I'm looking for huge longboard fins to use in a franken-dinghy that I'm building and I hope ya'll might have some suggestions for inexpensive/not awful quality fins. Preferably the most massive fins that will fit into
The deal is:
- I have a small 12' [ply]wood rowboat that I'm setting up for sailing
- Normally one would install some kind of trunk in the middle for a centerboard/daggerboard. That's a lot of work and takes up lots of space in the boat and I'm not into that
- It's totally OK with me if it sails bad or not at all, mostly this is a fun science experiment for me
- I plan to use epoxy putty & glass to attach a pair of longboard boxes to the bottom and then use a pair of longboard fins in place of a center/dagger board
- Of course, windsurfing fins are a thing, but windsurfing boxes (tuttle/deep tuttle/power) are deeper than a regular US/banhe/longboard box and since this is going to be frankensteined onto the bottom of the boat, that's not ideal
- Also those boxes attach the fins by way of a screw through the top, which in my case would be a screw through the bottom of the boat, not ideal
- I also hope to use one of the breakaway longboard fin screw tabs so that hopefully I don't rip a hole in the boat if I ram into a log or beach.
- size. Back-of-the-envelope math suggests that a pair of bigger D-fins will provide a similar amount of surface area to the centerboard that you're *supposed* to build for this boat. Probably the bigger the better.
- strength. These are going to take mostly sideways load because their purpose is to resist sideways movement from sail action. So probably solid fiberglass? Also would be great if they could survive maybe getting crashed into on occasion.
- cost. I have to buy two of these and really don't know if this plan will work at all so buying super-nice fins is probably not sensible. I feel comfortable re-selling them if it doesn't work out, but I'd rather not dump a bunch of $$ into nice fins just to discover that this plan is, in fact, crazy.
So anyone have reccomendations for durable, big fins that aren't too expensive? Or have a pair of matching huge fins they want to sell me?