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).
Calculations comparing two design variants (Fig A and Fig B) of a mechanical component, including dimensions, inertia, and weight.
| Identifier | ExFiles\Box 130\3\ scan0125 | |
| Date | 28th February 1940 | |
| Top Section (Fig A): Diagram Dimensions: 1.850, .650, .525, .650, 14.5, 14.15 (circled), .205, .015, 11.9, 10.725, .895, 12.125. Diagram Labels: A, B, C, D, E, F, Fig A.{Mr Adams} Annotation: if 14.05, I=623, W=13.25 Calculations for Inertia (I): Column Headers: d, d⁴-d₂, w, (πx.283)/32, I A: d(19.95, 14.5), d⁴-d₂(50000, 44200, 5800), w(x .650/2), calc(x .02777 = 52.4) B: d(14.5, 14.15), d⁴-d₂(44200, 40000, 4200), w(x 1.850), I(= 216) C: d(14.15, 12.125), d⁴-d₂(40000, 21600, 18400), w(x .525), I(= 268.5) D: d(12.125, 11.9), d⁴-d₂(21600, 20050, 1550), w(x .280), I(= 12.) E: d(11.9, 10.725), d⁴-d₂(20050, 13250, 6800), w(x .205), I(= 38.7) Total I: 587.6 Calculations for Weight (W): Column Headers: area, in³, W LBS A: area(175.5, 165, 10.5), calc(x .65/2 = 3.41) B: area(165, 157.3, 7.7), calc(x 1.85 = 14.25) C: area(157.3, 115.5, 41.8), calc(x .525 = 21.95) D: area(115.5, 111.2, 4.3), calc(x .28 = 1.2) E: area(111.2, 90.5, 20.7), calc(x .205 = 4.24) Total Area: 45.05 Total W: x .283 = 12.75 Bottom Section (Fig B): Diagram Dimensions: .200, .975, 14.50, 13.80, 11.9, 12.125, 12.400. Diagram Labels: A, B, C, D, E, F, x, Fig B. Annotation: x Extra cost machining not justified WRP Calculations for Inertia (I): (Carried over value: 52.4) A: d(14.5), d⁴-d₂(44200, 36200, 8000), w(x 1.85), calc(x .02777 = 41.1) B: d(13.8), d⁴-d₂(36200, 23600, 12600), w(x .2), I(= 70) C: d(12.4), d⁴-d₂(23600, 21600, 2000), w(x .525), I(= 29.1) D: d(12.4, 12.125), d⁴-d₂(21600, 20050, 1550), w(x .28), I(= 12) E: d(11.9, 10.725), d⁴-d₂(20050, 13250, 6800), w(x .205), I(= 38.7) Total I: 613.2 Calculations for Weight (W): (Carried over value: 3.41) A: area(165, 150, 15), calc(x 1.85 = 27.75) B: area(150, 121, 29), calc(x .2 = 5.8) C: area(121, 115.5, 5.5), calc(x .525 = 2.89) D: area(115.5, 111.2, 4.3), calc(.28 = 1.2) E: area(111.2, 90.5, 20.7), calc(.205 = 4.24) Total Area: 45.29 Total W: x .283 = 12.8 | ||