I guess I need a Nelson 40 and a 9x9 too.

Anyway, a 13x6 prop creates significantly less thrust in a hover (static) than does a 14x4W at the same power level. I'd honestly guess a pound to a pound and a half difference. The "W" props are stump pullers.

The thought is that in order to hold the plane, you then need more rpm. More rpm plus the 6 inch pitch means the air over the tail is moving faster, and it COULD help to stabilize the plane in various attitudes. Heck, I'll try anything once... Or even twice if I like it...