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).
Use of a 3-inch propeller shaft on the J. 3 model for an increased safety margin.
| Identifier | ExFiles\Box 179\1\ img101 | |
| Date | 18th November 1931 | |
| Y. FROM DA.{Bernard Day - Chassis Design} C. to HS.{Lord Ernest Hives - Chair} J.{Mr Johnson W.M.} 3. PROPELLER SHAFT. DA{Bernard Day - Chassis Design}5/M18.11.31. X5340. We have looked into the question of propeller shafts and though we think that the 2.250 shaft we have proposed is as good as a 3" shaft on the 20/25., we agree that owing to the uncertainty of determining the exact whirling speed on a particular shaft it is desirable to have a considerable margin. We therefore agree to using a 3" shaft on J.{Mr Johnson W.M.} 3., and wish to modify the sheet metal crossmember to correspond. We accordingly send you N. scheme 3365. shewing what we propose. Our great aim is to get no appreciable pot in the floor which can be felt when the carpet is down and the top of the floor is .750 above the level top of the frame. We have already sent you our proposals for modifying the sheet metal crossmember to enable the 3" propeller shaft to be used on the 25HP. DA.{Bernard Day - Chassis Design} | ||