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).
Letter from the Experimental Dept. advising on a Phantom III 'pitching' issue.
| Identifier | ExFiles\Box 96\1\ scan0071 | |
| Date | 8th March 1937 | |
| 361 (Experimental Dept.) Rm{William Robotham - Chief Engineer}/Les5/R.{Sir Henry Royce} PER AIR MAIL. 8th March, 1937. Messrs. Kellow Falkiner Pty Ltd., Kellow House, 379, Kilda Road, Melbourne, S.C.2. AUSTRALIA. Dear Sir, We understand from Mr. Hanbury that you are experiencing some trouble with the riding of a Phantom III 2.AZ.56. The complaint appears to be what we call "pitching". We strongly recommend no alterations to the springs. Actually the rear springs of Phantom III are stiffer than those of Phantom II, which in conjunction with more flexible front springs has enabled even periodicities front and rear of the car and thus largely reduced the tendency of "pitching". From your letter it would appear that the shock absorber control system was most likely at fault. Possibly short of oil or dirt in the pump unit. If, however, you need to increase the damping on the front you will find the attached print of G.83747 useful. It is not possible to check the front damper loads on the car, and a special complete suspension unit is required to check the damper valve chamber separately. If you find that more front damping is required, we recommend reducing the thickness of the washers G.85595-9. These washers now hold the valve .012" off their valve seats. These might be reduced by .006" so that the valves are only .006" off their seats. The other adjustment is the load on the valve spring, which is adjusted by the thickness of washers G.85602-6. | ||