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).
Technical page with calculations for spring stress, rate, and coil diameter under a given load.
| Identifier | ExFiles\Box 52\1\ Scan182 | |
| Date | 31th January 1929 guessed | |
| -3- Contd. Spring of given load, compressed length. Rate and coil diameter for maximum stress. We have given W, L' = L - S, R = W/δ and D. {John DeLooze - Company Secretary} Since f {Mr Friese} /W = (C d δ / π D² n) x (8 D³n / C d⁴ δ) The stress f = 8 DW / π d³ so that d must be as large as possible. The limit of (n+1) d is L' Since the rate R = W/δ = C d⁴ / 8 D³n is given and C is fixed and D is given n ∝ d⁴ Actually n = (C / 8 D³ R) · d⁴ so that if we say n d = L' we have (C / 8 D³ R) · d⁵ = L' or d = ⁵√(8D³RL' / C) Then n = C d⁴ / 8 D³R and f = G d S / π D²n EFC. {E. Fowler Clarke - Electrical Engineer} | ||