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).
Specification table comparing the Kestrel and Goshawk engines.
| Identifier | ExFiles\Box 27a\4\ Scan229 | |
| Date | 20th September 1933 | |
| Hs{Lord Ernest Hives - Chair}/Lov.{Mr Lovesey}1/MJ. Cont'd.{John DeLooze - Company Secretary} 20th. September 1933. -2- Engine. Rated Power. Max. Power & Fuel. Number Exhaust Valves. Number Inlet Valves. Valve Dia. In. Exh. Free Area Past Valve Sq. Ins. In. Exh. Kestrel 480 840 DTD.134 +5 cc's. 2 2 1.625 1.550 1.87 1.8 Goshawk 600 1080 20/70/10 + 4 cc's. 2 1.625 1.550 2.08 2.00 The free areas past the valves of course refer to each valve and assumes the valve to be at full lift. Yours faithfully, For Rolls-Royce Ltd. | ||