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).
Schematic diagram of a helical gear gearbox arrangement for Isotta Fraschini.
| Identifier | ExFiles\Box 2\4\ B002_X 127 128-page35 | |
| Date | 20th October 1936 | |
| ALL HELICAL GEARS SPIRAL ANGLE: 35° 6' 57" DIAMETRAL PITCH: 10 OBLIQUITY: 20° (LAYSHAFT PINIONS 1ST & 2ND) C.M. 21T 27T 3RD 24T 24T 28T 34 O.T.T + D.D.EX 28H- RATIOS 2ND 1.84 TOP 2.13 3RD 1.25 L.R. 2.76 REVERSE SHAFT 20T 3RD MOTION SHAFT 28T 38T 20T 18T 22 2ND MOTION SHAFT REVERSE SHAFT ROLLS-ROYCE LTD. DERBY MERLIN INF. GEARBOX ARRANGEMENT FOR ISOTTA FR. HJH Hs{Lord Ernest Hives - Chair} 996 0.900 1.800 | ||