best prop for 180/sig extra
bpu699
Don't even bother going with the 16x10 it will only make your condition worse. Granted you will be able to build more speed but you will loose it quicker on the uplines. Using the 16x10 would be like putting your car in 5th gear to climb a hill, it just doesn't make sense. If your looking for true unlimited vertical your best bet is going with the largest diameter prop (18") and shallowest pitch (6") you can obtain while still keeping the plane happy at level flight and the motor in it's powerband (~9,000rpm). One variable that will make a difference is the brand of prop. Blade width and contour affect thrust as well, I think most people would recommend either a Zinger Pro 18-6 or APC 18-6w.