Word: boosterous
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
Earlier in the week, engineers from Morton Thiokol, which manufactures the shuttle's booster rockets, said they argued against the launch because they feared booster safety seals would not work properly after a night in subfreezing weather...
...week's most tantalizing story, in Aviation Week, reported that the jet of flame from the side of Challenger's right booster had either melted or wrenched loose the struts that held the booster to the lower end of the external tank. The booster then pivoted on its still intact upper-attachment fitting and crashed its nose into the tank wall. The escaping liquid oxygen and liquid hydrogen ignited, causing the fatal explosion. At week's end NASA had not commented on the report...
Nearly everyone, including the space agency, seemed to be zeroing in on a failure of the right booster rocket, probably at its bottom joint, as the event that initiated the tragedy. The puff of black smoke seen in the NASA photographs and videotape lends support to theories that an O ring was at fault. According to a flight "time-line" compiled by NASA and released at week's end the smoke first appeared .445 seconds after booster ignition. It swirled between the rocket and the external tank, near where the fatal burnthrough seems to have occurred. One solid-rocket specialist...
What might have caused an O ring in the right booster to fail? Panelist Feynman demonstrated one possibility at the public hearing by conducting a simple experiment in front of the TV cameras. He placed a small section of a ring in a C-clamp and submerged it in a cup of ice water. Then, removing the section and releasing it from the clamp, he concluded, "The resilience is very much reduced when the temperature is reduced." That fact may be significant, because the booster joints that the O rings are supposed to seal shift under the enormous stresses...
NASA's Mulloy conceded that the rings start to lose their resiliency at a temperature of 50 degrees F. But despite some reservations expressed the day before the tragedy by booster manufacturer Morton Thiokol, Mulloy said, NASA technicians had concluded (and Thiokol experts concurred) that the seals would work. Mulloy later volunteered that even if the primary O ring failed, the backup ring "would seat as it has done in the past, even under those temperature conditions...