Hi,
I can remember back to my Lockheed P3 days when I was really into turboprops. (had to be!)
Torque is measured in that acft by something called a 'torquemeter' (funny enough), it was mounted in the output shaft of the engine, before the reduction gearbox.
All it did was measure the amount of twist of a specific shaft section, and indicated it via a 40 tooth alignment setup.
It was indicated in SHP (Shaft Horsepower) and was reasonably accurate.
It was also a constant speed engine, very powerful and reliable, allowed up to 4600 SHP, with up to 5,300 SHP for short periods!
Cheers
