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).
Blueprint graph showing comparative performance curves for various starting motors.
| Identifier | ExFiles\Box 40\5\ Scan107 | |
| Date | 29th December 1922 guessed | |
| COMPARATIVE CURVES OF STARTING MOTORS R.P.M. MOTOR AMPS ASSUMED VOLTAGE DROP 1/2 VOLT 1 VOLT PER 100 AMPS FROM 12V BATTERY AMPS. 1/2 SCALE FOR 12 VOLT CURVES: AMPS W'HOUSE S7A B. 6" 6 VOLT AMPS W'HOUSE T7 B 5 1/2" 6 VOLT AMPS BIJUR 5 1/4" AMPS W'HOUSE S7A B 5" 1/2 SCALE AMPS W'HOUSE T7 B 5" SPEED BIJUR 5 1/4" PRESENT STANDARD 12V SPEED W'HOUSE T7B 5 1/2" 6 VOLT SPEED W'HOUSE S7AB 6" 6 VOLT FT. LBS. TORQUE ON MOTOR SPINDLE KEUFFEL & ESSER CO. NEW YORK. NO. 334 C. 2 | ||