The fan, of course, must be powered (rotated) by the engine as shown in a typical installation in Figure 1.Ĭal lift normally provided by a fixed wing in cruise flight.
Ducted fan design volume 1 pdf free#
The fan itself has many characteristics of a conventional free propeller, and may be a single stage design, orĬontra-rotating type is, however, seldom used. Thrust is created by the action of air flowing through the duct. Zontally use the duct fan to provide horizontal propulsion with the duct itself providing part, or all of the verti-Įngines, (piston, Wankel, etc.) The propulsion assembly consists of an internal rotating prop or fan, surround-Įd by a close fitting circular wing or duct. The term "Duct Fan" as used here, applies to any enclosed propeller device powered by conventional type In VTOL aircraft, static thrust is used to provide vertical lift, while STOL aircraft designed to fly hori. VTOL designs producing thrust in either static or dynamic flight conditions.
In performance of high speed engines, however, now make a closer look at duct fan applications for light aircraft worthwhile. Propulsion efficiency and lack of suitable powerplants have been major deterents. The most common application is a direct substitution for a jet engine, in a fixed Wild with aircraft configurations using duct fan propulsion units. Engine location may be in front of, or behind the fan, but flow interference losses are greater with the engine locatedĮrs have not had much success with this intriguing approach. As is shown later, the duct fan design and engine characteristics must be matched very carefully to achieve satisfactory performance. In this case the designer has the option of locating the engine inside the fuselage, using pulleys or shaft and gearing to transmit power to the fan. The motor (engine) may be coupled directly to the fan as shown, or a speed changing system may be used. Duct fan propulsion devices have been used on a variety of aircraft and surface vehicles, however, the This article presents an alternate solution, namely the "Duct Fan", or poor man's In most cases the successful programs have evolved into expensive designs aimed at useage by business jet types (where the money is).
Small inexpensive engines for light aircraft. Experimental jet engines have been developed in both England and the U. Preclude use on all but the most affluent and sophisticated project efforts. The astronomical costs and complexities of available jet engines however LL TRUE amateur experimental aircraft buffs harbor a secret desire to build a jet powered airplane.
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