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In response to "I'm just surprised ULA can't or won't develop its own engines. They're relying on Russian engines, Blue Origin, and surplus shuttle boosters." by TWuG

It might come from the plane based origins of the two partners that make up ULA. Neither Lockheed nor Boeing have made aircraft engines for -- (edited)

seemingly forever so same business model for the ULA launch vehicles.

There also was the lack of market pressure to drive down launch costs so it was easy / status quo to just buy expensive engines from others.

So it's not like ULA can just ramp up their in-house engine department. They need to start a department from scratch, then develop designs, test / prove them out, produce working engines, and then ramp up engine production.


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