Want to hear an anecdote? OK:

When APC props first surfaced & info about them was chaotic, I decided to got to the mfr for the straight skinny. So I called Landing Products and the guy (one of the designers). I asked him about the design parameters. He said, " We carried the pitch closer to the hub than you can with other materials. That's where the increased loading and lower static RPM comes from." When I asked about the tapered tips, he said, "That was for noise reduction and looks." Honest, that's what he told me. Might get a different story now.

Folks, you may remember that APC props became known to the mainstream modeler through the AMA's noise source investigations. Pretty soon APC props were the THING!

CR