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 on Woodhead 12 1/2% type front springs, detailing fracture analysis.
| Identifier | ExFiles\Box 119\2\ scan0208 | |
| Date | 8th October 1924 | |
| BUMP TEST. RE 40/50 FRONT SPRINGS. TEST OF LATEST PATTERN WOODHEAD 12 1/2% TYPE SPRINGS (F71740/1). CONDITIONS: 2" CAMS SET AT 180°. DRUM MAKES 105 R.P.M. TYRES AT 65 LBS/sq.in. LEAD ON FRONT OF CHASSIS = 1000 LBS. TABLE HEADERS: FRACTURE, POSITION OF LEAF, POSITION OF FRACTURE FROM CENTRE BOLT, APPROXIMATE RUNNING TIME (HRS. - MINS.), THICKNESS OF LEAF, BRINELL AT FRACTURE SPRING N°001. NEAR-SIDE. F71740 - 1100 LBS. FLEXION: COMPRESSION = 2.00", REBOUND = 2.68". POSITION OF FRACTURES. Row A: Top Leaf, 2" TO REAR., 17-18, .224", 388 Row B: Bottom Leaf, 2" TO FRONT., 17-18, .238", 331 Row C: Bottom Leaf, 2" TO REAR., 17-18, .238", 363 Row D: Next to Bottom, 2" TO REAR., 17-18, .230", 352 SPRING N°002. OFF-SIDE. F71741 - 1150 LBS. FLEXION: COMPRESSION = 1.93", REBOUND = 2.58". POSITION OF FRACTURES. Row E: Top Leaf, 1.5" TO FRONT., 24-40, .283", 363 Row F: 7TH (FROM TOP), 7.5" TO REAR., 24-40, .228", 415 Row G: 8TH (FROM TOP), 7.5" TO REAR., 24-40, .228", 363 Row H: Next to Bottom, 2" TO REAR., 24-40, .230", 388 Row J: Bottom Leaf, 2" TO REAR., 24-40, .230", 401 SPRING N°003. NEAR-SIDE. F71740 - 1100 LBS. FLEXION: COMPRESSION = 1.67", REBOUND = 2.57". POSITION OF FRACTURES. Row K: Bottom Leaf, 2" TO REAR, 13-52, .227", 341 Row L: Next to Bottom, 2.75" TO REAR., 17-17, .222", 415 | ||