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> Which means SpaceX reaches the program break-even point earlier I mostly agree, but it's entirely possible that they just spread the cost out more, which wou
by singingboyo 8y ago
> Which means SpaceX reaches the program break-even point earlier
I mostly agree, but it's entirely possible that they just spread the cost out more, which would reduce the cost of individual launches.
As far as production goes - my recollection is that SpaceX does a lot of in-house stuff, so they've got vertical integration going for them. Perhaps more importantly, they build their own engines, and lots of them (10 per rocket, as I believe MVac is similar enough to the first stage engines to use essentially the same production). That's a pretty big advantage over buying RD-180s like ULA.
Also, doesn't SpaceX use essentially 'off-the-shelf' electrical components, and just use more if needed for redundancy? 'Space-grade' hardware isn't cheap, so if they really are avoiding that entirely, that could be a big win.
Whatever the case, unfortunately for us, they're a private company - so this is all semi-educated guesswork. They definitely seem to be doing well, so clearly something somewhere is keeping those costs down.
- hef19898 8y agoYep, I fully agree. Would be real fun to dig into SpaceX numbers. I'll just for the IPO then. And it is impressive what they achieved.
- dotancohen 8y agoAn Mvac takes two weeks to build, vs about a day for a sea-level Merlin. It's not just a different bell. If a sea-level Merlin fails (and this has happened, I think on CRS-5) the remaining eight engines gimbal a bit and burn a bit longer. If the Mvac fails the second stage and payload are lost. So the vacuum engine is built to far higher standards than the sea-level engine. The Falcon 1 even went so far as to strip the most failure-prone part of the engine that could be eliminated, the turbopump, and simply pressure feed the vacuum engine. They called it Kestrel, but the combustion chamber and most of the rest of the motor (sans bell) was identical to the Merlin on the first stage.