 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
 |
|
 |
|
 |
|
 |
|
 |
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
HOW IT WORKS
The patented hydrofoil system contains a retractable, inclined daggerboard (Bruce foil) in the forward part of each ama and additional foils at the stern of the amas. The final foil is mounted on the rudder. At boatspeeds of above 5-6 knots the horizontally mounted rudder foil comes into action, minimizing back wave, and associated drag at the stern of the main hull.
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
As wind strengths increase, the hydrofoil system comes into full action. On any point of sailing, other than running downwind, the Aegean Catri 27 is supported primarily on three points: the rudder mounted foil and the two leeward ama-mounted foils. The V shaped bottom of the leeward ama skims the water surface, minimizing drag (and thus maximizing speed and efficiency). Lift to windward (prevention of leeway) is provided by the forward ama-mounted hydrofoil (being angled at about 50° to the horizontal, it provides both horizontal and vertical lift).
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
The forward mounted daggerboards are asymmetrical foils which are intrinsically much more efficient at providing lift than a conventional symmetrical centerboard: thus, the windward performance of the Catri is exceptional. The leeward ama acts as a powerful water surface sensor, ensuring that the rear foil is always correctly angled to the water surface. There are minimal moving parts (except for raising and lowering the forward ama mounted foil, as you would with a conventional centerboard), and the hydrofoil system is largely self-tending.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|