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The Gulfstream II business jet is a low wing aircraft of moderate sweep featuring a T-tail arrangement and two aft-mounted turbofan engines. The paper outlines aerodynamic development of the configuration and control system, highlighting significant design decisions and aerodynamic characteristics with appropriate experimental data including force, pressure, and flow visualization results. Aerodynamic design considerations included: wing optimization to meet the requirements of high and low speed performance and a pitch-down stall break at all flight conditions while providing adequate fuel volume; nacelle-pylon-wing relationship for optimum drag, engine characteristics, and airplane balance; and an empennage arrangement providing satisfactory stability and control at all conceivable flight conditions. The Gulfstream II configuration provides strong aerodynamic resistance to inadvertent secondary stall entry and more than adequate recovery capability.

Part task trainers are an integral and important group of training devices now being used in the manned space programs. These devices are used to train the astronauts in discrete portions of a flight profile. It may operate one day as a rendezvous trainer and the next as a lunar landing trainer. The device consists of a computer complex, simulated cabin interior, external out-the-window display, and an instructor's complex. Arriving at a design philosophy requires a good working knowledge of the purpose of this type of trainer and the state of the art of various electronic, optical, and mechanical devices required by the trainer. Selecting the computer and optical systems is a difficult task requiring many compromises and trade-offs to arrive at the best and most economical system possible.

This paper presents the results of a planned program to investigate step-stress-to-failure testing as a technique for design improvement and reliability evaluation of electronic equipment. The test philosophy is presented along with a discussion of the test set-up, method of data analysis, implications from test results, and advantages over present failure rate type testing. The implications and recommendations made are based on an actual test-to-failure performed on an item of modular electronic equipment.