Abstract: A method to reduce the wave resistance of an airplane by disposing a fluid element such as an engine nacelle at a predetermined position on an upper surface of a main wing, positively superposing the air flow generated by the fluid element onto the air flow on the upper surface of the main wing, thereby establishing a gentle profile of pressure on the upper surface of the main wing, and retarding the generation of a shock wave. If the engine nacelle is disposed on the upper surface of the main wing, and the longitudinal position of the front end of the engine nacelle is set in a range of 63% to 100% from the front end of a wing chord of the main wing (see b and i in FIG. 9), a shock wave is generated on the upper surface of the main wing in the range of a transonic speed to inhibit an increase in wave resistance. Thus, the cruising speed can be increased, while avoiding an increase in amount of fuel consumed.

Abstract: A data transmission system comprising a plurality of data processing units connected to each other by optical fiber. Each data processing unit comprises optical/electrical converter means for converting an optical signal from the preceding data processing unit through the optical fiber to an electrical signal, electrical/optical converter means for converting an electrical signal to be sent to the succeeding data processing unit to an optical signal, a data receiving unit for receiving the converted electrical signal, means for determining whether or not the received signal was sent from the local data processing means, and gate means connected between the optical/electrical converter means and the electrical/optical converter means, the gate means being closed when the local data processing means performs data transmission and opened for alternative data receiving/passing.

Abstract: A regenerative fuel pump, comprising: a disc-shaped pump rotor having a plurality of vanes along its periphery; a pump housing accommodating the pump rotor; a fluid inlet port provided in the pump housing along a longitudinal direction; an arcuate fuel passage extending in the pump housing from the inlet port along the periphery of the pump rotor; a fluid outlet port communicating with a terminal end of the arcuate fuel passage; and a slot extending from the inlet port a certain distance into the arcuate fuel passage along an inner circumferential region thereof; the slot extending longitudinally from the arcuate fuel passage to pump exterior through a substantially straight path and circumferentially through a tortuous path. Preferably, the slot is defined by a separate member which is fitted into a recess provided in the pump housing.

Abstract: A pump apparatus comprising a rotary pump including a rotatable shaft having opposite ends to which are drivingly connected a pair of brushless motors. A rotor is secured to the shaft and is mounted within a pump chamber. A drive circuit is connected to the brushless motors to drive the same in synchronism. All of the above components are contained in a casing.

Abstract: Temperature measuring device for an internal-combustion engine comprising a main engine temperature sensor to measure the temperature of the cooling water, for example, and a secondary or auxiliary temperature sensor disposed near a heat generating element in an electronic engine control unit, as a standby for the main temperature sensor.When an output of the main temperature sensor happens to fall outside the predetermined normal range, the main temperature sensor will be immediately switched to the auxiliary temperature sensor to allow the various phases of engine control to proceed without interruption.