In association with The Vintage Hydroplanes The Vintage Builders Guide Part II

These builders all contributed to the different styles and looks you see in vintage hydroplanes. These gentlemen would make hydroplane modifications, adding, subtracting, moving and refining the many angles that grace these racing machines. Another item worth noting that these men were also very good boat racers. This on-hands experience I'm sure attributed to the many major and minor distinctions you see between the different names in the hydroplane raceboats.
Using experience from racing and testing, they would try to improve and build into their designs any hull requirement they thought would be needed to win. Changes and  modifications were construction techniques, different framing types, fastening systems, plywood thickness selections, driveshaft angle, and motor placement. I'm sure many of the driver/owners were also pitching in their 2 cents worth with reports on water conditions on the different courses in the regions. These handling characteristics of the different hydroplane designs and the new changes would spread between the racers. All these new changes eventually evolved into hydroplane hull styles we see today.
Look closely at vintage hydroplanes. Other than the major discrepancies among the different hydroplane builders, you can see very subtle variations. If you attend a vintage raceboat event and see them sitting in the pits side by side, these differences can be quite noticeable, even to somebody who may not specifically be looking for them. There lies the beauty of the different designs we see from one designer to the other. But with so few of these hydroplanes that have survived to this time today, photographs can be the only evidence in quite a few instances where people are trying to document or acquire a rare piece of racing history.
The 3-point hydroplane hull itself (if you can imagine the raceboat without its sponsons attached) has been described as to an aircraft wing. The upward slope of the bottom towards the nose provides the lift needed to plane the hull above the water and on a cushion of air. Hence the name hydroplane. These are basically low flying aircraft with a flying ceiling of a few feet.
The top deck shape would be the equilibrium providing enough air pressure resistance to keep the hull maintaining its altitude especially at the higher speeds. The sponsons are the pontoons mounted to each side of the hull which helps keep the hull balanced as it crosses the water. The propeller, as on a airplane, provides the thrust to keep it airborne.  The term 3-point hydroplane derives from the actual contact of the hull to the water once it achieves enough speed to plane the hull on the cushion of air. The 3 points that the hydroplane balances on as it skips across the water being the first point of contact, the propeller, and the other 2 points being the ends of each sponsons. Interesting enough, decades went by while boat racers kept trying to increase speed by increasing horsepower to overcome the friction of the water. There isn't anything built by man that achieves what the hydroplane performs as it skips across the water surface.
The combination of all these principles becoming the unique experience we see when you view one of these incredible craft. The sound of the open headered, inboard engine, coupled with a high flying hull, and add about one ton of water being displaced into the famous roostertail behind these machines puts them atop anything I have ever experienced. The sheer eloquence as they twist through a turn and the edge of the sponson kicks up another roostertail has to be seen first hand to be appreaciated.
The hydroplanes throughout these pages are the feat of engineering achieved its rich history. Quite an acheivement considering the lack of computer modules that could have spewed forth some of that information today.