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).
Particulars and test results for 1150 lbs Firthe and Woodhead front springs.
| Identifier | ExFiles\Box 72\3\ scan0199 | |
| Date | 4th November 1924 | |
| To Me from RHC.{R. H. Coverley - Production Engineer} O/y. X9440 RHC{R. H. Coverley - Production Engineer}3/EU 4.11.24. ROE-RAC.III FRONT SPRINGS. We give below particulars of 1150 lbs Firthe and Woodhead Front Springs. We have also tested the Top and Second leaves of each Spring to find what load was required to give Flat Camber. FIRTH SPRING LEAVES. | | Initial Camber. | Thickness of leaf. | Width of leaf. | Load req. to give flat cbr. | |---|---|---|---|---| | 1ST LEAF. | .625 | .310 | 2.00 | 53 lbs. | | 2ND LEAF. | 2.00 | .250 | 2.00 | 105 lbs. 12 ozs. | | 3RD LEAF. | 1.950 | .250 | 2.025 | | | 4TH LEAF. | 1.800 | .250 | 2.00 | | | 5TH LEAF. | 1.550 | .235 | 2.025 | | | 6TH LEAF. | 1.375 | .230 | 2.015 | | | 7TH LEAF. | 1.125 | .220 | 2.015 | | | 8TH LEAF. | .900 | .220 | 1.985 | | | 9TH LEAF. | .750 | .215 | 2.025 | | | 10TH LEAF. | .425 | .210 | 2.00 | | | 11TH LEAF. | .200 | .210 | 2.00 | | WOODHEAD SPRINGS. | Initial Camber. | Thickness of leaf. | Width of leaf. | Load req. to give flat cbr. | |---|---|---|---| | 1.050 | .290 | 1.975 | 63 lbs. | | 1.437 | .255 | 1.975 | 76 lbs. 12 ozs. | | 1.700 | .255 | 1.990 | | | 1.750 | .235 | 2.00 | | | 1.750 | .230 | 2.00 | | | 1.550 | .235 | 2.00 | | | 1.250 | .235 | 2.00 | | | .975 | .235 | 2.00 | | | .700 | .230 | 2.00 | | | .450 | .235 | 2.00 | | | .275 | .235 | 2.00 | | RHC.{R. H. Coverley - Production Engineer} | ||