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).
Blueprint with diagrams and a graph comparing two-stroke valve opening areas for different engine designs.
| Identifier | ExFiles\Box 134\5\ scan0011 | |
| Date | 28th November 1940 | |
| TITLE: TWO STROKE VALVE OPENING AREAS MAIN TEXT: THE CURVE FOR THE G.M IS ACTUAL AND ALL THE OTHERS HAVE BEEN MADE TO THE SAME COMMON BASIS, THE AREAS BEING PROPORTIONAL TO THE PISTON AREA. THE SIZE OF THE KADENACY VALVE IS UNKNOWN, IT HAS PROBABLY A MASKED OPENING & OBVIOUSLY OF IMMENSE SIZE,- A SLOW SPEED ENGINE. ASPIN'S 2 STROKE INLET VALVE RUNS AT HALF ENGINE SPEED. THE TWO INLET PORTS & TWO PLUGS PER CYL ARE USED ALTERNATELY. THE EX PORTS ARE UNCOVERED BY THE PISTON. TO RUN THE ASPIN ROTARY VALVE AT ENGINE SPEED RESULTS IN DOUBLING THE PORT OPENING AREAS NOW THIS MEANS DESIGN CONSIDERATION WHICH AT THE MOMENT I CANNOT SAY IF IT IS PRACTICAL. GRAPH LABELS: Y-Axis: AREA OF VALVE OPENING. []'' X-Axis: CRANKSHAFT DEG°. B.D.C Curves: - MR WOODS SLEEVE VALVE EXHAUST - KADENACY POPPET EX - ENGINE SPEED ROTARY VALVE - G.M. TWO POPPETS EX - HALF SPEED ROTARY VALVE - ASPIN DIAGRAM LABELS: - Top Diagram: 4 1/16, 2 1/16 - Middle Left Diagram: Half Speed opening 33 1/2°, Engine Speed opening 67° - Bottom Left Diagrams: MR WOOD'S ENGINE (EX, IN AIR), ASPIN (IN, EX) - Bottom Middle Diagram: GM. & KADENACY (EX, AIR) STAMP (Right side): ROLLS-ROYCE LTD PRINT ROOM DEC 28 1940 DERBY SIGNATURE BLOCK (Bottom right): k.m.c 28.II.40 | ||