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).
Progress of a type test on an F.11 7/1 compression ratio engine.
| Identifier | ExFiles\Box 36\2\ scan 151 | |
| Date | 2nd February 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} L. c. to BY.{R.W. Bailey - Chief Engineer} Fl. X29384 Hsl/LG23. 2. 28. F.11 - 7/1 COMPRESSION RATIO ENGINE. ------------------------ The type test on this engine using fuel to A.M. specification is now running. The fourth 10-hrs. run should be completed today. So far we have had no trouble. The maximum power this engine is asked to develop on the ground is 480 HP. We have run the half hr. test at 480 HP. at 2250 r.p.m. which is asked for. For full throttle and power curves we are allowed to use doped fuel or extra benzol. We are collecting warm air from one of the exhaust manifolds and leading it to the air inlet to avoid freezing. On the recent type test on the F.12 6/1 engine, we used the same arrange - in that case we were allowed a temp. correction for the air, but in this test we are only allowed a correction for the test house temperature. We lose approx. 5 HP. by using the exhaust heated air. Although the regulations do not ask for it, we can run this engine full power on the standard fuel and can reproduce the same power curve as we do with the doped fuel except for a drop of about 2 HP. at 2000 r.p.m. The engine we are running is using more oil than the 6/1 engine. This helps as regards reducing the risk of detonation. Our experience with the 8/1 comp: engines in the air shews that the engine has a very much easier time | ||