By R. S. Ryan

Aerospace comparable difficulties

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Extra resources for A History Of Aerospace Problem,Their Solutions,Their Lessons

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One aside in terms of the synthetic wind profile development was the question of how to properly combine the wind speed, shear, and gust and how to do a conditional probability assessment. Putting together three-sigma (3σ) values of each was obviously too severe. Helmut Horn came up with the idea of conditionally dealing with a 3σ wind speed root-sum-squaring (RSS’ing) the 3σ shear and gust. William Vaughn was fundamental in this also, as well as in developing the wind sounding technology. Because the atmospheric (winds) had preferred monthly directional and speed characteristics, the technology evolved for biasing the launch trajectory to the monthly mean wind, reducing wind induced structural loads and increasing the launch probability/flexibility.

The vehicle lost control somewhat into the flight. The launch took place at White Sands. Due to the severe limitations of the telemetry of that time, the flight vibration environment was largely unknown. The Hermes II project was canceled in early 1950. 19 c. : Swivel Engine Control of Unstable Vehicles. By about 1955, when the design of the Jupiter and Thor IRBM’s and the Atlas and Titan Intercontinental Ballistic Missiles (ICBM’s) began (all having the common Atlas developed engine), the propulsion community had managed to design swivel engines for thrust vector control.

Saturn V Apollo was a three-stage propulsion vehicle plus the manned command and service module and the lunar excursion module (LEM). On later flights, it also contained the lunar rover stowed in the LEM. Figure 21 shows the overall configuration and its characteristics, while figures 22 through 24 are the configuration and characteristics of the three propulsion stages. In the case of the Saturn V Skylab, the SIVB stages were replaced with Skylab space station with only the first two stages being propulsive.

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