Here's something I've been developing: a below-hull feature which increases stability significantly, allowing for the use of much narrower hulls, and significantly more speed. The picture is a very narrow Surfski - something I couldn't even sit on without tipping before the addition of said feature. It's kinda fun to cruise at what is currently considered race pace. Now perhaps boat designers can toss the notion that width=stability when designing canoes, kayaks, and SUPs.

Sorry, international patents are being filed so I can't furnish pictures of the design yet. Rest assured it's unlike anything you've ever seen.