A vortex?

[TONY CHANEY]

OK, I'll try to explain my other post. I started out with paddles. I would develope cramps on those ling dives. Also, used the paddles in DM class and the tired diver tow kicked my ass. As the paddle leaves the surface of the water going to air the water does not depart the fin as fast as it does the split fins. In other words, it feel like you are doing leg lifts with every kick. Well I got the SP black split fins. Loved them! Easy on the surface, not more cramps last forever etc. So then why the switch? Two reasons filming and caves. I found that while shooting pictures or video sculling (not using your hands but being vertical and trying to hold a steady position by moving you fins) the splits just felt like mush and I found it very hard to hold a position. I had no problem with them silting but they hate them in the caves. I truly feel that once you get going then the fins are about the same in calm water but with current you really need the direct thrust to kick ratio. Lastly, there was just no way I could perform backing up with the splits.

 

[windapp]

Quick engineering point. Ft-lbs is a unit of torque, moment, or energy. It is not a unit of thrust.

 

[elmer fudd]

Quick engineering point. Ft-lbs is a unit of torque, moment, or energy. It is not a unit of thrust.

My bad! The sites I was looking at referenced it in ft lbs and I repeated their mistake. I've just spent the last 10 minutes reading up on lbs and Newtons and promise not to repeat my mistake.

 

[Griffo]

Pretty cool video! Wish I could have been there, might have been fun.

Can someone explain why he had his massive knife in his hand? That might explain why the others remained some distance away...

 

[Wingy]

I wondered that too Griffo....I also wonder why this has turned into a split fin v any other fin type argument - if anyone has been in that exact situation would like to comment on how their fins made a difference Id be interested to hear. Pretty easy to do that dive via keyboard.

 

[danvolker]

I wondered that too Griffo....I also wonder why this has turned into a split fin v any other fin type argument - if anyone has been in that exact situation would like to comment on how their fins made a difference Id be interested to hear. Pretty easy to do that dive via keyboard.

Many of us have had sudden currents we needed to push out of....this became a Fin issue AND a "lack of Skill" issue, because of the inabiliy of the divers in the video to provide any useful propulsion ( mostly skill) and because anyone that has used splits knows that you can't get one big PUSH out of them in an emergency thrust...like you can with many other fins.


The biggest issue on picking on Splits, is that SO MANY Split fin users have never learned the correct fin shape or stroke, and the splits let them get away with this 99% of the time. Divers with Jet Fins or Cressi Master Frogs, or FReedive fins, would have to know how to kick properly, and a sudden thrust, done properly, should have begun moving them out of the vortex....they guys in the video could never get started--their profound lack of propulsive skills is really what this video is about.

 

[shoredivr]

It's also about big knives.

 

[kaerius]

Never seen that before, closest I've experienced was in the maldives where a couple of sites had "washing machine current" which also spins, but on a larger scale and is more likely to just pull you deeper(the large vortex will create powerful downcurrent), never saw the center of it so it's possible there would have been something like this in there. Mind you if I'd been in the center of that, it would've been strong enough to pull me to the bottom with my BCD fully inflated.

Stuff like this can be downright dangerous, be wary of it.