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).
Continued bump test report for the latest pattern Firth springs, showing fracture details.
| Identifier | ExFiles\Box 52\2\ Scan111 | |
| Date | 29th October 1924 | |
| BUMP TEST OF LATEST PATTERN FIRTH SPRINGS, (F71980/1), CONT? TABLE: COLUMN HEADERS: SPRING DETAILS, FRACTURE, POSITION OF LEAF, POSITION OF FRACTURE FROM CENTRE BOLT., APPROXIMATE RUNNING TIME., THICKNESS OF LEAF, BRINELL AT FRACTURE ROW 1: SPRING DETAILS: Nº 015. NEAR SIDE. F71980. 1100 LBS. FLEXION: COMPRESSION = 1.5"; REBOUND = 2.8". POSITION OF FRACTURE (Diagram shows fracture 'K' near centre bolt). FRACTURE: K POSITION OF LEAF: TOP POSITION OF FRACTURE FROM CENTRE BOLT.: 2" TO REAR APPROXIMATE RUNNING TIME.: 11 - 35 THICKNESS OF LEAF: .300" BRINELL AT FRACTURE: 388. ROW 2: SPRING DETAILS: Nº 016. NEAR SIDE. F71980. 1100 LBS. FLEXION: COMPRESSION = 1.5"; REBOUND = 2.8". POSITION OF FRACTURE (Diagram shows fracture 'L' towards rear end). FRACTURE: L POSITION OF LEAF: TOP POSITION OF FRACTURE FROM CENTRE BOLT.: 16.5" TO REAR APPROXIMATE RUNNING TIME.: 13 - 37 THICKNESS OF LEAF: .285" BRINELL AT FRACTURE: 388 | ||