Thanks Gary.
I'd love to see a 3.5" version of this. Probably have to build it scratch though - kit makers generally don't like the curves in the fins. It adds a lot of hassle for them on the manufacturing side of things. Straight fins are easy - a couple of simple cuts and perhaps a quick pass on a disc/belt sander and they are ready to pack. Those curves take more time and/or special jigs & templates - a few extra steps at the least. And they end up with more waste. And then once the customer gets the kit, they find that airfoiling or rounding curved edges is much trickier and a few folks at least are sure to ruin them, perhaps getting upset with the kit maker (unreasonably yes, but some will inevitably do it). There is a reason why just about all fibreglass kits come with simple, straight lined fins.
On the other hand, it really isn't THAT much of a big deal to do. There are certainly ways to maximize efficiency in any production setting. Any good manufacturer could design a system that would work just fine. It's just that a simple straight sided delta shape will always be cheaper/simpler/easier to produce.
For my money, a couple of simple curves make all the difference in the world. But I can understand why a kit maker/manufacturer might not go there.
Maybe though? waddya think Tim?
s6