TAIL CURVE
Helicopters without a heading hold
gyro will experience inconsistent tail
performance. When throttle is applied,
the tail will swing one way and then
another with reduced power. Tail curves
are used to compensate for torque at
various points in the throttle range. Tail
curves are commonly tied to flight modes
and tuned to match each mode after the
pitch and throttle curves are set. The
tail curve mix is not required with most
modern helicopter flight control systems.