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).
Report page detailing the observed drop in crankshaft stiffness for various engines and comparing test results with Carter's formula.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan057 | |
| Date | 29th March 1928 guessed | |
| contd :- -2- observed drop in stiffness going from seven to three main bearings for some of our crankshafts :- ENGINE. Crankpin as % of total equiv: length. % drop in stiffness in three bear-ings. Standard 20 HP. 34.2 6.0 Standard Phantom. 27.0 6.5 First 'Sports' Phantom. 42.6 21.0 India 3. 20 HP. 43.5 19.0 From the test results on India 3. shaft in all bearings, the corrected stiffness for one crank is 2.11 X 10^6 lbs.ins/rad. Carter's formula gives :- 2.00 X 10^6 lbs.ins/rad. so that the ratio calculated / test stiffness = .950 or within 5% He/B.S.Tresilian; | ||