Slashdot Mirror
Elon Musk Shows off the Dragon Capsule, Back From Space (Video)
Elon Musk appeared Wednesday at SpaceX's testing facility in McGregor, Texas — not far from Waco — along with NASA administrator Charles Bolden, to show off the recovered Dragon capsule that recently launched from Cape Canaveral to the ISS. He says the SpaceX Grasshopper reusable lift vehicle will start testing in a few months, and that once it's in service the cost of a flight to orbit may cost as little as 1/100 as much as it costs today. According to Musk, fuel is only a tiny part of what a space launch costs; boosters and other expensive items that currently only get used once are the main budget-busters. (Note that the Scaled Composites Space Ship Two also relies on a reusable first stage — and that theirs saves both fuel and wear & tear by using aerodynamic lift, AKA wings, for the first 50,000 feet.)
But SS2 isn't leading in that direction. I can't even see any technology developed for SS2 being of any relevance to an orbiter with an aerodynamic first stage.
Note that an aerodynamic booster for an orbiter will require either:
a) a hypersonic booster, or
b) a VERY LARGE orbiter.
Can't see any part of SS2 that points in either of those directions...
"I do not agree with what you say, but I will defend to the death your right to say it"
When near empty, the stages are 10-30 times lighter, because they don't have much fuel, or in the case of lower stages, don't have the upper stages sitting on them. Most of the velocity is lost to a heat shield, so the landing thrust only has to take off 10% or less of the remaining velocity. So it doesn't take that much fuel to land. It takes less fuel than the weight of wings to land.