I used an APC 13x6 prop on mine with a TH 75. Never tried a 14x4W prop. The APC 14x4w prop is their 3d or "funfly" prop. Wide flat blade. You can typically go up one inch in prop size because of the lower pitch. You can try it, but those that have did not like it because the plane flew so slow. You may get a little better trust for hovering, but everything else will suffer. I use the low pitch props on my thick winged profile planes. Everything else uses a minimum of a six pitch.