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).
Performance comparison table for Goshawk, Kestrel, and R. Engines.
| Identifier | ExFiles\Box 179b\3\ img352 | |
| Date | 22th March 1932 | |
| -3- Ha/Aln.2/MJ.22.3.32. Cont'd.{John DeLooze - Company Secretary} Goshawk. Kestrel. R.Engine. Max. Boost 19.5 "Hg. 18.0 "Hg. .. at lbs/min. 70.0 40.0 .. and eff'y. 63% 58% Max. Eff'ty 64.5% 61% 69.5% at lbs/min. 83.0 67.0 .. and boost 18.8 "Hg. 15.8"Hg. 18.95"Hg. and delivery per sq.in. 3.89 4.05 3.82. rotor peri- phery. Ha/F.J.Allen. Attached: 8 Prints. | ||