Word: sealing
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...ribbon commission charged with investigating the explosion of space shuttle Challenger were upstaged last week by a steady stream of disclosures. First, the New York Times revealed that NASA internal documents had long ago warned about problems with the crucial O rings, the two giant synthetic-rubber washers that seal each joint between the booster-rocket segments. Next, an article in Aviation Week & Space Technology spelled out in extraordinary detail how the starboard booster had caused Challenger's external liquid-fuel tank to explode. Then, NASA released pictures showing a mysterious puff of black smoke apparently emerging from the booster...
...occurred. One solid-rocket specialist noted that because the puff was dark, it probably did not result from combustion of the booster's solid fuel, which produces light-colored smoke. More likely, it came from the burning O ring or the putty placed inside the rings to protect the seal...
Harvard earrings--emblazoned with a dangling Veritas seal about the size of a penny ($6.00/pair)--sold by The Harvard Shop...
...boxer shorts with Harvard seal ($5.00) sold by The Harvard Shops...
NASA officials conferred by telephone with Thiokol experts on the day before the launch, said Judson Lovingood, deputy shuttle manager at Marshall Space Flight Center. Their concern, however, was not with the fuel, but with the cold affecting the O rings that seal the rocket joints. After these talks, Lovingood told the commission, "Thiokol recommended to proceed" with the flight. Privately, experts explained that gaps in the seals or cracks in the fuel mixture could allow the hot exhaust gases within the booster to reach the rocket's outer steel casing and burn through it. Another possibility was that...