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).
Analysis of failures during a 200-hour bumping rig test on an 'SS' chassis.
| Identifier | ExFiles\Box 16\7\ Scan135 | |
| Date | 1st January 1929 | |
| Hs{Lord Ernest Hives - Chair}/Tan/LGl1.1.29. 'SS{S. Smith}' CHASSIS ON BUMPING RIG. Below we give an analysis of the failures during 200 hrs. running of this test. The front and rear ends were bumped for 100 hrs. each. Drum r.p.m. 105. Owing to the amount of trouble with shock dampers, a lot of running had to be done without them. STEERING GEAR. The composition packing washers beneath the radiator came to pieces both sides after 15 mins. running. This was thought to be due to the radiator retaining springs being too weak. 3 radiator fixing studs (F.78163) broke after 15 mins., 4 hrs. 15 mins., and 5 hrs. 45 mins. 5/16" studs were fitted (the originals were 1/4") and these ran 44 hrs. 25 mins. and 45 hrs. (still unbroken). ROAD SPRINGS. Firths Silico-Manganese. Particulars are :- Front 1100 lbs. F.78797 loaded length 45" " 1150 lbs. F.78798 " " " Rear 1400 lbs. F.79446 " " 66" Table shewing spring condition attached. FRONT SHOCK ABSORBERS. Condition : Tyres 60 lbs/sq.in. 32 X 6.75" Dunlop Reinforced. Ballast at rear. 8 restriction washers at first - reduced afterwards to 5. contd :- | ||