"F.L. Whiteley" wrote in message ...
"Jim Vincent" wrote in message
...
The drum diameter has nothing to do with the torque!!!

Sure it does. The rope has a certain amount of tension on it, usually
measured
in lbs. The rope is pulled off the drum at a certain distance from the
center
or rotation. That distance is the moment arm. The torque is the tension
X
moment arm, hence inch lbs or ft lbs.


Jim Vincent
N483SZ
illspam

And, in practice, constantly changing, generally increasing, depending on
design and layup.

Frank Whiteley

Definition of Torque:
The Torque on an object about some pivot point is due to the action of
a force on the object. (So, if this is drum of a winch on a shaft I am
assuming)
Magnitude of the Torque:
t = "Force" times the "Lever Arm"
= (Component of the Force perpendicular to Lever Arm) x (Lever Arm -
the distance between the pivotal axis and the point where the force is
applied) = Fp l
= (Force) x (Perpendicular line of action lever arm - the shortest
distance between the pivot point and the line of action of the force
through the body) = F lp
= (Force) x (Lever Arm) x sin(angle between the two) = F l sin(q)


Direction of Torque:

· The more exact definition is that the torque is that the torque is
the cross product of the lever arm with applied force.
· The torque's direction is perpendular to both the direction of the
lever arm and the direction of the force. The direction can be found
using the right hand rule.
I Units: N m
* These are the same units as a Joule, but nobody uses Joules. There
must be some deep connection which nobody has yet discovered. Any
ideas ?

Torque on a Body
A force is applied to an irregular shaped body on a frictionless,
horizontal surface. The location the point of application of the force
can be altered by dragging the application-point. The magnitude and
direction of the applied force can be altered by dragging its tail.
Displayed are the torque, the magnitude and direction of the force,
the lever arm, and the angle between the force and the lever arm. Also
displayed are the perpendicular values of the applied force and the
lever arm.

Just my few thoughts....jk