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).
Comparison of half-floating rear axles between a Cadillac (60) and a proposed Bentley 50 axle fitted to a Wraith.
| Identifier | ExFiles\Box 111\4\ scan0011 | |
| Date | 16th December 1937 guessed | |
| Table 1. Comparison of Half Floating Rear Axles. Cadillac (60) and Proposed Bentley 50 axle fitted to Wraith. | | | Cadillac 60 | Wraith with B.50 Axle |---|---|---|---| | Unladen Weight | Cwts. | 36 | 41.5 | Petrol | | 1.0 | 1.0 | Passengers | | 6.5 | 6.5 | Luggage | | | 1.5 | Laden Weight | Cwts. | 43.5 | 50.5 | Proportion of Weight on Rear. | % | 54.0 | 59.5 | Load on Rear | Cwts. | 23.5 | 30.0 | Tyre Size | | 7.00 x 16 | 7.00 x 17 | Rolling Radius. | Ins. | 14.3 | 14.85 | Max. Engine Torque | lbs.ft. | 250 | 200 | Rear Axle Ratio. | | 3.92 | 4.65 | 1st. Speed Ratio. | | 2.39 | 3.10 | Max. Axle Shaft Torque } Top | lbs.ft. | 490 | 465 | } 1st. | lbs.ft. | 1170 | 1440 | Load at Tyre, Max. Torque } Top | lbs. | 412 | 375 | } 1st. | lbs. | 985 | 1160 | Axle Overhang | Ins. | 2.95 | .8 Stresses under important conditions. | | | Cadillac 60 | Wraith with B.50 Axle |---|---|---|---| | Dia. of Shaft under Bearing. | Ins. | 1.531 | 1.575 1.625 | Modulus of Section in Bending. | ins.³ | .351 | .383 .421 | (1) Shear stress, straight ahead, Max. Torque, Top Gear. | | 10,400 | 7,520 6,820 | (2) " " " 1st. " | | 21,500 | 22,650 20,550 | (3) Principal stress, coasting, cornering, car about to overturn. | | 101,000 | 133,000 121,000 Handwritten notes in left margin: Recd Axle & Olds 23 80 31 39 17 21 13.6 13.9 67 100 311 462 169 415 477 360 3.417 1.580 1.532 357 7400 9600 74 Handwritten annotations on document: On the line for 'Modulus of Section in Bending.', the words 'Modulus of Section' are crossed out, and the word 'pending' is written above 'in Bending'. | ||