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 between a Stutz car and a Rolls-Royce Phantom, analyzing M.E.P. and displacement.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan125 | |
| Date | 20th January 1928 | |
| Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}/LG20.1.28. STUTZ CAR. ---------- It is interesting to note in connection with the attached report that the Stutz gives better acceleration because of its greater engine efficiency, not because it has a greater displacement/ton mile. The actual road wheel M.E.P's at 40 m.p.h. of the two engines are as follows :- CAR. ENGINE R.P.M. ROAD WHEEL M.E.P'S. RR. Phantom 1390 73.0 Stutz 2050 77.2 ---------- -------------- ----------------- Therefore the road wheel M.E.P. of the Stutz is 5.5% better than that of the Phantom. The displacement per ton mile direct drive is :- Phantom 6450 Stutz 6200 In which comparison the Stutz is 4% worse. We may therefore predict that the Stutz acceleration will be 1½% better than that of the Phantom with which it was compared in the road tests, which result is more or less borne out in practice by the figures. We should say that the Stutz figures at 40 m.p.h. on the dynamometer would not be flattering due to the obvious inefficiency of the worm drive under these conditions. ******************** Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||