A History Of Aerospace Problem,Their Solutions,Their Lessons by R. S. Ryan

By R. S. Ryan

Aerospace similar difficulties

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During the launch phase at around 60-s flight time, it was observed that problems had occurred with the micrometeoroid shield as evidenced by the rising temperature; however, the launch continued flawlessly and the Skylab was injected into orbit. In orbit, when the workshop solar wings were being deployed, it was clear that a mooring problem had occurred. Data indicated that one wing was gone and the other only partially deployed. Also, the temperature of the workshop was rising to dangerous levels, threatening medical supplies, etc.

The Redstone thrust chamber was cooled through the double-shelled construction of 1 /8- and 1/4inch plates and contained several expansion joints. The shell plates were replaced by very long, thin tubes that significantly reduced the engine weight, eliminated thermal buckling problems, and allowed high-rate gimbaling at reduced actuator loads and power. Alcohol and hydrogen peroxide fuel systems gave way to a common kerosene lox propellant system for propulsion and pump turbine power. It should be remembered that, initially, the Redstone was to be essentially a German V-2 built to American standards by the Army with the Germans brought to this country after World War II.

They next had to move the beam out a full 90˚. This they did with a tether that Kerwin pulled and Conrad lifted in the middle (mechanical advantage), thus moving the beam out to the deployed position. The jolt knocked both of them away, but the tether contained them and they reentered the workshop. Once inside the workshop, it was possible to warm up the actuators and fully deploy and lock in the solar wing. The system could now be balanced and the solar observation and laboratory work begun. At the start of the second mission, the second Sun shade was deployed during astronaut extravehicular activity (EVA).

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