Excellent. I’ll be watching this one. thanks for putting this up.
all the best
Thanks Greg, a quick look thru the archives showed this thread…
http://www.swaylocks.com/groups/surfboard-and-fin-hydrodynamics-swansea-university
And the mentioned Chris Cochran thread is here… http://www.swaylocks.com/groups/naval-architecs-perspective-foils
And the only fin flume photos I can find are these few…
Finished the fin holder and collecting as many fins as I can for testing. I think it’s not going to be about all the same template fins but looking at all the variables.
Looking good. Like your idea.
Have you looked into Computational Fluid Dynamics? In short it is a computer system that allows you to enter your fin outline and different NACA values to study the interactions between surface and fluids.
Dave
Hi Dave, thanks for the fins a while back.
Ive lost faith in conventional NACA foils because surfcraft fins operate at wildly variable speeds and angles. Whereas the NACA shapes are all about lift and basic variations on a single theme. So I built the Flume to test all sorts of shapes not just 4.5" high dorsals.
You must’ve seen or built a few unique fin designs over the years ?
As an undergrad, I worked in an exercise physiology lab, where the prof swam turtles in a plexiglass flume. Don’t remember the speed of the flume, but this brings back memories. If only I were interested in fins back then.
I second the idea of attaching string to the fins, like tell tails on a sail. You could use plastic ribbon and glue them on easily.
Certainly Tell Tales are going to happen , along with the fine bubble trails. Should be a lot of fun just working through the decision process and then analysing the results.