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 diagram for the Goshawk Clutch.
| Identifier | ExFiles\Box 22\1\ Scan063 | |
| Date | 16th January 1924 guessed | |
| GOSHAWK CLUTCH FOR RAPIDE WITH 44 PINS TOTAL PRESS ON PLATE (12 lbs per pin) = 960 lbs AREA OF FAN DISC = 31 □" PRESS ON FAN DISC = 960/31 = 31 lbs/□" each) FOOT PRESS TO JUST RELEASE CLUTCH Press to just release clutch = (960 x .75 x 2.25 x 2.75) / (2.9 x 2.5 x 14) = 44 lbs | ||