Far simpler to produce and engineer.

This system is fully selfsteering. In effect the setup can be as simple as putting your daggerboard cases under an inward angle and using the same daggerboards as before. This is especially welcome on beach cats. Only additional modification is a T-foil rudder system when you want to go full foiling. If you are only intended to do partial foiling then you can continue to use non-T-foil kick-up rudders.

When longer daggerboards are used then the height of foiling can actually be set by pushing the boards further down or pulling them slightly up. Again, no moving parts apart from the boards itself sliding up and down. In effect this is an inmensely simply system to produce and maintain.

When speed increases then the boat is lifted higher above the water surface, thus reducing the wetted area of the foiling board. The excess area is moved out of the water into the much less dense air. This means that the angle of attack of the board is also a selfregulating system it will pretty much always operate at an optimal angle of attack. In T- shaped foil systems the angle of attack must be changed actively (want system) to stabilize the boat in height. This means that when the speed is increased the T-foil will operate at less efficient angle of attacks. Bruce foils do have added drag of the spray they throw up but it is not certain that is less efficient then an T-foil operating at a sub optimal angle of attack.

The bruce foil system itself will react to waves and such without any additional gear.

Bruce foiling is more efficient in conditions that don't allow full flight. This because the foil itself also acts as the daggerboard, resisting sideways slip. It may well be engineered as a pure partically foiling system, where always less then 100 % of the weight is carried by the foils. This helps increase the top speed when there is sufficient wind and maintains sufficient light weather performance.

It is my personal opinion that full foiling is still too much like a single gear race car to be a winner over a full range of conditions like we see in windward-leeward bouy racing.

But I'm happy to be proven wrong by anybody. So guys who is up to building a full foiling catamaran under a fixed rule system and race it around the cans in a few different wind strengths.

The bruce foiling guys has already done that See picture.





Wouter