fourlocks wrote:
Amazing to see that many (flying) B-25's together like that.
As for the A400, why the 8 propeller blades? I'd been taught that fewer blades = more efficient. With too many blades, each blade is trying to pull through the turbulence created by the preceding blade. Or doesn't that count at high speed?
It probably takes that many blades to absorb all that power.... from the "Aviation Pros" website... "Driven by an 11,000-horsepower engine, Hamilton Sundstrand's FH385/386 handles twice the power of any existing in-service propeller and offers a thrust efficiency peak close to 90 percent at high cruise speeds. Each wing features a pair of clockwise and counter-clockwise rotating propellers, which enhance overall aircraft stability and control, and further contribute to overall operating efficiency."