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).
Two graphs showing performance gains in speed and power from exhaust momentum manifolds on engines with fixed pitch airscrews.
| Identifier | ExFiles\Box 134\1\ scan0050 | |
| Date | 14th December 1937 guessed | |
| EXHAUST MOMENTUM MANIFOLDS TOP GRAPH: TITLE: GAIN IN SPEED DUE TO INCREASE IN ENGINE POWER WITH FIXED PITCH AIRSCREW LEFT Y-AXIS: % GAIN IN H.P. AT F.T. FROM ENGINE CHARACTERISTICS. RIGHT Y-AXIS: % INCREASE IN SPEED IN M.P.H. X-AXIS: % INCREASE IN R.P.M. SOLID LINE: % INCREASE IN ENGINE POWER - FROM TYPE TEST CHARACTERISTICS - ALL S/C ENGINES DASHED LINE: % INCREASE IN SPEED M.P.H. BOTTOM GRAPH: TITLE: GAIN IN SPEED AT VARIOUS MACHINE SPEEDS CORRESPONDING TO POWER INCREASE WITH R.P.M. Y-AXIS: M.P.H. GAIN DUE TO INCREASED POWER X-AXIS: % INCREASE IN R.P.M. CURVE LABELS: 200, 250, 300, 350, 400 | ||