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I am curious Mikko Brummer and others, after 15 pages did you get your questions answered? The circulation theory of lift is a mathematical explanation of lift and how it is generated. But the actual lift is a real world example of the math. Yes, you would experience the wind shift as...

The following is copied from Homebuiltairplanes.com in response to posting the above referenced (post #7) video on birds. Still more airplane than boat applications but at the very end there are links for the Trampofoil and Aquaskipper that are manpowered hydrofoils using the foil for...

More aircraft related than boat but still of interest: Would planes be better if they were more like birds? https://stories.rvc.ac.uk/eagle-inspired-engineering/ Would planes be better if they were more like birds?

A 3D-Printed 'Fish Fin' Offers New Ideas for Morphing Aircraft https://www.techbriefs.com/component/content/article/tb/stories/blog/39887

Thanks for explaining how things work here. This is a sideline for me but I will give it a go. Here are videos of a few simple systems. Norwegian researchers are doing studies that I found interesting. In searching for a recent proposal I found this but it is not the one I was looking for...

Gonzo, You may want to look into the Dol-Fin for work in high current environments. It is sturdy and built for speed and efficiency.

There are reasons why the longer low aspect ratio free diving fins can be more efficient than the typical shorter fins of SCUBA and Snorkel divers. The answer can be complicated and beyond the scope of this page so I have started a new thread for any that may be interested in a more detailed...

I am relatively new to this site but have noticed that this Propulsion Forum segment does not have a segment devoted to what may be considered non conventional marine propulsion systems, an example of which is listed below. Caudal fin propulsion is is one of several biologic propulsion...

I am not sure what your point is here. Much of what you say is true. No problem with the statement "A swimmer with more available power will benefit from a fin that can deliver more power. However, a weaker swimmer will go slower and tire faster with the previously mentioned fins." As for the...

Others have pointed out the power versus efficiency reasons for fin selection. There is also the issue of fundamental fluid dynamic principles of wing lift versus wave form thrust as demonstrated by eels, snakes and skaters. There is a high aspect ratio dive fin that has good performance, and...