Aquarius Sail Owners

havliii, I'm sorry our discussion fell off the tracks. Some of the words I used were for emphasis to explain what was happening in the video as I saw it. I also used some of the laws of physics. If you have any questions or further interest in what you saw in the video, I suggest you do the "to...

havlii, We, you, are talking about a physical impossibility. There is no force that will make a sailboat crab to windward. The side force in the sail can only make a sailboat crab, slide, to leeward. The video of the SC17 appears to show it crabbing to windward which is a physical impossibility. In ...

havliii, I looked at the video at one minute. What I see is a wake aimed off to leeward of an extended hull centerline in the aft direction. This means the boat is working its way to windward, to windward of the way the boat is aimed ,at a large angle. WOW, this boat is sailing to windward like craz...

Dan, Looking at your first post, there is nothing wrong with your jib sheeting system. As a matter of fact there is an advantage. When you play the mainsheet sailing to windward, for example, there is an advantage. As you ease the main a little in a puff, the boom moves out some and you ease the jib...

Part 1: Technical Discussion Square top mainsails have been around for about 30 years, first showing up on beach cats in the mid 1980’s. Prior to this most mainsails came to a point at the head of the sail called a pin head. Now square tops are showing up on high performance monohulls. This major c...

It is true that propulsion forces equal drag forces at terminal velocity. It is true on sailboats and race cars and airplanes etc.

I'm lost.

Dan, I'm sorry but you just have a bunch of junk sails and you don't have a sailmaker around who knows how to fix anything. The leeches on roller furling sails flutter. The battens parallel to the luff help and undercutting the leech 8 ins or so helps also. But a roller furling jib is a functional c...

Dan, I just read your first paragraph and I think I see the problem. Both parts of the jib sheet through the boom barber hauler. A, one, bullet block won't do it . Both parts of the jib sheet should go through the boom barber hauler point. If you don't like the ring, use double blocks to reduce the ...

Dan, I don't see the problem. ON the clew corner of the jib you have an adjustment plate that let's you vary the vertical angle of the jib sheet coming to the sail. This let's you vary leech tension/foot tension. Then you have a barber hauler system coming off the boom that let's you vary the athwar...

havliii You lost me when you said drag equals lift. Drag is the force resisting forward motion of the boat and occurs along the path of the boat through the water. The lift we are talking about is perpendicular to the path of the boat and they are NOT equal and are almost totally unrelated. Here's a...

havliii, Yes, the angle of attack of the water on the board is the leeway angle. Many, many one design classes of sailboats have tried adjusting the angle of attack of the board in the trunk to the slip angle. No benefit has ever been found in any class. This tells us that there is no measurable cha...

The driver of this train is sail side force. The boards automatically adjust and generate an equal and opposite force. The peak lift to drag ratio of the boards occur at a small angle of attack like 3 to 5 degrees max. Sailors can keep the boards operating at or very near peak lift to drag ratio by ...

Dan,
I prefer Fresco sail colors also, cool colors.

havliii, When the boards are at or near stall, increasing the board area underwater will reduce the load per square foot of board area and this move the board away from stall. Stall occurs when the load is too great for the amount of board that is down at the speed the boat is going. To move away fr...

havliii, you have it backwards. At stall, boards need more area. When your boat is sailing at 3 knots into a 9 knot current, you have 12 knots over the boards. They are happy. They are no where close to stall. The only speed that matters is water speed over the boards. The boards don't know when the...