[exDM69]

Relatively low cost, yes. But all those recovery efforts, offshore barges, added hardware and software cost actual money that was away from their gross margin from the rocket launches.

It was a good move regardless but don't underestimate the amount of time and money spent.

[phkahler]

Still relatively small beans compared to the cost of the rocket. Remember, they started out simple. They did controlled re-entry burns and let the rocket fall - cost: extra fuel and 10 minutes more of data collection. Then the did a descent down to sea level and a hover before falling into the sea - cost: extra fuel, grid fins (grid fins yet?), more data collection. By the time they went for a barge landing (sorry, drone ship) they had reasonable confidence in having some success - and they hit it. By that point the long term benefits should have been clear, so further development was investment in their future.

All of this should have been done a long time ago by the established players in the industry. It sounded crazy to them, but really the cost of experimenting with re-entry should not have been much and AFAIK they never even tried.

[snrplfth]

One big obstacle to established players was the fact that a lot of existing booster stages had been optimized in such a way that they simply could not survive atmospheric reentry, lateral stress, and could not land. Both major operational US rockets, Delta IV and Atlas V, have exterior insulation (which would burn away upon reentry), relatively thin walls (meaning they're not very strong against aerodynamic buffeting or fin torque), and single engines (meaning that it's very hard to throttle down to land). Adapting these rockets for reusability testing would have meant basically redesigning them from the ground up.

[ufmace]

Probably more importantly, the idea of landing a rocket was basically impossible until computer control got good enough to handle the descent and landing.

[snrplfth]

For sure - but it's been good enough for a while. Consider the McDonnell Douglas DC-X in 1993: https://en.wikipedia.org/wiki/McDonnell_Douglas_DC-X

[greglindahl]

DC-XA set a height record of 10,000 feet, and pretty much goes straight up and down. So it proved out most of what Blue Origin's suborbital rocket does, and the last part of what SpaceX's first stage does, but not the re-entry burn and flying a cylinder stuff.

[_0w8t]

Soviet space shuttle Buran landed automatically from space in 1988 using Soviet-made hardware and software. So I very much doubt that using recent computer chips were essential to land the rocket.

[imron]

> Adapting these rockets for reusability testing would have meant basically redesigning them from the ground up.

And now they're going to have to do that anyway if they want to compete with SpaceX, so what the GP said is true, it's something established players should have done a long time ago, and they're going to be noncompetitive for a period of time as a result.

[snrplfth]

Correct - they just went down the wrong optimization road, so the incremental development program for Falcon 9 landing is nothing they could have replicated.

[exDM69]

Yes, sure it was an impressive R&D program that piggy backed on their production runs.

But it was still an expensive program with Grasshopper test vehicles, lots of failed tests and a reduced capacity on the boosters. "Just a little extra fuel" is a great oversimplification, there's much more than that in doing an atmospheric re-entry.

But a marvelous program it has been and I look forward to seeing their future progress.

[Symmetry]

The real cost of the "extra fuel" was really in making the base rocket big enough to address the majority of the rocket without add-on boosters. Then you always have leftover fuel for more moderately sized satellites. And in terms of design simplicity that might have been worth while before considering reuse.

[mikeash]

I recall that they spent about $1 billion in landing-related R&D before they got it to work. Definitely a lot. (Although, for comparison, a single Shuttle cost about $2 billion to build, not counting any R&D costs.)

But if that $1 billion came from their margins rather than from investment, it means they wouldn't run out of funding unless they ran out of business, which is pretty cool.

[snrplfth]

I believe that the $1 billion figure is for the entire development cost of the Falcon 9 vehicle (stages 1 and 2.)