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 for the foot pressure required to release the Goshawk clutch.
| Identifier | Morton\M4.2\ img002 | |
| Date | 17th April 1924 guessed | |
| GOSHAWK CLUTCH FOR COMPARISON WITH H.P. TWO... TOTAL PRESS. ON PLATE (120 lb per sprg?) - 960 lbs AREA OF FRN DISC = 31 □'' PRESS. ON FRN DISC = 960/31 = 31 lbs/□'' (Max?) FOOT PRESS. TO JUST RELEASE CLUTCH [Diagram of a clutch pedal linkage with dimensions 0.75, 2.25, 2.5, 2.90, and forces P and 960 lbs] Press to just release clutch = (960 x .75 x 2.25 x 2.75) / (2.9 x 2.5 x 14) = 44 lbs.. | ||