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).
Continued report on Goshawk engine ratings, discussing detonation, boost, and potential supercharger improvements compared to the Kestrel engine.
| Identifier | ExFiles\Box 27a\4\ Scan213 | |
| Date | 14th September 1933 | |
| -5- Hs{Lord Ernest Hives - Chair}/Eng.B/JW.14.9.33. Cont'd.{John DeLooze - Company Secretary} On a weight basis however the calorific values are approximately equal. The existing Goshawk rating on DTD.230 is a greatly superior proposition to the existing Kestrel rating on DTD.134. In fact the Goshawk will run up to 8 lbs/sq.in. boost at take off R.P.M. and F.M.P. fuel consumption before starting to detonate. (2) The Increased rating for the Goshawk. At its existing rating on DTD.230 the Goshawk engine does not possess much greater possibilities of an increased rating than the standard Kestrel owing to the limitations of detonation caused by the supercharger working very near to the point of maximum efficiency. Any increase in blower speed therefore whether by higher gear ratios or increased engine speeds brings difficulties rather out of proportion to the results obtained. We consider that the rating given (700 BHP/2900 RPM. + 3 lbs/sq.in. at 11,500 ft.) is possible with the existing engine from considerations of detonation. Alterations will have to be made however to deal with the increased speed and in view of this we feel that the supercharger should be improved also. Hs{Lord Ernest Hives - Chair}/H.R.Young. Attached Curves : 441F. 442F. 443F. 444F. Also copy of laboratory report No.L.2786. L.2788. | ||