Piper Aircraft

About: Piper Aircraft is a based out in . It is known for research contribution in the topics: Thrust reversal & Injector. The organization has 11 authors who have published 8 publications receiving 134 citations. The organization is also known as: Piper Aircraft Inc. & Piper Aircraft Company.

Aircraft engine fuel system

Abstract: The fuel system includes a fuel tank, a fuel pump for pumping fuel through a control unit and a start control unit to the nozzles of the aircraft engine, a reservoir, a conduit for draining fuel from the engine nozzles into the reservoir after the engine shut-down, and a jet pump for pumping the drained fuel from the reservoir to the fuel tank in response to engine start-up. The jet pump includes an aspirator having a nozzle supplied with fuel under pressure from the fuel supply system. A solenoid-actuated valve is disposed in the fuel conduit feeding the nozzle and is actuated in response to operation of the engine starter switch. In use, fuel from the nozzles is drained into the reservoir after engine shutdown. When the starter switch is closed to start the engine, the solenoid-actuated valve opens to supply high velocity fuel to the jet pump thereby to aspirate the fuel in the reservoir for delivery to the fuel tank. When the starter switch is turned off, the valve returns to its normally closed condition preventing further fuel discharge and operation of the jet pump. A check valve is installed in the conduit communicating between the reservoir and the fuel tank to prevent reverse flow of fuel into the reservoir and jet pump.

Duct spacer clip and duct assembly

Abstract: Disclosed is a clip for spacing concentric ducts or tubes one from the other. The clip includes an elongated strip of sheet metal bent medially of its length to define a first apex and a pair of segments symmetrical on opposite sides of a plane. Each segment includes a first segment portion extending away from the apex and plane, a second segment portion extending toward the plane and defining with the first segment portion a second apex, and a semicircular flange at its end. The clip is disposed between the concentric inner and outer tubes forming the duct assembly at spaced axial positions therealong. The apices and flanges engage the outer tube and the segment portions engage the inner tube. The clip serves to minimize heat transfer between the tubes, and accommodate thermal expansion and contraction of one tube relative to the other while maintaining concentricity and providing substantially unimpeded flow through the annular space between the tubes.

Jet pump for aircraft cabin pressurization system

Abstract: The jet pump includes a primary nozzle in communication with the compressor section of the aircraft''s turbine engine whereby primary air is bled from the engine for delivery through the primary nozzle. A secondary nozzle surrounds the primary nozzle and lies in communication with ambient air. Primary and secondary air issuing through the primary and secondary nozzles flows into a mixing tube and then through a divergent section for delivery to the aircraft cabin. The jet pump functions, and without the aid of ancillary control devices, to provide an acceptable predetermined air flow rate for pressurizing the aircraft cabin throughout the full altitude range of the aircraft.

Radio-controlled model design and testing techniques for stall/spin evaluation of general-aviation aircraft

Abstract: A relatively inexpensive radio-controlled model stall/spin test technique was developed. Operational experiences using the technique are presented. A discussion of model construction techniques, spin-recovery parachute system, data recording system, and movie camera tracking system is included. Also discussed are a method of measuring moments of inertia, scaling of engine thrust, cost and time required to conduct a program, and examples of the results obtained from the flight tests.