Why is it that variable geometry nozzles, like those found on jet engine(iris nozzles), are not used as rocket nozzle to provide better altitude compensation?
Haha! A couple of years back I had given a talk on aerospike engine! Recently came across this video and it sparked my interest again it. Lol.This video does not directly answer your question, but it talks a lot but altitude compensation.
Thank you. Yup that makes sense. If the cost saved by the increase in efficiency does not enough justify the cost of implementation of such a nozzle.While I'm not a rocket designer, I'd hypothesize that it has to do with the cost-benefit analysis of implementing something like that. They'd get more efficient operation, but it would require increased weight, more exotic materials, and (until recently) would only be used once. That's a lot of cost to justify a relatively small benefit.