Where would the intake contribution to the +47% come from? ie not the fundamentals of where intake thrust comes from, but specifically what would have caused the change.
eg would it have been from upsizing the intake to handle the +22% engine flow and hence a greater area of rear-facing surfaces?
Difficult to say for sure without knowing more of the intake characteristics [I'm looking for something that might explain it ]
AS A GUESS, from the fact that it was an
installed thrust improvement, it could have been that at Mach 3.0 the intake was actually too big for the engine without bleeds, so that they may have been spilling air through the forward bypass doors (to maintain the normal shock in its correct location). This air was spilled out sideways so no thrust recovery - just momentum drag. This could have been the case if they originally sized the intake assuming the engine would swallow more than it actually would without those bleeds or because the intake was actually sized by some other design case and they had to compromise a little bit. With the increased engine mass flow possible with the returned bleed open, they could keep the forward bypass doors closed.
One more question to add to the list .....