Graph comparing poppet valve and Aspin engine port areas against timing angle in degrees.
| Identifier | ExFiles\Box 134\1\ scan0221 | |
| Date | 21th June 1940 | |
| DES. 8874 A. {Mr Adams} PORT AREA D' ASPIN PROPOSAL 14/11/40 FOR 5.4 ENGINE VERTICAL INCREASE OF PORT BY 25% ASPIN INLET & EXHAUST EXE(Aero Engine) 'DC' EXHAUST SCALED UP TO MERLIN(Aero Engine) THROAT AREA 4.500 D' THROAT AREA 3.310 D' MERLIN(Aero Engine) INLET EXE(Aero Engine) 'DC' INLET SCALED UP TO MERLIN(Aero Engine) MERLIN(Aero Engine) EXHAUST TIMING ANGLE - DEGREES. KEY. MERLIN(Aero Engine) INLET MERLIN(Aero Engine) EXHAUST ASPIN PROPOSAL 14/11/40 FOR 5.4 ENGINE VERTICAL INCREASE OF PORT BY 25% ASPIN INLET AND EXHAUST EXE(Aero Engine) 'DC' EXHAUST SCALED UP TO MERLIN(Aero Engine) EXE(Aero Engine) 'DC' INLET SCALED UP TO MERLIN(Aero Engine). ALL AREAS SHOWN ABOVE HAVE BEEN INCREASED TO SUIT A 5.4 DIA. BORE ENGINE. COMPARISON OF POPPET VALVE AND ASPIN ENGINE PORT AREAS ROLLS-ROYCE LTD. PRINT ROOM 22 JUN 1940 DERBY DES. 8874 A. {Mr Adams} SHAW 21.6.40 | ||
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).