Advantages: Very little effort required underwater, flexible Disadvantages: Not cheap, not the best for long surface swims
...My MaresVolo Power fins are among the favourite items of my dive kit. While pricey, they do a very good job, and make finning underwater incredibly easy. One of the few drawbacks is I find they're not as good for surface swims, particularly against current. They are longer than many standard fins, which takes some getting used to, and it's something to be aware of when you're near fragile coral reef. However, they're also ultra-flexible, and I usually find I can get back into the boat while still wearing them.
Initially I found the quick-release catch at the side to be rather cumbersome - the lock-unlock mechanism isn't very easy with gloves on. To be honest, I've now taken to closing and not locking them, and they've never opened up while I'm in the water.
When these fins first appeared on the market they were pretty expensive...
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Advantages: comfortable to wear Disadvantages: not as much propulsion as other types
...These fins i found after several uses i had fewer leg cramps when using these than i do my other fins and i found as a result my air consumpption was less.
But these dives were mainly conducted in calm conditions with little or no current running, such as while training in Capernwray.
In a current i found that i was less comfortable and was not making progress as i would have liked, when i used the fins diving the thistlegorm i found i caused less of a silt up although i didnt do as much of a prenetration as would have been usual for my familiarity on the wreck. This was due to a slight current i encountered outside the wreck which caused a necessary shortening of the dive, because i was breathing harder due to the having to fin harder to keep with my buddy.
Over all the fins i would recomend in the likes of a quarry or lake...
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...INTRODUCTION
I used to have some Mares Plana Avanti Quattros (yes, that is what they're marketed as) which were very impressive but flawed in the comfort department. They gave me terrible calf cramp. After asking around and settling on a Jetfin design, I tried on some of these grey fins in a very eminent technical dive shop near Egham, Surrey. The salesman, whom I trust, said that the fins were among the best he'd tried and urged me to have a go with them. They have a design that mimics a whale's fin, he said. It's all about looking how nature's biomechanics work and passing this onto a diver. I must admit I was a bit sceptical.
TRY-OUT
I was impressed after a pool session and more or less convinced of their ability to propel the diver efficiently and without undue effort. The vents at the base of the twin blades allow water...
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