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).
Turning circles for different chassis, comparing measurements over hub caps versus track lines.
| Identifier | ExFiles\Box 20\5\ Scan035 | |
| Date | 7th February 1924 | |
| V980 To C.J. from Hs.{Lord Ernest Hives - Chair} c.c. to DA.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}1/LG.7.2.24. TURNING CIRCLES. With reference to CJ1/E1.2.24. The figures you quote for the short chassis turning circles are calculated over the hub caps. All the dimensions we obtain practically are measured on the track lines. The figures given in your memo. are as follows :- 40/50 short chassis ........ L.H. 46' 3 R.H. 49' 3 EAC.111 short ............ " 48' " 50' 5 40/50 long ................ " 44' 9 " 50' 9 When they are all compared on the track lines they come out as follows :- 40/50 short chassis ........ L.H. 44' 10 R.H. 47' 10 EAC.111 short ............ " 48' " 50' 5 40/50 long ................ " 44' 9 " 50' 9 These still show the left-hand turning circle on the short chassis to be practically the same as the long chassis - given the same angle of lock, it must always be a larger circle with a longer chassis. Owing to the cumulative errors in tyre sizes, side steering tube position, chassis side members, location, front axle etc., the turning circles are subject to variation on different cars. In future we propose giving the angle of the lock as well as the turning circles which will show up these variations. Hs.{Lord Ernest Hives - Chair} | ||