Current practice holds that winding a rubber motor to a specific torque is a better way to go than just counting turns. Changes in temperature and humidity will affect the maximum turns possible much more than the torque. You also can get a real insight to the available power when winding with a torque meter.
Some modelers will build their own meters, while others choose to buy. Meters can be mounted on a winder, or attached to a solid surface. Torque meters have also been designed as winder extensions for use with a blast tube.
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