 30% fuel is also a good option.
How to do it:
Fly low along the ground at low throttle, and gently add power with up elevator to bring the plane into a vertical position. Some flyers add a little left aileron to get the roll motion started. Add throttle to keep the nose pointed up and make corrections with rudder and elevator to keep things straight.
Trickiest part:
Recognizing your correction when the plane's belly is toward you. (Tip: Think push the rudder toward the low wing when the belly is toward you.) You have to be fast with throttle corrections. Most flyers add "bursts" of power, along with rudder/elevator corrections. If you simply hold full throttle, you'll climb out of the maneuver.
Recovery:
Fly out at full throttle.
Worst way to mess up:
An unreliable engine. Torque rolls are tough on engines because they're running at near-peak power with only prop-induced airflow over the head. Some flyers open up the CAP's lower exhaust hole for adequate cooling on hot days.

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