Something I had not thought about, but which explains my failed ply and glass foils

I was thinking about foils for my Blade. Could you just make a "boot"? Slip on slip off?

I did not quite understand the question. You consider new foils for your Blade, that I got. But where are the "boots" to go? Outside the current foils?

Attached to the rudders, anti-pitch device.

You could do it, but I think that would be more work than doing a custom set of rudders with the T foils.

So, what about the design of these T-Foils?
1. Symetrical, can they be fairly flat?
2. Near the bottom of the rudder.
3. How much surface area?
4. Triangle shaped? Rectangular? High Aspect?
5. Zero angle of attack with boat level. When is the boat level? Or zero when the transom is just clear of the water?