Test report on the friction horsepower and mechanical efficiency of a Phantom II engine.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan007 | |
| Date | 18th August 1930 | |
| ORIGINAL To Ds. From Hs {Lord Ernest Hives - Chair} /ACL. c. to Rg. {Mr Rowledge} Hs {Lord Ernest Hives - Chair} /ACL.2/MJ.18.8.30 X7771 PHANTOM OVER-RUN TORQUE. We have made a test of the friction H.P. of the Phantom 11 engine at 1000 R.P.M. by the method of cutting out cylinders - with speed remaining constant - and obtaining the average H.P. drop per cylinder. The friction H.P. at 1000 R.P.M. (i.e. the power to rotate the engine) is 7.9 H.P. The actual H.P. developed was 54.9. With friction H.P. of 7.9 the indicated H.P. would be 62.8 giving a mechanical efficiency of 87.4%. Hs {Lord Ernest Hives - Chair} /ACL. | ||
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).