How fast does it go? for estimating the speed for small outboard planing boats see planing speed boat chart. this chart should be used for. Support mike for maintaining the index. paypal: indexes now updated by mike report bad links or send comments to mike: about me. N class modified class – 225ci div. 2/regular 225ci (thru-’75) 4 & 6-litre | cq class 6-litre (canadian) bolam’s express n-22 225 class hull with 229 chevrolet.