Didn't know that it was that efficient - but I guess only when not using the afterburners. Still, if the efficiency of the engine could not be raised much, a mo

Didn't know that it was that efficient - but I guess only when not using the afterburners. Still, if the efficiency of the engine could not be raised much, a modern construction could cut down other operation costs as weight and most importantly maintenance. Also, the whole airframe could be made lighter.