From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
From 'R' to Mr Bowley regarding issues with an old muff shaft coupling's workmanship, grip, and torque limits.
| Identifier | Morton\M7\ img002 | |
| Date | 1st April 1924 guessed | |
| Shaft Couplings Dear Mr Bowley from R I cannot believe the old muff Coupling is right unless it has good workmanship, both machining & fitting of keys You report that your work demands greater grip than our sellers pattern coupling gives, This shows that our arm. shafts have very heavy torques, which used to be limited by the slipper drive, I consider it was a mistake to scrap this & put no limit to the motors torque, which with C C motors is enormous before it throws out cutout, probably some of our slipper wheels were set to slip for too low a torque. | ||