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).
Calculations for torque on the propeller shaft during car braking tests.
| Identifier | ExFiles\Box 77\1\ scan0094 | |
| Date | 20th June 1911 guessed | |
| Torque on prop shaft in today's Gp Stopping Car. X484 X633 Chassis Wt. complete. Say 35 cwt = 3920 lbs Table Headers: vel car brought to rest in:- negative acceleration reversed tractive effort torque on prop shaft Equiv. HP (1000 rpm) Table Data: Row 1: 10 mph = 14.6 ft/ps | 19 ft | 5.65 ft/ps/ps | 688 lbs | 3940 in lbs | 62.5 HP Row 2: 20 mph = 29.3 ft/ps | 33.5 ft | 12.8 ft/ps/ps | 1560 lbs | 8920 in lbs | 141 HP Row 3: 30 mph = 43.9 ft/ps | 94 ft | 10.26 ft/ps/ps | 1250 lbs | 7150 in lbs | 113.4 HP Row 4: 40 mph = 58.6 ft/ps | 174 ft | 9.85 ft/ps/ps | 1200 lbs | 6860 in lbs | 109 HP Lower section: vel. Car brought to rest in:- 10 mp. = 16.6 negative acc Notes/Signatures: Sup Data FRe Left Margin: N-266 | ||