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 report for latest pattern Woodhead 12.5% type springs.
| Identifier | ExFiles\Box 119\2\ scan0210 | |
| Date | 14th October 1924 | |
| RE. 40/50 FRONT SPRINGS 14-10-24. BUMP TEST. TEST OF LATEST PATTERN WOODHEAD 12.5% TYPE SPRINGS (F71790/1/2). CONDITIONS: 2" CAMS SET AT 180°. DRUM MAKES 105 RPM. TYRES AT 65LBS/sq" LOAD ON FRONT OF CHASSIS = 1000LBS. TABLE DATA: Column Headers: DETAILS OF SPRING | FRACTURE | POSITION OF LEAF | POSITION OF FRACTURE FROM CENTRE BOLT | APPROXIMATE RUNNING TIME (HRS MINS) | THICKNESS OF LEAF | BRINELL AT FRACTURE Data Block 1: DETAILS: N°005. NEAR-SIDE., F71790., 1100 LBS. FLEXION: COMPRESSION = 1.6", REBOUND = 2.58". POSITION OF FRACTURES. ROW A: FRACTURE: A | POSITION OF LEAF: Bottom (FIRTH). | POSITION FROM CENTRE BOLT: 1.5" TO FRONT. | RUNNING TIME: 13 - 7 | THICKNESS: .223" | BRINELL: 363 ROW B: FRACTURE: B | POSITION OF LEAF: NEXT TO BOTTOM. | POSITION FROM CENTRE BOLT: 1.75" TO FRONT. | RUNNING TIME: 14 - 47 | THICKNESS: .225" | BRINELL: 375 Data Block 2: DETAILS: N°006. OFF SIDE, F71792., 1200 LBS. FLEXION: COMPRESSION = 1.5", REBOUND = 2.53". POSITION OF FRACTURES. ROW D: FRACTURE: D | POSITION OF LEAF: BOTTOM. | POSITION FROM CENTRE BOLT: 1.5" TO REAR. | RUNNING TIME: 22 - 12 | THICKNESS: .227" | BRINELL: 388 ROW C: FRACTURE: C | POSITION OF LEAF: TOP. | POSITION FROM CENTRE BOLT: 2" TO REAR. | RUNNING TIME: 26 - 17 | THICKNESS: .285" | BRINELL: 363 Data Block 3: DETAILS: N°007. OFF SIDE, F71791., 1150 LBS. FLEXION: COMPRESSION = 1.9", REBOUND = 2.5". POSITION OF FRACTURES. ROW E: FRACTURE: E | POSITION OF LEAF: BOTTOM. | POSITION FROM CENTRE BOLT: 1.5" TO FRONT. | RUNNING TIME: 13 - 3 | THICKNESS: .225" | BRINELL: 375 ROW F: FRACTURE: F | POSITION OF LEAF: TOP. | POSITION FROM CENTRE BOLT: 2" TO REAR. | RUNNING TIME: 19 - 36 | THICKNESS: .278" | BRINELL: 375 Data Block 4: DETAILS: N°008. NEAR SIDE, F71790., 1100 LBS. FLEXION: COMPRESSION = 1.8", REBOUND = 2.4". POSITION OF FRACTURES. ROW G: FRACTURE: G | POSITION OF LEAF: BOTTOM | POSITION FROM CENTRE BOLT: 1.5" TO REAR | RUNNING TIME: 24 - 56 | THICKNESS: .228" | BRINELL: 375 ROW H: FRACTURE: H | POSITION OF LEAF: TOP | POSITION FROM CENTRE BOLT: 1" TO FRONT | RUNNING TIME: 31 - 1 | THICKNESS: .285" | BRINELL: 363. | ||