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).
Specifications for two optional over-riding control springs for the governor control on the 20/25 HP chassis.
| Identifier | ExFiles\Box 105\3\ scan0347 | |
| Date | 24th April 1934 | |
| X5520 Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} BY/HEB{H. Biraben}11/M.24.4.34. 20/25 HP. CHASSIS. GOVERNOR CONTROL TO DAMPERS SEC:7163. OVER-RIDING CONTROL SPRING. With reference to your request for a lighter spring for the above, herewith please find particulars for Springs giving a load of 15 lbs. per sq.in. and 10 lbs. per sq.in. PARTICULARS OF SPRINGS. | | 15 lbs/sq.in. | 10 lbs/sq.in. | |---|---|---| | Dia: of Wire. | 21 SWG(.032). | 22 SWG(.028). | | No: of working Coils. | 5.5 | 5 | | Maximum Load. | 1.660 lbs. | 1.106 lbs. | | Deflection at Max: Load. | .225 | .225 | | Stress(corrected). | 46000 lbs/sq.in. | 45000 lbs/sq.in. | | Rate. | 7.4 lbs/ins. | 4.9 lbs/ins. | | Free Length. | .475 | .475 (handwritten: .525) | | Mean Dia: of Wire. | .336 | .332 | Please let us know the particular spring found satisfactory, so that we can issue a drawing for Production. BY/HEB.{H. Biraben} HEB.{H. Biraben} Suggest these | ||