Myth: 1 G barrel rolls are impossible.

Dudley Henriques wrote:
Matt Whiting wrote:
Dudley Henriques wrote:

There is a special case where you can unload the airplane in roll to
increase the roll rate. It's done in fighters all the time in ACM.
You can experience it in your everyday light aerobatic airplane by
doing an aileron roll from a nose high roll set position, then as the
airplane goes past the first knife edge position, go forward on the
pole to unload the wings but not enough to go negative. Keeping the
aileron in hard while you do this increases the roll rate and as a
side effect flattens the roll in pitch at the same time making it
prettier :-)

Why does this work?

Matt

Several factors effect roll rate, roll acceleration and roll inertia.
Basically why this works is that unloading the airplane while rolling
(aileron roll basically, not a slow roll) minimizes much of the
effectiveness issues experienced by the ailerons especially at low
airspeeds and high load factors when the wings are generating a fair
amount of lift. Anytime you want to maximize the roll rate, unloading
will achieve this. The exact point where the rate is maximized by
unloading will vary from aircraft to aircraft but basically the rule
still applies.
Dudley Henriques

Thanks!