APC 18 x 8 Wide Propeller

The APC-E Wide range of propellers

The "W" gets a better "bite", which is more suitable for 3D giving you more thrust at lower RPM's, slower speed at higher at RPM's. Pattern and IMAC guys like a narrower prop for the most part, more consistent up and downline speed, smoother transition throughout the flight envelope.We 3Ders want a prop that will let the plane "hang" easier and be more stable in hover and high alpha, additionally more thrust at lower RPM if you will. Better prop wash at the control surfaces with a "W".