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 performed on the latest pattern Firth springs for 40/50 Front Springs.
Identifier | ExFiles\Box 119\2\ scan0216 | |
Date | 29th October 1929 | |
COPY BUMP TEST. RE 40/50 FRONT SPRINGS Test of Latest Pattern Firth Springs, (F71980/1), 1100LBS & 1150 LBS. CONDITIONS: 2" CAMS SET AT 180°. DRUMS MAKE 105 R.P.M. TYRES AT 65LBS/[]'. LOAD ON FRONT OF CHASSIS = 1000LBS. SPRING DETAILS. FRACTURE POSITION OF LEAF POSITION OF FRACTURE FROM CENTRE BOLT APPROXIMATE RUNNING TIME THICKNESS OF LEAF BRINELL AT FRACTURE N°012. NEAR SIDE. F71980. 1100 LBS. FLEXION: COMPRESSION = 1·5"; REBOUND = 2·8". POSITION OF FRACTURES. A BOTTOM. 2" TO REAR. 16 - 23. .200" 363 B NEXT TO BOTTOM. 2" TO REAR. 18 - 23. .204" 363 C TOP. 2·5" TO REAR. 22 - 33. .298" 401 N°013. OFF SIDE. F71981. 1150 LBS. FLEXION: COMPRESSION = 1·8"; REBOUND = 2·5". POSITION OF FRACTURES. D TOP. 2" TO REAR. 13 - 46 .303" 375 N°014. OFF SIDE. F71981. 1150 LBS. FLEXION: COMPRESSION = 1·7"; REBOUND = 2·5". POSITION OF FRACTURES. E 5TH (FROM TOP) 1·5" TO REAR. 46 - 10 .236" 415 F 6TH " " 1·5" TO REAR. 46 - 10 .228" 401 G 7TH " " 1·25" TO REAR. 46 - 10 .217" 388 H 8TH " " 1" TO REAR. 46 - 10 .223" 388 J BOTTOM 1·5" TO REAR. 46 - 10 .210" 401 M TOP 16·5" TO FRONT. 35 - 2 .284" 388 | ||