SpaceX's Grasshopper VTVL Finally Jumps Its Own Height

cylonlover writes "The SpaceX Grasshopper vertical takeoff vertical landing (VTVL) testbed has successfully flown to a height of 40 meters (131 ft), hovered for a bit and subsequently landed in a picture perfect test on December 17, 2012. The Grasshopper had previously taken two hops to less than 6 m (20 ft) in height, but the latest test was the first that saw it reach an altitude taller than the rocket itself, which is a modified Falcon 9 orbital launch vehicle. The flight lasted 29 seconds from launch to landing, and carried a 1.8 m (6 ft) cowboy dummy to give an indication of scale."

Comments

Re:Whats the advantage of this tech?

[Anonymous Coward]

The big advantage is that when you dunk a booster the seawater gets everywhere and you have to rebuild it.

SpaceX would rather bring it down powered, test it, then launch it again. The cost of the propellant is less than 100K per launch, its the refurbishment, and sometimes wholesale replacement of the parts that really costs a lot of money.

More info on strategy here: http://www.popularmechanics.com/science/space/rockets/elon-musk-on-spacexs-reusable-rocket-plans-6653023

This is no Space Shuttle, its better.

[moniker127]

Space Shuttle:
Payload to GTO: ~3000 kg.
Average cost per flight: 1.5 billion (cost of shuttle program / number of launches)


Falcon 9 rocket:
Payload to GTO:~2000 kg
Average cost per flight: 50m (cost of expendable rocket)


Falcon 9 rocket with grasshopper gear:
Payload to GTO:~1000 kg (rough estimate)
Average cost per flight: ~200,000 (expected figure for fuel + incidentals)


You can do the math to figure out why this is a big deal.

Re:This is no Space Shuttle, its better.

[Anonymous Coward]

While the general tenor of your computation is in the right direction, you're not even closed to calculating the costs fairly. You're not being very rigorous with separating out capital vs operating expenditures. You are hitting shuttle launches with a share of all the development and infrastructure costs, but left that out for SpaceX.

But yes, the *incremental* cost of another shuttle launch is in the 500M range, which is still pretty pricey on a $/kg to orbit.

There are some aspects you've also sort of glossed over: Shuttle is a terrible way to get to GTO, so comparing GTO payload capacity isn't a good metric. Shuttle has the same 3000kg "downmass" capabilty, too, which I don't think F9 or GH have. If you want to bring things back for repair and refurbishment, that's a useful thing to have. Or, you could treat space like remote islands in the Aleutians.. never take anything back, and just dump the old stuff in an ever increasing pile out back for the amusement of workers on their time off.

That said, I think cheap expendable rockets like F9 are really the way to go for the immediate future.

Re:YAY !! 1952 ALL OVER AGAIN !!

[Anonymous Coward]

We weren't doing massive VTVL space rockets in the 50's. And maybe the armchair know-it-alls should just build their own space rockets if it's as easy as picking up a dusty set of blueprints.

The arrogance and delusion is just astounding.