Just curious. Is Fortran used in SpaceX?

I was wondering the same thing myself the other day. Sorry I don’t have an answer!

Me too. I asked on the Fortran-lang Twitter: https://twitter.com/fortranlang/status/1478452085444255751.

Searching their open positions for Fortran gives no hits, unlike searching for “python”, “java”, “c++”, “matlab”, or “javascript”

Though I’d be surprised if they were hiring for new Fortran development, I would be surprised if Fortran was not used somewhere in the stack. I think we could only find out about this from SpaceX employees who work with such software and if they chose to share such information.

A number of codes for propellant calculations use(d) Fortran. Here are two I could locate from NASA and one other:

- Chemical Equilibrium with Applications (CEA): https://www1.grc.nasa.gov/research-and-engineering/ceaweb/
- Rocket Combustor Interactive Design Computer Methodology: Program For Analyzing Designs Of Liquid-Propellant Rockets - NASA Technical Reports Server (NTRS)
- GitHub - jfchessa/TP-Props: Fortran 90 routines for calculating thermophysical properties of cryogenic rocket fuels

Elon Musk has recommended the book Ignition!: An Informal History of Liquid Rocket Propellants - John D. Clark before in an interview.:

“There is a good book on rocket stuff called ‘Ignition!’ by John Clark that’s a really fun one,”

I remember that Fortran appears in at least one anecdote in the book.

I’d be surprised if these codes were not still in use today. Unfortunately, as Milan has said we’ll have to wait for a SpaceX employee willing to share the information to be sure.