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).
With suggestions for improving drivetrain components, focusing on shaft diameter, coupling bolts, and material choices to handle torque.
| Identifier | Morton\M7\ img003 | |
| Date | 1st April 1924 guessed | |
| alternate(2) With alternate currents the max Torque is limited. I understand to about twice full load torque & does not need slipper drive to prevent excessive strain on skidding wheels The [crossed out] results also show that your cam shafts should run released faster or be of larger dia, Kindly examine all new work & make some improvements, cheaper to run them faster. say 1/2 or 1/3 [crossed out] motor speed. The Coupling can be improved by larger bolts 3/4 instead of 7/16. I do not think the cone angle will make much difference it soon becomes mostly friction, another way is to use more bolts in numbers, say one on each side = 6 or 9 bolts, also one might weaken the bushes [crossed out] 4 5 or even 6 splits & fit each with its own 5/8 instead of 7/16 bolt if the outer band bursts it should be cast in steel or made of wrought steel. The shafting would break from fatigue with alternate torque much below max stress, so that 1/2 mild steel stress might be enough for the friction grip with loose fitting keys for emergency. | ||