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).
Road spring failures and their performance characteristics.
| Identifier | ExFiles\Box 119\2\ scan0269 | |
| Date | 1st July 1925 | |
| R.R. 493A (50B) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/LS/LG3.7.25. ROAD SPRING FAILURES. Life of spring. hrs.mins | Piece No. | Position on chassis. | Diagram | Position of fracture to centr. | Position of leaf. | Thickness of leaf. | Brinell test --- | --- | --- | --- | --- | --- | --- | --- 20 35 | F.53336 650 lbs. | N.S. front. | [Diagram] | 1 1/2" rear. | Top | .250" | 401 24 30 | F.53335 600 lbs. | O.S. front. | [Diagram] | 1 1/2" rear | Top | .252" | 415 18 5 | F.53337 700 lbs. | N.S. front. | | 1 3/4" rear. | Top | .248" | 401 35 38 | F.53337 800 lbs. | O.S. front. | | 1 1/2" rear. | Top | .246" | 401 21 50 | F.53337 700 lbs. | N.S. front. | | 2" rear. | Top | .252" | 400 7 58 | F.53336 650 lbs. | O.S. front. | [Diagram] | Centre bolt. | Top | .246" | 375 25 28 | F.53336 650 lbs. | N.S. front. | [Diagram] | 2" rear | 4th. from bottom. | .202" | 401 26 38 | F.53336 650 lbs. | N.S. front. | [Diagram] | 14" rear | Top | .249" | 388 27 10 | F.53336 650 lbs. | O.S. front. | | 14" rear | Top | .246" | 401 18 2 | F.53337 700 lbs. | N.S. front. | | 14" rear. | Top | .252" | 415 With 600 lbs. spring, clips bang up against frame member about every 20 or 30 revs. With 650 lbs. spring there is clearance, but would come hard on buffer rubber. 700 lbs. (12 1/2%) springs there is 1 1/2" to 2" clearance. Average life of 5 N.S. springs = 21 hrs. 2 mins. " " " 4 O.S. " = 23 hrs. 49 mins. Hs{Lord Ernest Hives - Chair}/L.Swindall. | ||