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).
Oil drag test results for the Spectre 1HS gearbox, detailing power loss and torque measurements.
| Identifier | ExFiles\Box 94\1\ scan0159 | |
| Date | 11th July 1935 | |
| SPECTRECodename for Phantom III GEAR BOX - 1 HS{Lord Ernest Hives - Chair} OIL DRAG TESTS. TEST 1. POWER LOSS TOP GEAR 730RPM DRY TORQUE 1 LB FT .139 H.P. MOTORINE "C" 23°C. " 5 " .694 H.P. " " 40°C. " 2.5 " .347 H.P. TEST 2. POWER LOSS. NEUTRAL. 730 R.P.M. DRY TORQUE 0.5 LB FT .069 H.P. MOTORINE "C" 23°C " 2.5 " .347 H.P. " " 40°C " 1.0 " .139 H.P. TEST 3. GEAR LEVER TORQUE REQUIRED TO DISENGAGE 1ST GEAR RELATIVE TO TORQUE APPLIED TO 3RD MOTION SHAFT. 1ST MOTION SHAFT STATIONARY. MOTORINE "C". 3RD MOTION SHAFT TORQUE LB FT. | 0 | 5 | 10 | 15 | GEAR LEVER TORQUE LBFT | 9 | 18 | 32 | 49 | WITHOUT OIL | 9 | 22 | 34 | 45 | MOTORINE "C" 19°C | 9 | 21 | 30 | 44 | " " 40°C TEST 4. TORQUE REQUIRED TO ROTATE 1ST MOTION SHAFT IN 1ST GEAR AT VARIOUS SPEEDS - MOBILOIL "C" | 1ST MOTION SHAFT R.P.M. | TORQUE LB FT | H.P. | INITIAL TEMP °C | FINAL TEMP °C | | ----------------------- | ------------ | ---- | --------------- | ------------- | | + 700 | 19 | 2.53 | 24 | 26 | | + 510 | 17 | 1.65 | 26 | 26 | | + 350 | 13.5 | 0.9 | 26 | 26 | | + 210 | 9.5 | 0.38 | 26 | 26 | | # 700 | 23 | 3.07 | 19 | 21 | + AVERAGE SHOP TEMP 25°C # TAKEN AFTER LEAVING OIL IN COOLER OVERNIGHT. N.B. PLAIN BRG TYPE BOX. MB | ||