Mermaid fin vs. conventional flipper

  • Thread starter Andrew Buren
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In summary, the question being discussed is whether a scuba flipper with a single up and down stroke would be more efficient than the traditional scissor kick. Some advantages of the single stroke design include less fatigue and decreased drag through the water. However, it may also cause stress to lower back muscles. The dolphin-kick, which uses a similar single stroke motion, has been found to be more efficient than the scissors-kick, with a reported 80% efficiency compared to 15%. This has been demonstrated through the development of a device called Powerswim by DARPA, which has doubled the sustainable speed of SEALS underwater. The design team behind Powerswim also invented the SequeTM valve.
  • #1
Andrew Buren
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This is just something I was thinking about...
would it be better to design a scuba flipper that has only one up and one down stoke for every cycle instead of the scissor kick? If so (or not) what would be the advantages and disadvantages?
 
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  • #2
If you've ever scuba-dived and tried "mermaid kicking" with both fins together, you quickly realize it is a less efficient use of your gloriously separate legs. You will get tired more quickly and your drag through the water is somewhat increased because your whole body has to get into the act.
 
  • #3
Yes I do dive. However, could it be posible that you think it less efficient because we are used to the conventional way?
 
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  • #4
I can't swim any more, and only used fins for snorkeling anyhow, but my impression is that a 'mermaid' kick would soon cause painful stress to your lower back muscles.
 
  • #5
Actually, with the right bit of kit, the dolphin-kick can be much more efficient than the scissors-kick. DARPA has developed http://www.popularmechanics.com/technology/military_law/4223354.html" for exactly that reason. They claim that while swim fins are about 15% efficient and turning muscle power into propulsion, this device approaches 80%. In trials, it has doubled the sustainable speed at which SEALS can travel underwater without a vehicle.

http://gizmodo.com/gadgets/military/darpas-powerswim-brings-out-the-aquaman-in-you-318195.php" that has a video of the device in action. I see that the guys who actually came up with the winning design are the same folks who invented the SequeTM
 
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1. What is the difference between a mermaid fin and a conventional flipper?

A mermaid fin is typically a single, oversized fin that is designed to mimic the movement of a mermaid's tail. It is usually made of a flexible material such as silicone or rubber. On the other hand, a conventional flipper is a pair of smaller, more rigid fins that are worn on both feet for swimming. They are typically made of plastic or rubber.

2. Which one is more efficient for swimming?

It depends on the individual and their swimming style. Some people may find the mermaid fin to be more efficient as it allows for a larger surface area to propel through the water. However, others may find the conventional flipper to be more efficient as it provides more control and precision with each kick.

3. Can a mermaid fin be used for scuba diving?

No, a mermaid fin is not recommended for scuba diving as it is not designed for the same type of movement and could cause discomfort or injury. Conventional flippers, on the other hand, are specifically designed for scuba diving and are the preferred choice for underwater activities.

4. Are there any drawbacks to using a mermaid fin?

One potential drawback of using a mermaid fin is that it may not provide enough propulsion for longer distances or faster speeds. This could be a disadvantage for serious swimmers or athletes. Additionally, it may not be as durable or versatile as conventional flippers.

5. Can children use mermaid fins?

Yes, there are mermaid fins specifically designed for children that are safe and easy to use. However, it is important for children to be supervised while using them and to follow proper safety precautions. It is also recommended to start with shorter swimming distances and gradually increase as they become more comfortable and confident with the fin.

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