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).
Diagrams illustrating forces, angles, and loads on helical gear teeth.
| Identifier | ExFiles\Box 136\1\ scan0318 | |
| Date | 12th April 1940 guessed | |
| ψ = HELICAL ANGLE W = TANGENTIAL TOOTH LOAD IN DIAMETRAL PLANE. WN = TANGENTIAL TOOTH LOAD IN NORMAL PLANE FIG 1. φ = PRESSURE ANGLE WN = TANGENTIAL TOOTH LOAD IN NORMAL PLANE WT = NORMAL TOOTH LOAD IN NORMAL PLANE WC = COMPRESSIVE TOOTH LOAD. (THESE FORCES DO NOT ACT IN THIS PLANE) FIG 2. | ||