- Mar 24, 2009
I would like to add one point. Rocket engine is in a sense use and throw. the are not reused much (it at all they are reused). Jet engine needs to be made available on an average for 8000 hours. This makes jet engine a difficult technology.Just look at China, with a much serious sanction imposed on her for almost 20 years, she still managed to continue her rocket program. But with a much better environment from 1980, it took them 35 years to a indigenous jet-engine ready (still with foreign concept and techs). On top of that, we have to add on 20 years effort of reverse-engineering Soviet old engines prior to 1980. What this history tells us? Developing a modern jet engine is much much more difficult than rocket and rocket engine. Even Iran, North Korea can development their own rocket in house.
Jet engine has to sustain thermal stress, mechanical stress and metal fatigue for a large duration.
Jet engine also have to be light, have smaller and moving components.