B52 is 50+ years old, and a (planned) upgrade thats been floating about is to high bypass engines. Dont they use turbojets instead?Same goes for the concorde, it used turbojets as well. 50's tech. and i dont know what you mean about the horses, but hp ISrelevant to efficiency.
http://www.concordesst.com/powerplant.html
edit:TF33 PW low bypass engines, I stand corrected.