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).
Front spring rating tests, comparing different configurations via a data table and a list of graphs.
| Identifier | ExFiles\Box 67a\1\ scan0213 | |
| Date | 27th May 1925 | |
| Attached to :- Ha/Rsl/T27.5.25. FRONT SPRING RATING TESTS. α Wide axle pad, 21° forward shackle. Bump loading. β Narrow axle pad, Vertical shackle. Bump loading. ε Wide axle pad, 10° inward shackle. Bump loading. δ Wide axle pad, 21° forward shackle. Bump loading. (Woodhead's spring) η Wide axle pad, Vertical shackle. Gradual loading. βII Narrow axle pad, Vertical shackle. Gradual loading. εII Narrow axle pad, 10° inward shackle. Gradual loading. γII (= ε corrected). Narrow pad, vertical shackle, Bump loading Mean Rating Mean Rating % Variation (approx) 300-1300 lbs. 1100-1300 lbs. Increase or decrease. (Lbs/in.) (Lbs/in.) α 372 409 + 10% β 355 393 + 9.8% ε 358 360 + 0.6% δ 341 342 + 0.3% η 344 345 + 0.3% βII 404 444 + 10% εII 372 382 + 2.7% γII 352 357 + 1.4% γ 340 344 + 1.0% GRAPHS:- 1. (α) & (β) Effect of shackle angle - Wide pads - Bump loading. 2. (δ) & (ε) Effect of shackle angle - Narrow pads - Bump loading. 3. (β) & (ε) Effect of pad width - Vertical shackle-Bump loading. 4. (α) & (δ) Effect of pad width - 21° forward shackle - Bump loading. 5. (δ) & (β) Comparison of spring systems (Narrow pad + 21°forward shackle) Bump loading. (Wide pad + vertical shackle) loading. 6. (α) & (ε) Comparison of spring systems (Narrow pad + Vertical shackle ) Bump loading. (Wide pad + 21° forward shackle) loading. 7. (ε) & (εII) Effect of internal friction- Narrow pad -Vertical shackle. 8. (β) & (βII) Effect of internal friction - Wide pads - Vertical shackle. 9. (α) + (δ) Showing agreement of independent tests - Bump loading. 10. (γ) Effect of shackle movement deflections - Narrow pad - 10° inward shackle - Bump loading. 11. (γ) Variation in shackle angle - Narrow pad - 10° inward shackle. 12. ε (Corrected) Effect of shac kle movement deflecti on - narrow pad - vertical shackle - Bump loading. 13. (η) + (α) Comparison of springs. { (Woodhead's spring. Wide pads - 21° forward shackle) (1st. standard spring.) } | ||