I dont really see why they would? because this is per fuel burned not maximum thrust
it makes sense that the most efficient point would be the lowest possible speed it can sustain due to the drag exponentially increasing with speed due to having to decelerate the air to subsonic velocity
In a turbojet, perhaps, but Ramjets work differently though. They have to be moving forward to scoop up the air. If they arent traveling fast enough, they’ll actually loose thrust, but not necessarily burn any less fuel
And that’s what it shows on the graph? At the same speed, the lower the thrust specific fuel consumption, the better the fuel efficiency. The graph shows ramjet fuel efficiency only matches turbojets at around mach 4, and it’s 2 times worse below mach 2.
Its been a while, but it was either from DGA people or Marketing material. But the OSF was said to be possibly used to target/detect low visibility aircraft. And could be used to spot targets at long range through IR frequencies. And i was wondering if more advanced versions of irist were planned additions in the game ?