Have you seen the extended monofins that already exist? I saw how much $$ you say you've spent already. These are pricey and not clear, but they have the extension you want and are built, as far as I can tell, with the angle built in that you are trying to achieve. I thought it was a great idea for lengthening a tail, looks similar to the fluke mechanism that they show built in the H2O tail making videos on YouTube. The only additional costs are cycling shoes ( I think) to fit into the fluke. That makes them comfortable to wear. I'll attach a link to the ones I've seen online. If you don't have to spend so much time engineering and building practice models- it may even save you money in the long run. Anyway, just trying to help in case you hadn't see these yet-
This one is $$ but
https://www.deeperblue.com/dol-fin-p...ng-completion/
Here's the one I first saw, looks good-
https://www.ultimateswimfin.com/
and one more page for the Lunocet
-http://freedivewire.com/freediving-fins/
This site has a diver comparison to both models pros/cons
Maybe this can help you in your quest!
Building a monofin that's extended will take a lot of time, trial & error, & material to build one from scratch. Not that I'm not for releasing the inventor in all of us- but, I know how hard $$ is while you are a student! I hope you won't be offended with me suggesting checking these out.. I am truly just throwing it out there if you hadn't seen them
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