Horsepower losses in the W.W. and Derby exhaust systems compared to the standard 40/50 system.
| Identifier | ExFiles\Box 38\4\ Scan063 | |
| Date | 1st April 1924 | |
| POWER LOSSES TO EXHAUST SYSTEMS WITH THE W.W. AND DERBY SCHEMES ON THE STANDARD 40/50 The following figures give the loss in H.P. of the two schemes relative to the standard 40/50 system. The tests were taken with cut-out open. | R.P.M. | H.P. with std. 40/50 R.R. exh. systems. | Power loss relative to standard. | |---|---|---| | | | W.W. exh. system. H.P. | 'Derby' exh. system. H.P. | | 2250 | 89 | 2.3 | 1.6 | | 2000 | 84.4 | 3.3 | 1.7 | | 1750 | 83.9 | 3.15 | .6 | | 1500 | 74.6 | 2.17 | .7 | | 1250 | 64 | 1.9 | .5 | | 1000 | 51.2 | .45 | .3 | | 750 | 38.3 | --- | .2 | | 500 | 25 | .2 | --- | | ||
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).