Originally Posted by bobperry
A couple things I should add;
I owe the success of the Islander 34 wing keel to Dave Vacanti. I hired Dave because he is an expert in foil performance and a buddy of mine. Dave did the geometry and foil choice for the 34’s wings. I’ll take the credit for the design, it’s a great one but Dave gets the credit for that wing keel. Google Dave Vacanti.
You can’t put fat, stubby wings on a fat, stubby fin and get good results. You’ll get fat, stubby results. You can’t put a fat, stubby bulb on a fat, stubby fin and get good results.... For fins and wings to be effective they need aspect ratio. The problem is that Mom and Pop can’t live with long, thin, bladelike wings sticking off their keel. They are just not durable enough. So the designer or builder has to compromise. A highly compromised set of wings may help you lower the VCG of the boat and reward you with decent stability in a shoal draft situation but it will not give you the lift you need for speed to weather. There are no magic bullets in keel design.
Bob, It seems we are talking about a very special keel with foils as wings, not the typical mass production keel. It seems very interesting. I would like very much to have a look. Can you post a drawing?
Yes, I found out very interesting "stuff" by Dave Vacanti. Interesting read. Thanks!