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).
Comparison table of specifications for three different clutch types.
| Identifier | ExFiles\Box 179b\3\ img024 | |
| Date | 7th January 1933 | |
| -3- HS{Lord Ernest Hives - Chair}/Aln.1/MA.7.1.33. cont'd.{John DeLooze - Company Secretary} Peregrine E & B type R.sch.3513 | Standard Peregrine G.100500 | Borg & Beck 10.A-1-G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Fabric area per surface (sq.ins.) | 31.0 | 22.9 | 45.2 Loading (lbs.per sq.in.) | 28.4 | 44.5 | 30.8 Clutch travel (ins.) | 0.1 | 0.1 | .0825 Finger leverage | 4.75:1 | 3.77:1 | 5.3:1 Thrust bearing load (lbs.) | 212 | 312 | 288 HS{Lord Ernest Hives - Chair}/Aln. | ||