QUOTE(Dave_Darling @ Jan 21 2013, 01:32 AM)
QUOTE(bperry @ Jan 20 2013, 02:36 PM)
I always thought it was interesting that he knew (and I assume others knew) the cause
of the problem immeidately, yet we spent so much time and money trying to "figure out" the problem.
The proximal cause was evidently pretty immediately known. The time and money was spent trying to figure out how the safeguards that should have prevented the problem failed, and what to do about that.
--DD
And there is even more to it than that. NASA made a Public Relations choice- go with disposable non-recoverable solid rocket boosters (SRB"S), or go green and "recycle" the boosters. The shuttle was the first time they ever bothered to recover, refurb and reuse the SRB's. In the grad class, we had an interesting discussion on the effects of a water dunk on an extremely hot SRB, and apparently they never followed up on their idea of an "inflatable" balloon" that would fill the SRB nozzle and prevent the ingress of cooler seawater. We spent a good amount of time discussing the effects of a quick non-uniform quench on the the steel used on the SRB. Can you say "warp it" boys and girls?
Fast forward several years and I was hanging out with one of my old college friends. Seems he worked in the Vehicle assembly building and oversaw the stacking and assembly of the SRB segments. Like the Titan III SRB design, different length segments could be stacked and bolted together to produce more or less thrust to orbit. He quit that job because it scared him. First, the segments were warped and ovaled after the dunking/cooling process, and they had to build the stack horizontally. They ran a chain through the central star opening within the solid fuel, and suspended the segment from the loop of chain. They rotated the stack segment around the chain axis to allow gravity to correct the ovaling, and then tried to ram the segments together. Once they got the tapered edges of the segments sorta together, they supported from underneath and tried to pull the chain out. And if that didn't work, they would press, poke, squeeze, and hammer to fit.