I think we both agree that the wings on a plane however are a very different case than a pair of fins. Dragging someone behind a boat would give the same sort of foil proof of concept that the manufacturer's claim of "works like a plane" would be equivalent to.
A plane has wings but also has engines. The engines propel and the shape of the wings doesn't change much. In the case of the fins mentioned, if they were to work the same way a plane does (and as the person claims), the diver would have to put rockets on his back and let his fins merely act as pure foils.
Sure airplanes have engines, and the engine uses airfoils known as propellers and turbine blades at the correct AoA to generate airflow and therefore thrust. This is same application I am talking about.
Listen, I don't need you to shed light on this topic for me. I fly airplanes, do you? In point of fact, you told me exactly nothing I did not already know.
I asked a question of someone who made a specific claim and I wanted to hear the answer from that person --not you. Are you, perhaps, one of those people who doesn't listen to others talking because you are too busy thinking about what you are going to say next? Just wondering.
And the questions you asked of the OP had already been asked--if you had read the entire thread you would have seen that. Believe it or not, you are not the only person on this board with knowledge.
Jeff
to you I apologize, I was interested in debunking the bogus marketing claim. As for OP, we (ie the group) have asked the same questions more than once but yet, he has not answered them. I hoping to return this thread to the intended purpose and off the hijack angle that it has taken