It is a scientific fact that bright yellow fully vented split jet fins are the best! 
Vents on Jet Fins?
- Thread starter Eric Sedletzky
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justinthedeeps
Contributor
Is anyone actually using JetFins for single-tank diving? How about some lighter RK3's at least?
Is anyone actually driving a twinset or CCR with freediving fins for "greater speed"? Isn't that what DPVs are for?
Is it true that if you drill any drain holes into the toe box of the JetFins (for shore diving exits) that it totally ruins the ostensibly masterful fluid dynamics of the design?
Is anyone actually driving a twinset or CCR with freediving fins for "greater speed"? Isn't that what DPVs are for?
Is it true that if you drill any drain holes into the toe box of the JetFins (for shore diving exits) that it totally ruins the ostensibly masterful fluid dynamics of the design?
Robert H. Diver
Contributor
I switch between jet fins and RK3 HD’s when diving dry and a single steel cylinder.
I've only ever owned and used Jet Fins. I purchased mine new in 1987 when I was certified. Very common fins here (MO and AR) for local diving.
ETA: We're in full (two-piece), cold water wetsuits if diving deeper than very shallow. Some people dive drysuits here and dive through the winter.
rx7diver
There used to be a very active SB-er who did very deep dives off Florida, dressed Hogarthian in manifolded Al 80's and slung Al deco cylinders, pushing a professional-level video setup, chasing fish. He swore by DiveR freedive/spearo fins.
rx7diver
OP
Eric Sedletzky
Contributor
OP
Eric Sedletzky
Contributor
What are RK3’s?
Lot’s of people use Jet Fins for single tank diving…all the time.
My original question was why the vents and how do they work?
I looked at the vents and imagined a downward stroke. What I saw was a lot of water passing through and not doing much.
But hydrodynamics is a whole science so I’ll leave it to the experts to explain.
Robert H. Diver
Contributor
Google Apeks RK3……
In the Spring of 1967 I was "hired" by Sam Davison -- a.k.a. DACOR -- to consult on a new fin he'd developed...his answer to the Jet Fin. It also had vents, but were sufficiently different (I don't remember how) from those on the Jet Fins to avoid patent issues. The fin was a two-part fin...the blade was a rather stiff polymer, the foot pocket was rubber, all nicely molded together. I was a brand-new PhD in hydrodynamics who had taken a scuba (DH) class in college. My contribution was to go to a swimming pool with him and observe some swimming trials of several divers with the new fins, Jet Fins, and some others, and to try and explain any differences they felt in using them. Terrible experiment, no controls, totally inconclusive results. My opinion was that there was more difference caused by the several kicking styles than by the fins themselves. He didn't like that, but thanked me and bought me a hotdog for payment. He also used his "use of a PhD hydrodynamicist" as a selling point in some of his advertising material later, and there was even a story about it in Skin Diver magazine at some point. Years later, I bought a pair of the fins; they were pretty good and I used them for a long time. I liked them much better than Jet Fins, mostly because the foot pocket was more comfortable and the fins were lighter in the water....just like Eddys.
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