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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).
Performance comparison graphs for a J III Rear low pressure engine with different valve setups.

Identifier  ExFiles\Box 179b\4\  img030
Date  6th April 1933 guessed
  
--- TOP GRAPH ---
J III REAR 35/35 LB LOW PRESSURE
BLANK DISC VALVE IN EXT PRESS INLET
4" STROKE
5-4-33
Y-Axis: 308 LB./D" = 133 LB.
X-Axis: 120" I.S.
R.P.M.
180
135
90
45
GOV PRESS 4 LB/D"
45R.P.M - 0LB/D" AFTER ABOVE TESTS
45R.P.M. - 0LB/D" BEFORE ABOVE TESTS

--- MIDDLE GRAPH ---
J III REAR 35/35 LB LOW PRESSURE
.250" EXT. PRESS INLET VALVE - 1 OFF .062" DIA. RELEASE VENT
4" STROKE
6-3-33
Y-Axis: 308 LB./D" = 133 LB.
X-Axis: 120" I.S.
R.P.M.
180
135
90
45
GOV PRESS 4 LB/D"
45 RPM - 0LB/D" BEFORE ABOVE TESTS
AFTER TESTS

--- BOTTOM GRAPH ---
J III REAR 35/35 LB LOW PRESSURE
DISC VALVE DRILLED .015" IN EXT PRESS INLET
4" STROKE
6-4-33
Y-Axis: 308 LB./D" = 133 LB.
X-Axis: 120" I.S.
R.P.M.
180
135
90
45
GOV. PRESS 4 LB/D"
45R.P.M - 0LB/D" BEFORE & AFTER ABOVE TESTS.
  
  


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