The irony is that the segmented SRB and the tiles were both selected assuming a shuttle flight a week or something. It was policy/religion to have nothing on the shuttle that was throw-away.
They could have used expendable boosters and bolt-on, one-time ablative heat shields - bog reliable technology - and saved a lot of lives and money. The tiles are especially fragile and expensive, not to mention ugly.
John
I think they can afford the platinum-catalyzed cure RTV.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Yes.
Perhaps with the ablative coating-- whatever it is-- robotically applied to the bolt-on surface and automatically tested over the whole surface (if necessary) for high reliability. Making one a week or one a day from virgin materials would be a snap for their contractors- that's just the kind of quantities they typically deal in anyway. Keep the most expensive and less stressed parts, figure out how to cheaply and reliably build lots of the more stressed parts and throw them out after use.
AFAIUI, the tiles are made in thousands of different shapes and thicknesses and have to be individually hand-applied.
About $100,000,000 per spacecraft using a value of $4,000 per tile*
24,000+ tiles. And a bunch of them get damaged every time it flies.It was an interesting idea. Maybe it should have stayed in whatever brainstorming session it came out of.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I was looking at a rifid paper and was interested that to test the temperature between tiles rifids were inserted that relayed temperature. Trial heating was carried out with a plasma torch. Perhaps more interesting for the humble electronics engineer was the fact that the tiles were held on with modified RTV. Wonder if the acid is buffered?
-- dd
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