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).
Propeller shaft and axle clearances for a 25HP chassis.
| Identifier | ExFiles\Box 105\2\ scan0127 | |
| Date | 6th November 1931 guessed | |
| (2) With reference to N.scheme 3352, we agree to .200 clearance between the propeller shaft - 2.5 dia.- and the hole in the sheet metal 3rd. crossmember. This may be obtained by raising the upswept flange and hole .100". Should we go to a 2.750 dia. shaft at some future date we would merely cut the slot in the crossmember web a little higher. On the present 25HP. we understand that the rebound of the axle is stopped by the hydraulic damper piston reaching the end of the stroke. This occurs 1" before the free position of the spring we believe. We have shown for J.B. a 5.625 rebound from the full load position as given on your F.57235. At this rebound the shaft is .625 clear of the hole in the crossmember web on our sch. There certainly need be no more than say .250 clearance here when the damper piston is at the end of the cylinder. We are anxious to keep all the axle clearances only just enough on J.B. or else it will be a chassis no better than the present 25HP. from the coachwork point of view. We cannot allow that to happen. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||