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).
Technical specification for Spectre Front Road Springs, comparing outer and inner spring designs.
| Identifier | ExFiles\Box 95\3\ scan0056 | |
| Date | 18th January 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} +346 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}21/KW.18.1.35. SpectreCodename for Phantom III Front Road Springs - 5" Deflection Hs.{Lord Ernest Hives - Chair}1715/6. Outer Hs.{Lord Ernest Hives - Chair}1715. Inner Hs.{Lord Ernest Hives - Chair}1716. Free length 8.85 8.50 Rate 1125 lbs/in. 615 lbs/in. Load when compressed to 7.000 to be 2080 lbs. 6.650 to be 1140 lbs Wire size .660 dia. .500 dia. No. of working coils 3.5 5.75 Mean radius 2.100 1.500 Normal stress 78000 lbs/sq.in. 69000 lbs/sq.in. Other particulars to G.82226. G.82225. Note. (1) The free length and rate to be correct. Adjustment can be made by altering the number of end coils. (2) Hs.{Lord Ernest Hives - Chair}1716 to work inside Hs.{Lord Ernest Hives - Chair}1715. Copy of details on marked up blue prints. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||