It follows a nice article published on August 18th on www.spacedaily.com -reproduced by the blog BrazilianSpace- about the RS-25 rocket engine. The article highlights how complex a rocket engine is in comparison to one jet or car engine. Indeed, it considers that the RS-25 engine makes modern race car or jet engines look like wind-up toys.
RS-25 ENGINES: MEETING THE NEED FOR SPEED
By Staff Writers
Houston TX (SPX) Aug 18, 2015
Rocket engines are among the most amazing machines ever invented. That's mainly because they have to do one of the most extreme jobs ever conceived - spaceflight - starting with escaping Earth's deep gravity well. Orbital velocity, just for starters, is over 17,000 mph, and that only gets you a couple hundred miles off the surface. Going farther requires going faster. Much faster.
The RS-25 makes a modern race car or jet engine look like a wind-up toy. It has to handle temperatures as low as minus 400 degrees where the propellants enter the engine and as high as 6,000 degrees as the exhaust exits the combustion chamber where the propellants are burned.