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Search took 0.00 seconds. Search: Posts Made By: BigCat
Forum: Multihull Sailboats 06-08-2008, 18:42
Replies: 55
Views: 12,145
Posted By BigCat
keel types

In practice, what you actually see is usually that long keels are cut off foils, and daggerboards and rudders are not. This is probably in part because rudders and daggerboards are likely to be...
Forum: Multihull Sailboats 06-08-2008, 16:53
Replies: 55
Views: 12,145
Posted By BigCat
Well, let's see. There is the trusty Marchaj,...

Well, let's see. There is the trusty Marchaj, who says "The trailing edge is of relatively little importance, as it lies in the area of turbulent wake. There is no scientific foundation for the...
Forum: Multihull Sailboats 06-08-2008, 15:33
Replies: 55
Views: 12,145
Posted By BigCat
Designing keels

The drawback to a wide chord is that it takes more effort to push a wide keel through the water. IMHO, you are best off dimensioning a keel as you prefer for other considerations, keeping it no...
Forum: Multihull Sailboats 06-08-2008, 14:05
Replies: 55
Views: 12,145
Posted By BigCat
Keels usually have NACA foil sections

This might be taken to imply that keels aren't usually NACA foil sections, and that isn't the case at all. We are making the plug for my BigCat 65 keel right now, and it certainly has NACA foil...
Forum: Multihull Sailboats 06-08-2008, 12:58
Replies: 55
Views: 12,145
Posted By BigCat
Kelsall vs. Shuttleworth

Derek Kelsall and John Shuttleworth have debated whether you can make enough leeway in a storm to avoid harm from a breaking or very steep wave, by having retracted your daggerboards versus any...
Forum: Multihull Sailboats 06-08-2008, 12:48
Replies: 55
Views: 12,145
Posted By BigCat
Keel lift

See:
Spinnaker Sailing Online Sailing Course = Section 2 (https://www.spinnaker-sailing.com/lessons/keelboat2/k_lessona.htm)

I'd say the lift is probably a bit forward of what they show, maybe...
Forum: Multihull Sailboats 05-08-2008, 22:59
Replies: 55
Views: 12,145
Posted By BigCat
Leverage

The keel is a short lever and the mast is a long lever.
Forum: Multihull Sailboats 05-08-2008, 16:19
Replies: 55
Views: 12,145
Posted By BigCat
Keels vs. daggerboards.

I'd say that the phrase 'closer pointing' is misleading you. It is rather that a high aspect ratio daggerboard makes less leeway if the boat is making good speed, and so make good a higher course (-...
Showing results 1 to 8 of 8

 
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