ORIGINAL: KC36330
ORIGINAL: B.L.E.
200 mph pylon racing planes might use something like a 7x9, 8x9, or 8x10 or something close to that based on a bunch of eperiments. These guys often carve their own props.
most use an 8.8x8.75 but they aren't 200mph, those rumors seam to fly all over the forums 160-170 is ballpark for the Q40 and quickie 500s. the only 200mph quoted planes that actually were able to fly that through the trap were turbine driven jets, all those pylon racers and delta wings seam to loose roughly 40mph when they fly the trap for some strange reason
kc
I'll take your word for it, still, thats a pretty long pitch for a prop of such a small diameter.