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, detailing life, position, and material properties.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan27 | |
| Date | 3rd July 1925 | |
| R.R. 493A (50H) (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. Table of results: | Life of spring. hrs.mins. | Piece No. | Position on chassis. | Diagram. | Position of fracture to cent. | Position of leaf. | Thickness of leaf. | Brinell test. | |---|---|---|---|---|---|---|---| | 20 35 | F.53336 650 lbs. | N.S. front. | [Diagram] | 1 1/4" rear | Top | .250" | 401 | | 24 30 | F.53335 600 lbs. | O.S. front. | [Diagram] | 1 1/4" rear | Top | .252" | 415 | | 18 5 | F.53337 700 lbs. | N.S. front. | [Diagram] | 1 1/4" rear | Top | .248" | 401 | | 35 38 | F.53337 700 lbs. | O.S. front | [Diagram] | 1 1/4" rear | Top | .246" | 401 | | 21 50 | F.53337 700 lbs. | N.S. front. | [Diagram] | 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 bot-tom | .202" | 401 | | 26 38 | F.53336 650 lbs. | N.S. front. | [Diagram] | 1 1/4" rear | Top | .249 | 388 | | 27 10 | F.53336 650 lbs. | O.S. front. | * | 1 1/4" rear | Top | .246" | 401 | | 18 2 | F.53337 700 lbs. | N.S. front. | * | 1 1/4" rear | Top | .252" | 415 | Diagram annotations: 1 1/2" to 2 1/4" 13 3/4" to 14 1/2" With 600 lbs. spring, clips bang up against frame member about every twenty or thirty revs. With 650 lbs. spring there is clearance, but would come hard on buffer rubber. 700 lbs. (12 1/2%) springs there is 1 1/4" to 2" clearance. Average life of 5 N.S. springs - 21 hrs. 2 mins. Average life of 4 O.S. " - 23 hrs. 49 mins. Hs{Lord Ernest Hives - Chair}/L.Swindall. | ||