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).
Friction horsepower test on a Phantom II engine.
| Identifier | ExFiles\Box 92\2\ scan0095 | |
| Date | 18th August 1930 | |
| To Da.{Bernard Day - Chassis Design} From Hs{Lord Ernest Hives - Chair}/ACL. c. to Rg.{Mr Rowledge} 8771 Hs{Lord Ernest Hives - Chair}/ACL.2/MJ.18.8.30 PHANTOM OVER-RUN TORQUE. We have made a test of the friction H.P. of the Phantom ll 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. | ||