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Torsionmeter and how engine power calculated

Torsionmeter is used to measure the torque developed in the shaft.principle: when torque is applied to a shaft an angular twist Ɵ is produced, which is dependent on the shaft torsional rigidity.
(torque= ( torsional rigidity X radius X angular twist)/shaft length.)
 the angular twist is measured by measuring the magnetic distortion .
power =- 2πnt/60
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