Comments;
1. One of the major improvements on the P47 (D25 on, I believe) was
the paddle blade prop. made a marked differnce in climb and
accleration and some in top speed.
2. The P51 from the start used energy revovery - engine heat
'energized' the cooling air which was efficiently exhausted from the
ventral radiator and thus recovery thrust just about canceled radiator
drag. About a year ago 'Air&Space' mag had an article by one of the
designers on this subject. Odd not many other designers (Republic
Rainbow - F12; Convair 240/440/T29) went this route.
Walt BJ