Split fins?

[scjoe]

This topic has proceeded as it always does. If the OP is still following the thread, he might want to Google Dave Pendergast. He did two different studies on fins that are worth reading and understanding.

 

[Scott L]

Since that split fins; specifically Atomic Aquatics split fins, have been tested by ScubaLab to show that they have pretty much the same thrust and speed as a very good solid fins, so yeah, I think that my fins will do just fine with doubles and drysuit.

I am quite sure the Scubalab test was conducted utilizing a single tank configuration...

 

[Pullmyfinger]

If you made a couple more cuts (probably not as deep), you'd have a "spork". Some (campers?) find them quite useful.

If you CAN'T see any advantages to using a split fin design, maybe this image of a dolphin's tail could help:

BTW, I don't think their "split-fins" have any more trouble with current than mine do.

Please not that there ARE some split-fins that don't do well in current. I returned a pair of split-fins that I found inadequate/too flimsy for even single-tank recreational diving. As I mentioned in an earlier post to this thread, not all (split)fins are created equal.

I'm also generally not trying to move a truck-load of gear through the water when I go diving.

Just my opinion.

Cheers.

If I mad more cuts in that spoon, I'd have an an increasingly less effective spoon. I have seen a spork before, they don't make a very good spoon. You can't use them as a fork at all.
I cut a slot in that spoon awhile ago as a joke, and to illustrate the pointlessness of having a slot (in the spoon).

Canoe and kayak paddles don't have slots cut in them either, for obvious reasons.

There is no doubt that a slot will make the effort easier. I will never argue that point.

Split fins HAVE to be easier to use for the person wearing them.

The split spoon in my picture will also make it easier to lift soup from the bowl as well......it would probably force you to adopt a faster cadence if you wanted to move the same volume of soup to your mouth in the same amount of time as us solid spoon users.

All you modern forward thinkers out there can keep using your new and improved split spoons.....I'll stay in the 14 century with my old solid spoon. Thank you.

Split fins seem like one of those midnight infomercial offerings. The Sham Wow guy could probably lift his sales pitch directly from Scubaboard. He could use a Vulcan/Spock hand gesture to illustrate.

Live long and prosper.

Mitch

 

[iztok]

Pullmyfinger, your comparison is utter nonsense. Spoon is designed to hold liquid. Fins are designed to move liquid. You don't push fin perpendicular to where you go but at certain angle. Fins should be pushing water in certain direction based on their design.

Airplane wing is not split and provides decent lift. However if you observe an eagle wing you will see certain small splits at the end of weathers. How much you want to bet that eagle wing is more efficient in providing lift than airplane wing? If we had better way of imitating eagle wing on an airplane I am sure we could improve the efficiency and design.

 

[Scuba.com]

We vote for the Split fin design.
Scuba.com Video: TUSA X-Pert Zoom Adjustable Strap Fins Video Review - Fins

 

[Roko]

These are the fins I use, I find that I can get 15 PSI to the furlong improvement with these fins over any other fin out there. They have the awesomeness of paddles, with multiple splits to be even MORE efficient than a lowly single split.

One of these days I hope to stop worrying about fins and just enjoy diving.

 

[iztok]

These are the fins I use, I find that I can get 15 PSI to the furlong improvement with these fins over any other fin out there. They have the awesomeness of paddles, with multiple splits to be even MORE efficient than a lowly single split.

Ignorance is curable, willful ignorance is not.

 

[fnfalman]

I am quite sure the Scubalab test was conducted utilizing a single tank configuration...

Measured thrust is is measured thrust. If split fins were to generate less thrust than solid fins then it would have shown regardless of what tank configuration or exposure suit configuration.

 

[fnfalman]

Pullmyfinger, your comparison is utter nonsense. Spoon is designed to hold liquid. Fins are designed to move liquid. You don't push fin perpendicular to where you go but at certain angle. Fins should be pushing water in certain direction based on their design.

Airplane wing is not split and provides decent lift. However if you observe an eagle wing you will see certain small splits at the end of weathers. How much you want to bet that eagle wing is more efficient in providing lift than airplane wing? If we had better way of imitating eagle wing on an airplane I am sure we could improve the efficiency and design.

Eagle's wing design may generate a lot of lift but it doesn't generate a lot of speed. So what's your point about eagle wings and fin designs?

 

[fnfalman]

Okay, let's say that paddle fins are "superior", well then which paddle fin should I use?

Hollis F1? Dive Rite? OMS? Turtle fins? Mares Avanti Superchannel? Scubapro Supernova? Aqualung Slingshot?