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 rating and preliminary development tests for the 1000 HP Buzzard engine.
| Identifier | ExFiles\Box 179\2\ img029 | |
| Date | 9th December 1931 | |
| R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/WG.{Mr Gill - Financial Director} c. to Sg.{Arthur F. Sidgreaves - MD} Mer. c. to R.{Sir Henry Royce} H.{Arthur M. Hanbury - Head Complaints} c. to RY. x4674 x4453 RATING OF THE 1000 HP 'BUZZARD'. It is our intentions to build a Buzzard engine to develop a 1000 HP utilising the knowledge which we have gained from the 'R' engine. This engine - 1000 HP Buzzard - is to be run at full throttle at ground level, the normal RPM blower gear ratio being adjusted to make this possible. During the preliminary tests for the development of the new engine 'Y' 45 has been used. This engine is fitted with 110º (1931 R) camshafts E.38135 giving a valve timing of I.O. 50º ABC (.030" clearance) 6/1 CR{Mr Cra???ster / Mr Chichester} pistons, 5.9/1 supercharger gears. The exhaust valves are salt filled in accordance with standard 'Y' practice. Running has been carried out using DTD 134 fuel and Lodge A2 plugs, but the full throttle power curve was run on DTD 134 and Spd's TSL/gall and Lodge x17b plugs. P.2. oil was used throughout. RESULTS OF TESTS. The initial tests proved that detonation was too severe to permit the engine being run at full throttle on DTD 134 fuel, but in order to investigate the performance of the engine as regards power and boost available under these conditions a power curve 101 'R' (attached) was run on leaded fuel. This shews that we have just over 1000 HP available at 2000 RPM. Tests were then carried out in order to obtain results for comparison with figures of previous development work on an 'R' engine ('R'II) running at Buzzard powers - ref curve 13 R-. This curve compares the power available and detonation intensities at full throttle of a standard Buzzard engine and 'R'II when fitted with 118º Camshafts E.33195 (1929. R.{Sir Henry Royce} standard) 5.9 S/C gears 5.5/1 CR{Mr Cra???ster / Mr Chichester} and uncooled exhaust valves. RII was throttled so that the detonation at 2000 RPM was of the same intensity as:- (1) The standard Buzzard 'Y' aft. (2) RII with 5.9 S/C gears and 5.5/1 CR{Mr Cra???ster / Mr Chichester} - 'Y' aft. -1- | ||