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).
The performance of the Kestrel Six Cylinder Unit, noting M.E.P., surging, and critical speed.
| Identifier | ExFiles\Box 54\4\ Scan072 | |
| Date | 25th January 1933 | |
| Rg. {Mr Rowledge} From Hs {Lord Ernest Hives - Chair} /Ryce. c. to Wor. {Arthur Wormald - General Works Manager} c. to Lr. {Mr Ellor} X4659. Hs {Lord Ernest Hives - Chair} /Ryce.5/MA.25.1.33. KESTREL SIX CYLINDER UNIT. The power curve and consumption loop herewith have been taken on the above units. The M.E.P. is comparable with that obtained on the old 6 cyl. unit except at speed below 2000 R.P.M. It is thought that the high M.E.P. at 1750 R.P.M. is a feature of the induction pipe. The engine seems inclined to surge at this speed. Critical Speed. The engine begins to get rough at 2550 R.P.M. For this reason the engine has not been run above 2450. At this speed the engine ran unsteadily. It is thought that this was due to the low water pressure at the time (4 lbs/sq.in.). He/H.S.Royce. | ||