Keel design issues

[HeloDriver]

"So the way to design an efficient keel is #1 to make it as deep as possible, #2 size the area to provide an adequate reserve of leeway angle to handle down-speed conditions like tacks but still keep the upwind leeway angle high enough that you haven't added excessive wetted area, and #3 pick a section that's consistent with your operating condition. But #3 is way down in importance to #1 and #2." - Tom Speer
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Tom,

I am dealing with a situation already at the limits of #1 & #2, and one where the trailing edge at the root is blunt (1/2 inch minimum) due strength and physical limitations (swing keel). The trailing edge may then transition over four feet of span to a 1/8" or less at the tip. It's somewhat frustrating evolving a descent shape with these constraints. -RW