True Round hull
vs a
Double hard Chine Hull

There has always been a debate as to which type of displacement sailboat hull is faster, a True Round hull form or a double hard chine hull form?

To have an fair and equal race evaluation between such vastly different sailboat displacement hull forms you can not just race some guys True Round steel sailboat against so other guys Double Hard Chine steel sailboat.

To answer that question you would need two sailboat designs that are very closely related to each other.

To this end, I converted a steel thirty-five-foot, Double Hard Chine hull that I designed for an assignment while attending ‘Westlawn Institute of Marine Technology’ into a True Round Design.

Converting that Double Chined Steel design to a True Round design is a story in itself. At that time I was only interested changing the estitics appeal of a Hard Chine Design

The below first two links detail some of the conversion process, while the third link shows the results of the race.

Conversion Process

Displacement-Coefficients-Stability

Velocity Predictions

The following sets of Renderings illustrates the dramatic results of that conversion using the Author proprietary method ‘Bezier Design and Construction’.