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).
The mathematical formulas for calculating valve spring wave velocity.
| Identifier | ExFiles\Box 56\2\ Scan111 | |
| Date | 22th November 1930 guessed | |
| X290. VALVE SPRING WAVE VELOCITY. The wave velocity = √e/m e = force for unit compression in unit length = force for unit strain (poundals) m = mass per unit length (pounds per inch) Dimensionally √e/m = √((lbs inch² sec⁻²) / lbs) = inch sec⁻¹ e = WgL where W = rate of spring (lbw. per inch) g = gravity (inches per sec²) L = length of spring (inches) Since W = (Cd⁴) / (8D³ k¹L) where k¹ = number of turns per unit length. e = (Cd⁴g) / (8D³ k¹) m = (k¹L + 1) πD x (π/4) .d² w ÷ L = ((k¹L + 1) π² Dd² w) / (4L) | ||