TeknOShEeP
6d ago
Solid rockets are a whole different beast- just as challenging but in that case its more about the chemistry. If you can build a good solid rocket you can build a hell of a bomb. Though worth noting that most nations that have solid rockets but lack other sophisticated industries are for the most part just copying existing designs (usually Soviet- they had a whole portfolio of options for sale on the export market).
Companies that build both rocket engines and jet engines are until recently Pratt & Whitney, GE historically, Safran and Northrup Grumman currently. Also some Chinese makers whos corporate structure I am still confused about because China.
Nothing commercial, but they do engines for some missiles, especially supersonic/hypersonic ones.
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