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).
Increased power ratings for the Kestrel B. Type engine.
| Identifier | ExFiles\Box 179b\2\ img125 | |
| Date | 16th November 1932 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Yng. c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to Re. EP.{G. Eric Platford - Chief Quality Engineer} c. to SY. Lr.{Mr Ellor} c. to Lp.{Mr Lappin} Hs{Lord Ernest Hives - Chair}/Yng.1/MJ.16.11.32. INCREASED RATING OF KESTREL B. TYPE ENGINES. 2500 NORMAL R.P.M. A Type Test is now running on a standard 1932 B. type Kestrel - K.1B.1385. - on which the rated normal speed has been increased from 2250 R.P.M. to 2500 R.P.M. From preliminary tests the rating of the engine has been fixed at> 525 BHP. at 3000 ft. Giving a ground level power of :- 510 BHP. For 'Take off' an increase in power other than that resulting from the increase in normal R.P.M. is offered. The 1932 R.{Sir Henry Royce} Kestrel was gated to 440 BHP. at 2250 R.P.M. giving a 'Take off' power of :- 426 BHP. at a speed of 2060 R.P.M. The 'Take off' conditions for the new rating have been determined as follows. A gate power curve has been run at an assumed gate setting of 480 BHP. at 2250 R.P.M. At 2500 R.P.M. the power at this throttle setting proved to be 507 BHP. A gate setting of :- 510 BHP. at 2500 R.P.M. has therefore been declared for the type. The calculated 'Take off' speed for these conditions is :- 2270 R.P.M. at which speed the power available is approximately :- 485 BHP. To sum up, The Type Test now in progress on K.1B.1385 will provide an engine giving an increase in normal power of 45 BHP. and an increase in the 'Take off' power of 60 BHP. over the present standard engine. Hs{Lord Ernest Hives - Chair}/H.R.Young. | ||