Often modelers of rubber powered free flight airplanes try to get the maximum
amount of turns into the rubber strand motor but at the risk of breaking the rubber.
By using a torque meter modelers can determine how close their motor is likely to
A small rubber test motor of the same rubber stock is prepared the same as the
real motor and wound up until it breaks. All this time the meter is used to determine
at what torque point the rubber got to before bursting. When the real motor is wound
up the modeler now knows how close it can come to the breaking limit.
This meter works by twisting a metal wire that runs the entire length of the
meter. One end of the wire is securely fixed to the tube. This tube has a dial on
one end and as the inner wire twists the indication needle moves along the dial.
This meter was made with rolled brown construction paper, .047” music wire, solder
and wire, and foam board for the dial.
Torque Meter for winding
An excellent book to learn the intricacies of rubber models