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 and specifications for a low rate spring.
| Identifier | ExFiles\Box 52\1\ Scan183 | |
| Date | 31th January 1929 guessed | |
| X. 4490 LOW RATE SPRING. Maximum load 10.00 lbw (W) Initial load 6.00 lbw. Working compression .700 inches. Rate = 4.00/.700 = 5.71 lbw/inch (R) Compressed length 3.000" (L') Initial " 3.700" Free " 4.750" (L) δ = 1.750" Suppose D = .275 + .048 = .323 Then d = ⁵√(8D³ R L' / C) = ⁵√(8x(.323)³x 5.71 x 3.000 / 12 x 10⁶) = 1/10 ⁵√(.2 x (.323)³ x 5.71) = 1/10 ⁵√(.03848) = .0521 Contd. | ||