More than 20 years ago Prof G Hoppe was approached by the South African Defense Force to help them with a patrol boat that they needed to get more performance from. This catamaran hull used on the patrol boat required large engines to perform and was still to slow.

How it works:
More than 20 years ago Prof G Hoppe was approached by the South African Defense Force to help them with a patrol boat that they needed to get more performance from. This catamaran hull used on the patrol boat required large engines to perform and was still to slow.

Hydrofoil Lift:
For the purpose of illustrating how the foils (wings) work the figure shows a deep-vee hull as it would lie in the water. The main foil is positioned so that it will be on the waterline and at the best angle of attack for maximum lift mid ship. The rear foils (wings) are also positioned so that they are on the waterline at the rear of the boat for lift and stabilizing the boat. The figure also illustrates the level of the water at rest and at speed.

Pontoon Hull Illustration:
In the second figure using the same criteria but assuming that there are two separate deep-vee hulls, illustrates the positioning of the main foil and the rear foils on the inside of one of the pontoons or hulls.