Test report on front spring ratings with various configurations and loading conditions.
| Identifier | ExFiles\Box 43\2\ Scan159 | |
| Date | 27th May 1926 | |
| Attached to :- Hs {Lord Ernest Hives - Chair} /RmL/T27.5.26. FRONT SPRING RATING TESTS. α Wide axle pad, 21° forward shackle. Bump loading. β Narrow axle pad, 21° forward shackle. Bump loading. δ Wide axle pad, Vertical shackle. Bump loading. ε Narrow axle pad, Vertical shackle. Bump loading. γ Wide axle pad, 10° inward shackle. Bump loading. η Wide axle pad, 21° forward shackle. (Woodhead's spring) βI Wide axle pad, Vertical shackle. Gradual loading. εI Narrow axle pad, Vertical shackle. Gradual loading. γI Narrow axle pad, 10° inward shackle. Gradual loading. γII= (ε corrected). Narrow pad, verticle shackle, Bump loading | | Mean Rating 300-1200 lbs. (lbs/in). | Mean Rating 1100-1500 lbs. (lbs/in.) | % Variation (approx) increase or decrease. | |---|---|---|---| | α | 372 | 409 | + 10% | | β | 358 | 393 | + 9.8% | | δ | 358 | 360 | + 0.6% | | ε | 341 | 342 | + 0.3% | | γ | 344 | 345 | + 0.3% | | η | 404 | 444 | * 10% | | βI | 372 | 382 | + 2.7% | | εI | 352 | 357 | + 1.4% | | γII | 340 | 344 | + 1.0% | GRAPHS:- 1. (α)v(β) Effect of shackle angle - Wide pads - Bump loading. 2. (δ)v(ε) Effect of shackle angle - Narrow pads - Bump loading. 3. (β)+(ε) Effect of pad width - Vertical shackle-Bump loading. 4. (α)+(γ) Effect of pad width - 21° forward shackle-Bump loading. 5. (β)v(γ) Comparison of spring systems (Narrow pad + 21° forward shackle) Bump loading. (Wide pad + vertical shackle) Bump loading. 6. (α)v(ε) Comparison of spring systems (Narrow pad + Vertical shackle) Bump loading. (Wide pad + 21° forward shackle) Bump loading. 7. (ε)v(εI) Effect of internal friction- Narrow pad -Vertical shackle 8. (β)v(βI) Effect of internal friction- Wide pad -Vertical shackle 9. (α)v(δ) Shewing 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 shackle movement deflection - narrow pad- vertical shackle - Bump loading. 13. (η)v(α) Comparison of springs { (Woodhead's spring. Wide pads - 21° forward shackle) (1st. standard spring. Wide pads - 21° forward shackle) } | ||
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).