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).
Power curve test report for an F.10 engine, showing results with and without silencers.
| Identifier | ExFiles\Box 36\2\ scan 099 | |
| Date | 13th December 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/VH. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} RG.{Mr Rowledge} c. to BY.{R.W. Bailey - Chief Engineer} X2934 Hs{Lord Ernest Hives - Chair}/VH2/LG13.12.26. F.10. - No.12. X2205 Bar: 772. Power curve witnessed by A.I.D. 8.12.26. | R.P.M. | B.HP. | Pts/HP/Hr. | C.HP. | |---|---|---|---| | 2500 | 517 | .568 | 509 | | 2400 | 524 | .550 | 516 | | 2300 | 528 | .527 | 520 | | 2200 | 523 | .507 | 515 | | 2100 | 506 | .490 | 498 | | 2000 | 482 | .497 | 475 | Engine fitted with :- RR. F.10. horizontal Carburetters. Watford magnetos. This curve was run off on No.8 test bed (with silencers) immediately after the half hour final. | R.P.M. | B.HP. | Pts/HP/Hr. | C.HP. | |---|---|---|---| | 2400 | 526 | .543 | 518 | | 2300 | 452 | .500 | 445 | | 2200 | 413 | .490 | 406 | | 2100 | 374 | .514 | 368 | | 2000 | 352 | .494 | 346 | This curve was obtained by setting the throttle to give 9/10ths. rated power (428 HP.) at 2250 r.p.m., and opening up to full throttle with the brake unaltered. Other speeds obtained by throttling back. contd :- | ||