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).
Blueprint detailing the specifications and tooth profile for the Peregrine engine gears.
| Identifier | ExFiles\Box 136\1\ scan0031 | |
| Date | 28th June 1932 guessed | |
| ENGINE GEARS - PEREGRINE CRANK PINION Nº OF TEETH: 24 DIAM: PITCH: 10.94871 CIRC: ": .40578 PITCH DIA: 3.100 LEAD: 9.7389 SPIRAL ANGLE: 45° L.H. OBLIQUITY: 20° CHORDAL THICKNESS: .14346 ADDENDUM: .09133 DEPTH OF TOOTH: .2055 CAM PINION 48 TEETH CRANK PINION 24 TEETH ROLLING SLIDING SCALE 5/1 | ||