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).
Instruction sheet with calculations for Goshawk engine motor performance and specifications.
| Identifier | ExFiles\Box 51\5\ Scan070 | |
| Date | 15th December 1921 | |
| RR.238.(300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B.32. Customer's No. X4342 L Dec 15th 1921 Ratio of field resist. to arm. .898 Length arm. overhang at driving end. .650" Length of com. connections (excluding spokes). .700" Ditto (including spokes) .850" With the Goshawk engine cold, requiring according to our estimate, a motor torque of 66 lbs in/secs, the motor speed would, with these results, be 750 rpm, and the engine speed 89 rpm. The other quantities at this point would be:- Amperes. = 187.5 Volts. 8.25 B.H.P. .80 Efficiency. .38 Signed L'g't'ld. This Sheet must be filed on completion of the work. | ||