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 general estimates only.. Proven boat designs, and how-to information for boat building. boat plans are for beginners and have been built by thousands since 1953.. Walkabout l o a 5m; 16ft 2in beam 1.5m; 5ft weight (approx) 92 kg; 200lbs sail area 7.5 sqm 80 sqft.