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).
Calculation to estimate the axle movement required to cause the second stage of a shock absorber to function.
| Identifier | ExFiles\Box 79\2\ scan0045 | |
| Date | 11th May 1923 guessed | |
| To Estimate the Movement of Axle required to cause the second stage of the Shock Absorber to function XU329 Ordinary Setting Shock Absorber ball centre (a) is 1.25" above horizontal ∴ ∠ θ = Sin⁻¹ 1.25" / 11 = .11363 = 6°31' Now from the nature of the shock absorber plates it will be observed that the second plate will come in 10° after the first one (in point of fact it all depends where it was left by the last bump). ∴ ht. through which the ball joint has to be raised for plate to come in = (11 x Sin 16°31') - 1.25' = (11 x .2843) - 1.25' = 3.1273 - 1.25 = 1.877 Ins. The corresponding height through which the spring centre will move is 1.877 x 28/24 = 2.19" ∴ The pt. on the axle centre in line with the ball joint will move 2.19" | ||