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).
Tables comparing stress calculations for axle shafts under varying overhang and design conditions.
| Identifier | ExFiles\Box 111\4\ scan0012 | |
| Date | 29th December 1937 guessed | |
| Table 2. Effect of Increasing Overhang. Dia. of Shaft. in. 1.575 1.575 1.575 1.625 1.625 1.625 1.750 Overhang. in. .8 1.5 3.15 .8 1.5 3.76 1.5 Condition (1) Max.Torque Top Gear. 7520 8100 10400 6820 7360 10400 6740 Condition (2) " " 1st. Gear. 22600 22950 24400 20550 20900 22300 19100 Condition (3) Cornering. 133000 128000 113000 121000 116500 98000 106500 Table 3. Comparison of stresses under condition (3) between half floating axle shafts and standard fully floating axle tubes. B.11 Wraith 11 Half floating axle Tube. Tube. shafts (1.5" overhang) O.D. Tube or Shaft. 1.77 1.97 1.625 1.750 Section Modulus. .382 .546 .421 .526 Max. Stress 71800 59500 116500 106500 Yield stress of material used. 89500 89500 112500 112500 Max. Stress ÷ Yield stress. .80 .65 1.04 .95 | ||