"Jim Vincent" wrote in message
...
I know what force is and what torque is, but what's ``torque force''?
I see no significant difference in the pitch torque generated by a T
tail and a conventional tail (apart from a minimally longer arm for a T
tail on a given typical glider design).

Am I missing something?

The torque is around the rolling axis, not the pitch axis.

With a conventional tail, the rolling torque is based on the distance from
the
fuselage center line to the CG of the elevator surface. In a T-tail, the
distance is based on the whole length of the vertical fin, so the moment
arm is
greater. Hence, greater torque force.

Jim Vincent

Ever watch a Zuni tail during take off? I gather it's also interesting to
watch in flight, but Zuni drivers don't really like using mirrors;^)

Frank Whiteley