Need to get a 17" APC prop for my Saito 180 on my Chip Hyde Cap-X... I was looking at the APC site and they have a 17x4 3D fun Fly, they also have a 17x8N Pattern or a 17X6...I was told my a few experienced pilots to go with this "new" 17x8 prop, but what about this 17x4? What is the difference, is there any reason to choose one over another? I think what I am asking is for a little edgumakatin on prop sizes...