I am looking for data on the hull speed one can expect on high aspect ratio
(narrow) hull.

I want to build a motor canoe propelled by a 1.3 HP Honda 4 cycle with chain
reduction drive. The boat will be 4mm ply with about 17 or 21 feet of
waterline.

I know that narrow hulls exceed the standard hull speed formula. If this is
really significant, I would go with a 14" wide outrigger design versus a
monohull.

Thanks for any formulas or links.

Robert Haston