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).
Efficiency calculations for a .720 worm gear using castor oil at 20°C.
| Identifier | ExFiles\Box 67\4\ scan0375 | |
| Date | 3rd October 1927 guessed | |
| .720 WORM. CASTOR OIL. AIR TEMP = 20°C. (SEE FIG. II.) a) PARKING.. tan (θ + γ) = (10.4 x 20) / 900 = 208 / 900 = .231 (θ + γ) = 13° 0' θ = 7° 15' { γ = 5° 45' { μ = .1007 EFF. = .1272 / .231 = 55%. b) tan (θ + γ) = (7.8 x 20) / 900 = 156 / 900 = .1735 (θ + γ) = 9° 51' { γ = 2° 42' { μ = .0472 EFF. = .1272 / .1735 = 73.4%. c) JOGGLES: tan (θ - γ) = (4.15 x 20) / 900 = 83 / 900 = .0922 (θ - γ) = 5° 14' { γ = 2° 1' { μ = .0352 EFF. = .0922 / .1272 = 72.5%. d) tan (θ - γ) = (.900 x 20) / 900 = .0200 (θ - γ) = 1° 9' { γ = 6° 6' { μ = .1069 EFF. = .0200 / .1272 = 15.7%. | ||