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).
Stiffer spring options and their rates for chassis GAJ-37.
| Identifier | ExFiles\Box 47\5\ Scan155 | |
| Date | 6th October 1927 | |
| X4118 W/S {Derby Works / Sales} -CWB c to Hs {Lord Ernest Hives - Chair} C. to Whr {Mr Wheeler} RECEIVED OCT 6 1927 Hm {Capt. W. Hallam - Head Repairs} /NRC {N. R. Chandler} 1/MW6.10.27 RE CHASSIS GAJ-37 In reply to your CWB-14, we agree that for a car which is normally driven on bad roads, stiffer springs seem desirable. We have in stock the so-called 20% stiffer Spring and would mention that actually this spring is 28% stiffer, not 20% as stated on the drawing F.53045. If the weights of GAJ-37 come out fairly near specification, it would probably be possible to fit 800 lb F.53045 springs in place of the 900 lb F.53169 (Normal) springs. This would lower the car which would in itself tend to reduce swaying and at the same time the risk of hitting the buffers would be rendered, but I would not suggest fitting these springs till we know the actual weight on each axle so as to confirm the above figures re tendancy to bump. The 800 lb 20% (28%) stiffer spring is 14% stiffer than the 900 lb normal spring the "rates" in lbs per inch being as follows:- 900 lb normal Spring = 175 lbs per inch 900 lb "20%" Stiffer Spring = 225 lbs per inch 800 lb " " " = 200 lbs per inch Probably 650 lb front springs would meet the case. Hm {Capt. W. Hallam - Head Repairs} /NRC {N. R. Chandler} CWB | ||