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).
Torsion test report for a 20 HP (China) crankshaft.
| Identifier | ExFiles\Box 63\4\ scan0086 | |
| Date | 14th October 1929 | |
| To .R. from Hs{Lord Ernest Hives - Chair}/Tsn. C.c. RG.{Mr Rowledge} C.c. WOP. L. C.c. DS. EY. X 4499 Hs{Lord Ernest Hives - Chair}/Tsnl/AD14.10.29. X5010 X4499 TORSION TEST OF 20 H.P. (CHINA) CRANKSHAFT E.55307. This shaft, recently standardised, has a torsional stiffness of 29,570 lbs.ft/radian, in the crankcase with all bearings fitted. It is 13% stiffer than the last shaft tested E.54601, with 1.500 dia pins, and 81% stiffer than the original standard 20 H.P. shaft E.54064. The shaft has the following general particulars:- Crankpins Journals. Outer dia. 1.750" 2.125" Inner dia. .875" 1.125" Max. width of webs 3.250" Std. nose (unsplined) Std. oiling scheme with oil caps. It has not got the shorter journal bearings. The stiffness per crank is 2.850 x 10^6 lbs.ins/rad against a calculated value using Carter's torsion formula of 3.020 x 10^6. The ratio calc/test stiffness is 1.06, which is closer than we have been getting with Carter's formula recently. Hs{Lord Ernest Hives - Chair}/Tsn. | ||