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Bluto said:Can't we do better than 30 year old technology? Why are we still relying on these dinosaurs for our space program?
9GClub said:http://www.thespaceplace.com/nasa/spinoffs.html
We also fly in space 'cause it's there.
In related news, this insulation-shedding propensity is freaking me out, guys. NASA brass is now saying that the largest piece that fell off this time "could have been bad"...... by which of course they mean a repeat of three years ago. As much as I love to see them fly, blowing chunks so consistently is unacceptable.
I'm sure they've looked into alternative fuel sources.... wasn't Spaceship One a few months ago powered by solid rubber and alcohol? Don't quote me on that, but something like that might eliminate the need for thermal insulation. Somebody who knows what they're talking about please chime in.
EagleRJ said:-There have been several attempts to develop a replacement for the Shuttle. The most mature was the X-33, a single stage to orbit lifting body with a more efficient "aerospike" engine that would serve as a technology demonstrator for a much larger version, called the VentureStar. The program was making good progress, but was killed due to funding issues.
NuGuy said:The answer is actually in how the foam insulation is produced for the exterior of the external tank.
mzaharis said:SpaceShip One uses the fuel system due to simplicity of engine design and manufacture for a throttleable engine. It doesn't make any difference on the thermal protection system, which comes into play on reentry, when the engines are off. SpaceShip One had a much more benign thermal entry regime due to its relative low speed (<M4, vs. M25 on Space Shuttle entry interface).
9GClub said:Eagle and MZ,
Thanks for the info, that helped.
The thermal insulation I was referring to is the foam on the external tank, not the tile matrix on the orbiter. A SS1-esque fuel configuration (or something besides LOX/hydrogen) would make a difference because you wouldn't need to insulate the fuel tank(s).
Alternatively, fly with the current fuel setup and just bolt the landing craft to the top of the rocket. That wouldn't solve NASA's apparent birdstrike problems (I'd love to see a video clip from the camera that caught that incident), but it would be a step in the right direction in terms of foam impacts.