Nomadd wrote:DarkKnight5 wrote:It's not plagiarism if you link to it. Gwynne Shotwell interview highlights.
https://www.bizjournals.com/bizwomen/news/latest-news/2018/05/shes-got-the-scoop-on-spacexs-plans-for-mars.html4. SpaceX can produce one rocket engine per day and two Falcon 9 rockets per month. Shotwell said that this year the company will produce about 14 first-stage boosters, which SpaceX can recover for reuse, and 30 second stages. Those rates pale in comparison to Musk’s electric carmaker Tesla (NASDAQ: TSLA), which is “producing thousands of cars a week,” Shotwell said.
I would guess this means about 250 engines per year, based on working days. That means enough engines to power 25 rocket stacks (both stages). However, they're going to need spares at some point, so I don't know if they'll be able to increase booster production until they can speed up engine production. There's also a real chance that there is not demand at this point to increase either production rate.
14 first stages and 30 2nd stages comes to 156 engines, and they can make up to 250 engines a year. How do you come up with needing to speed up engine production? Even if they book more launches, they don't need to increase 1st stage production since there will be plenty of used boosters piling up.
I didn’t say that they needed to, from a business standpoint, build more rockets per year. I said that their booster production maximum is nearly at its limit based on their engine production maximum. I also noted there’s is not demand to speed up production of either booster or engine.
Summary: I was simply noting stack construction was limited by engine production. Engine construction is the limiting factor in their construction process. I didn’t state it clearly.
There might be some ambiguity in Shotwell’s statement of “2 F9 rockets per month”. I took that to mean the body of the booster since it was differentiated from the engine production. That’s how I read the statement. If taken as a whole, meaning two F9 = 2 stacks + 10 engines, then yeah, I’m wrong and the opposite is true and the booster bodies are the limiting factor and the engines are not.
Boy I’ve tied myself up in knots here. Somebody send her an email to clarify.