| Abstract | Cruising performance data are presented for three types of cycle for dual-operation powerplants, viz. single-stream, dual-stream and mixed-stream cycles. In particular a comparison is made between cruising with jet propulsion at a Mach number of 1.0 at 36,000 ft. altitude, and cruising with propellers at a Mach number of 0.5 (35>O m.p.h.) at 20,000 ft.
It is shown that the propeller cruising schemes exhibit inferior performance in two respects - a higher fuel consumption and a lower hovering power multiplication. The best way to produce adequate amounts of power for hovering, if propellers are to be used for cruising operation, appears to be the use of combustion in an interburner during the short period of hovering operation. |
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