Golf-Ball Sized Hail Damages Shuttle

MattSparkes writes "The Shuttles March launch has been delayed to late April after golf-ball sized hail caused 7000 pits and divots in the foam that shields the fuel tank. NASA say it's the worst damage of its kind that they have ever seen, but hail is not a new problem for the agency. In 1982, a hailstorm damaged the sensitive heat shield tiles on the Columbia's wings. The damaged tiles then absorbed about 540 kilograms of rain. Once in space, the orbiter faced the Sun to allow the tiles to dry out."

Comments

Heh, apparently hail ain't their only problem

[bad_fx]

[quote]NASA has had less serious problems with fuel tank foam as well. In 1995, a shuttle on the launch pad had to be returned to its hangar for repairs after woodpeckers punched about a dozen small holes in the tank's insulation.[/quote]

That got a bit of a chuckle; It's in the article linked from TFA.

Paradigm shift

[TWX]

Maybe there really is something to all of those science fiction movies that show space ports opening like a clamshell a few minutes before the spacecraft lifts off, especially if the air inside was temperature and humidity controlled. That kind of thing might have prevented Challenger's destruction and would keep any craft free from weather-related damage before takeoff...

Re:Paradigm shift

[hcdejong]

The only problem with that is keeping the clamshell (and the whole building) from being blasted to smithereens during takeoff. The noise level alone is enough to crumble concrete, add to that the temperature and pressure, and you see why rockets are usually launched in the open. True, missiles are often launched from canisters or silos, but:

1. Smaller missiles often use a cold-gas ejection system. The motor doesn't ignite until the missile is out of the canister. Some systems (e.g. Mk 41 VLS) ignite the missile in the canister. In this case, the canister consists of an inner tube that contains the missile, and a fixed outer tube. When reloading, the inner tube is replaced. This is doable for a missile, not so much for a Shuttle-sized rocket.

2. For larger missiles (ICBMs), a reusable launch site isn't the top priority. Damage to the silo is more acceptable here than for a NASA launch facility.

Re:Paradigm shift

[140Mandak262Jamuna]

ISRO has fixed launch pads and the Vehicle assembly building moves on rails out of the way for launch. NASA has a fixed Vehicle assembly building and the rocket moves on very complex tracked vehicle a few miles to the launch site. So far ISRO has not launched anything the size NASA has. The largest payload by ISRO, a six ton Low earth orbit, 1 ton Geostationery payload (quoting from memory, pardon errors) is very small compared to what NASA has done. So the building capable of assembling something the size of space shuttle cant easily move out of the way. But the could try to create a simpler building mainly to protect the vehicle without all that expensive jigs and assembly equipment that moves out of the way on the day of launch. They would not really like to have a fueled vehicle inside a building.

hang on...

[symes]

Golf balls have bumps and divots over the surface to enable longer flight times. Surely these additional bumps will also aid the shuttle's aerodynamics?

Re:Exactly how hard...

[SydBarrett]

Uh oh, NASA forgot to put the shuttle in the garage after they got back from the mall. Their dad is gonna be SO pissed.

Re:Obviously

[aadvancedGIR]

That foam really tied the fuel tank together, did it not?