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).
Failures with a side spare wheel carrier plate during road and bump testing.
| Identifier | ExFiles\Box 13\5\ Spare05-page065 | |
| Date | 26th August 1929 | |
| To Da.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} filing x7600. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/MJ.26.8.29. SIDE SPARE WHEEL CARRIER. ----------------------- With reference to Da.{Bernard Day - Chassis Design}1/1422.8.29. We must apologise for not discovering that you had approved of larger section tubes. We had not seen a copy of N. scheme 2914 and did not know it was in existence, because no instructions had been issued with regard to larger tubes. Given that we can use the S.S. tubes, we are still in trouble with the plate. We send you the plate which failed after running a short distance on the 10,000 miles test. This indicates clearly the amount of whip which is taking place. We have also just completed 30 hrs. bumping on the carriers and find that exactly the same thing has occurred. The taper headed screws which secure the plate are working about in the hole and soon become loose. On tightening them up, the taper pulls through the plate and wedges in the parallel hole, thereby preventing the plate being secure. One of the difficulties is the small area of face on the 'T' headed bolt which secures the wheel. The plate we send you does not show the point clearly because it was not run very far, but the plate on the other side has distinctly given way at each side of the slot where the centre bolt has been pulling at it. We cannot quite understand why you say the S.S. carrier is perfectly rigid. It is certainly better than the 20 HP. but these we are running here have the wheels sunk in deep wells in the wing. This undoubtedly assists the carrier, but we | ||