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).
Comparison of gauge and weight ratios for steel versus light alloys (Aluminium and Magnesium) in various automotive components.
| Identifier | ExFiles\Box 154a\1\ scan0275 | |
| Date | 7th March 1940 | |
| Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}24/MR.7.3.40. STEEL AND LIGHT ALLOY COMPARISONS BASED ON Rm.{William Robotham - Chief Engineer}609. (1) Frames of constant dimensions but varying gauge. Deflection to be constant. Comparison based on Tensile stress and constant elongation. Ratio of gauges Al/Steel = 3.00 : 1 " " " Mg/Steel = 5.00 : 1 " " weights Al/Steel = 1.07 : 1 " " " Mg/Steel = 1.05 : 1 (2) Axle Tube of constant mean dia. and strength. Comparison based on Tensile stress and constant strength. Ratio of thickness Al/Steel = 1.50 : 1 " " " Mg/Steel = 2.00 : 1 " " weights Al/Steel = 0.536: 1 " " " Mg/Steel = 0.461: 1 (3) Body panel of constant shape but varying gauge. Comparison based on beam of constant width and:- (a) Constant Deflection. Ratio of gauges Al/Steel = 1.44 : 1 " " " Mg/Steel = 1.71 : 1 " " weights Al/Steel = 0.52 : 1 " " " Mg/Steel = 0.40 : 1 (b) Constant Strength. Ratio of guages Al/Steel = 1.22 : 1 " " " Mg/Steel = 1.41 : 1 " " weights Al/Steel = 0.44 : 1 " " " Mg/Steel = 0.33 : 1 Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||