| Résumé | The all-up weights of tilt-wing V.T.O.L. aircraft using tip jets to drive the propellers are presented for the following mission:
Pay load 5,000 lb
Range 500 miles
Hovering Duration 10 minutes
Cruising Altitude 10,000 ft
Wing Loading 60 lb /ft²
The independent variables investigated are propeller disc loading, propeller tip speed, and aircraft cruising speed; an engine of the mixed-bypass type is assumed as the gas generator.
It is shown that only for propeller tip speeds of the order of 900 ft/sec. does the tip jet configuration produce a i r - craft weights as low as those with a conventional turboprop configuration. The gas ducting used to pneumatically interconnect the engines appears t o have about the same weight as the mechanical shafting used with the turboprops. Even with tip speeds of the order of 900 ft/sec, the tip jet has a high fuel consumption, but the low powerplant weight makes it competitive with the turboprop configuration. |
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