ducted propeller


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ducted propeller

[¦dək·təd prə′pel·ər]
(mechanical engineering)
References in periodicals archive ?
The mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a combination of both centrifugal and axial designs.
The ducted propeller was part of the engineering, as shown in Figure 8(a), which was a product of QX MOTOR.
In the light of these assumptions the obvious choice was a platform configuration with two engines mounted in the front of the wings and a ducted propeller placed within the fuselage (Figure 1).
Together with the ducted propeller they were arranged on a circular plan whose centre was located at the mass centre of construction.
2: An open propeller with slipstream contraction & Ducted propeller with diffuser section
Table 1: Characteristic design Parameters Chord 0.4167 ft Lift Curve Slope 4.712 /rad Min Lift Coefficient -1.1 Max Lift Coefficient 1.1 Drag Coefficient Gain 0.9 Drag Coefficient Offset 0.9 Duct Moment Coefficient 0.8 Table 2: Mesh details Mesh type Hybrid mesh (tetra/prism) Global element size 0.04 Prism mesh 0.004 Prism mesh layers around duct 6 Total mesh elements 5,48,446 Mesh nodes 95,317 Table 3: Result Analysis L/D ratio for duct 3.686 L/uD ratio for ducted propeller 3.862
Little information is available on the Piasecki Pathfinder IV, a compound helicopter with the company's patented Vectored-Thrust Ducted Propeller (VTDP) at the rear end.
The Deutz engine turns a ducted propeller in its own housing.
The only compound helicopter concept currently funded by the Defense Department is called the Vectored Thrust Ducted Propeller (VTDP).
Dr Thompson added: "Investigations have revealed a number of features that show the injuries are entirely consistent with the animals being sucked through large ducted propellers.
Piasecki Aircraft has been working on vtol projects employing twin vectored-thrust ducted propellers. It may be assumed that the company's proposal for the US Marine Corps contest was based on its Combat Medic UAV project, one of several studies funded under the US Army's Combat Medic UAS for Resupply and Evacuation programme.