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).
Performance graph comparing various power ratings for a Kestrel engine with a Kestrel IV blower at different altitudes.
| Identifier | ExFiles\Box 179b\2\ img082 | |
| Date | 11th January 1932 guessed | |
| 339F (1) SUGGESTED RATING FOR KES IV FOR A CIVIL TYPE TEST NORMAL R.P.M. 2500 RATED ALT. 11,000 FT. RATED POWER 590 BHP RATED BOOST +1.25 LBS/SQ IN C.L.P. 528. ENDURANCE POWER FOR T. TEST - 475 BHP (2) ALTERNATIVE At +/- 0 lbs Boost RATED ALT 11500 FT RATED POWER 580 BHP C.L.P. 517 BHP. ENDURANCE POWER FOR T.T. 465 BHP (3) STD KESTREL AT INCREASED RATING (K/279. TYPE TEST.) RATED ALT. 11500 FT RATED POWER 535 BHP RATED BOOST. O.{Mr Oldham} lbs/SQ IN C.L.P. 477. ENDURANCE TESTED 429. BHP (4) STD PRODUCTION KESTREL 'S' RATED ALT. 11500 FT. NORMAL RPM 2250. RATED POWER 480 BHP RATED BOOST -1/2 lb/SQ IN C.L.P. 428. ENDURANCE POWER FOR TYPE TEST 385 HP Graph Lines: KES IV PRODUCT. 2500 RPM +1.25 lbs BOOST. KES IV PRODUCT. 2500 RPM. +/- 0 lbs BOOST. STD KES AT INC. RATING. 2250 RPM. ZERO BOOST. STD PRODN KESTREL 'S'. 2250 RPM. -1/2 lb BOOST. Diagonal Line: FULL THROTTLE BOUNDARY LINE AT 2500 RPM KES IV M.S. & F.S. GEARS Y-Axis: CORRECTED B.H.P. X-Axis: ALTITUDE FT Title: KESTREL IV BLOWER ON STD KESTREL ENGINE | ||