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).
Graph comparing the altitude performance curves of Kestrel IV, Pegasus, Panther, and Mercury IV engines.
| Identifier | ExFiles\Box 179b\2\ img081 | |
| Date | 8th August 1923 guessed | |
| Title: COMPARISON OF ALTITUDE PERFORMANCE CURVES OF KESTREL IV BLOWER ON STD ENGINE. PEGASUS, PANTHER, MERCURY IV Y-Axis Label (B.H.P.): 650, 600, 550, 500, 450, 400, 350, 300, 250 X-Axis Label (ALTITUDE FT.): 0, 5000, 10000, 15000, 20000, 25000, 30000 Data Series: KES IV BLOWER 3000 R.P.M KES IV BLOWER 2500 R.P.M PEGASUS 2300 R.P.M PANTHER 2200 R.P.M MERCURY IV 2000 R.P.M PEGASUS 2000 R.P.M PANTHER 2000 R.P.M MERCURY IV 2250 R.P.M Other text: 338 F (Top right corner) A.H.S. (Signature, bottom right corner) | ||