The engineers were Richard E. Hulten and Roger D. Holm, and they took their project very seriously. They incorporated themselves as Hulten-Holm and Company, rented a large garage space in Pontiac, Michigan, and bought a new Loadside from Mathews-Hargrave Chevrolet.
The first order of business was developing the water propulsion system and steering mechanism. They settled on twin propellers mounted behind the rear wheels and twin electrically-operated rudders.
A new undertray was moulded from fibreglass to ensure that the Corphibian would be as hydrodynamic as possible, and completely water tight. The rear of the Loadside was extended by 2 feet to accommodate the hydraulic reservoir and motors that turned the propellers via a belt system that was developed in-house by Hulten and Holm.
In order to provide control for the rudders and propellers the two men bought off-the-shelf powerboat supplies including a hand throttle. Steering is accomplished using a toggle switch that moves the propellers, and the craft is capable of normal speeds on the road, and a few knots on calm water.
Although a lengthy test program was completed with the Corphibian it mostly took place on the water – testing for stability, speed, load capacity and water entry/exit. Some of this testing can be seen in the original Chevrolet footage below, it actually loom pretty stable in the water to me and it’d likely make a handy lake boat for fishing considering the fact that you wouldn’t need to mess about with trailers or winches.
It’s due to be sold through Mecum on January 15th in Kissimmee, Florida – there’s no listed reserve or estimate and it’s difficult to determine how much it could be worth. But I guess we’ll find out in a couple of weeks.