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Just say no A couple realistic good posts from CT. The world has always had too many sailboat classes and probably too many development classes too. How many 2 person one design classes are there in the world? That would be an interesting list. Most sailors, perhaps excluding this list...

C-Class wing design I have only gotten to page 19 of this thread, but since wings are a current topic I thought I'd jump in. Apologies if I'm repeating recent content. In message 104 of this thread Tom Speer has three charts dealing with the optimum plan form for a sail. You can always...

See, the boat was so boring they had to add foils to make it challenging. Or, sailing without a spinnaker left them so off the pace they needed the crutch of foils to keep up. Actually, don't take me seriously on either of those statements. Like gggGuest, I'm not sure I'd want a spinnaker on...

Fixed sail area I didn't mean to get anyone excited when I made that comment about fixed area sailboats. I guess it will sound like I'm denigrating every boat I mention, but I'm not saying a single one is less than a great boat. Moths are certainly killer performance extreme boats, but...

CT, It's tough to read intention without facial expression and intonation. Harder still in short posts, and nobody reads long ones. I think a lot of flame wars would be avoided if everyone started out knowing each other, but it would sure cut into the trans-hemispherical conversations. As...

Tongue in cheek CT, Was Voltaire picking on the multi-hull, or mono-hull sailors? It couldn't be me, because I wasn't the one that said that. Or, are you just pulling my chain? I think I fall for that every time. I intended that quote, like the whole post, to be completely tongue in...

Low tech Ha! Look at that sail plan and compare it to BMW-O. See how much lower the aspect ratio is? That is because it needs lots of power and the associated drag is less important. That only happens when the hydro-dynamic drag goes up. Of course I'm completely ignoring design wind...

Terry, I did wade through all the posts and I think you covered all the high points on what needs to be accomplished. I think I am agreeing if I say that in the early pages people were misapplying aircraft stability concepts. The system has to be active when you are using a submerged foil...

The American AC perspective I started following the America's cup as a kid of course and lived around 100 or so miles down the coast from Newport. In 1970 I was helping sail a boat from Maine to Connecticut and we spent a night in Newport harbor while the 12 meters were there for the 1970 cup...

This will probably disappear, but until then, enjoy these comments made by a Frenchman about our forum. ----------------------------------------------- He seems to go through phases, but when he's feeling politically correct he says things like: - Love truth, but pardon error. -...

+1 Makes sense to me. For displacement craft and all boats it seems, the primary determinant of speed seems to be length. I think that is the best single limit for an open class. Still, a length limit might force a type, although the type it forces might depend on the length selected. At...

A reasonable goal for a peoples foiler would be user complexity equal to the original laser. I have to think the launching and assembly would be complicated by the foils, so it seems like you have to be very resistant to anything that complicates the boat. Rather than the lowest takeoff speed...

Gary, I should have probably known, but I hadn't seen your boat before. It looks incredibly cool. Is there a web page? I find myself wishing I lived on the other side of the world: Both East to West and North to South. I have heard that we do have some A-class cats in Colorado-USA...

If you cut off the end square, well yes I think you could say that more tips means more drag. The foils being made now though have carefully shaped tips, so I don't think you would have drag from disturbed flow around the tip. It may be that we are talking about tip loss, which would be...

So in comparison between the two boats it seems clear to me that the induced drag for the cat is close to twice that for the monofoiler. As is surface piercing drag and spray drag as you suggest. The foil loading does not give you the induced drag. You can have a huge range in values for...

You could do that, but a People's foiler wants to be simple and a Moth, for only a Kilo-buck, would have two completely different foils to optimize for the two different wind ranges. On the other hand, there has been some question if you can change your Moth once the regatta has started and...

One more pitch for complexity: If you can lift and lower the windward DB and lock it in position, you could fly level on the leeward foils alone. Peter Raymond

Doug, to calculate induced drag you would like to know load and span for each foil. If you cut the load in half and scale the dimensions to have the same foil loading and the same aspect ratio, you will also cut the induced drag by half. So there is no reason for the cat induced drag has to be...

Maxi's S-H is Southern Hemisphere, is Southern Ocean, is the roaring 40's? Rules would be a problem. If I knew the cup would be in Valencia and I were the defender, I'd race a boat in the maxi series I knew would lose that series and just barely make it through the tough sections under...

What's next? SF The latest press does make it look like Larry is really aiming a SF for the next cup. Space was the big question and he talked about Treasure Island. I can't though see a significant building project making it through the litigious US system in time for a contest on a...