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).
Bump test for the Goshawk 11, comparing component failures with the 40/50 HP chassis.
| Identifier | Morton\M1.6\ img030 | |
| Date | 15th December 1921 | |
| ORIGINAL. Hsl/LG15.12.21. BUMP TEST ON GOSHAWK 11 (c.f. 40/50, for Comparison) (344) We attach herewith a further report of the failures we have had on the bump test. Also for comparison, we give a report of failures we have had on the most recent bump test of a standard 40/50 H.P. chassis. If we assume that the Goshawk will be used over the same roads as the 40/50 Car and maintains approximately the same average speed as the 40/50 H.P., we think it is right to subject the Goshawk chassis to the same test as the 40/50 H.P. on the bumping rig. *You will remember that the original bumping test was carried out by means of obstacles on the Track.* The 40/50 H.P. car was only run at a speed of 20 to 25 M.P.H., yet, with that treatment, parts which had stood up for years running on reasonably good roads, failed in a few hours. Bumping tests on the 40/50 H.P. we have always found very reliable and we have by this means been able to reproduce any failures which occurred on the road. It will be seen that on the bump test, the front springs on the 40/50 H.P. are the weakest part. This is confirmed by road experience - in France and U.S.A. they have a fair number of front spring failures on 40/50 chassis. We consider that we ought to be generous in our proportions on the front of the Goshawk when we consider that on the 40/50 H.P. chassis we have had to change dumb irons on all cars, fit diagonal stays to all cars, fit new pivots to all cars, cross steering tubes, steering levers, pendulum levers and contd: | ||