Talk:Aquatic locomotion

Froude number and Froude efficiency

The Froude number and Froude efficiency are two different measures and should not be confused here. The Froude number has to do with surface waves resisting against a moving hull, whereas Froude efficiency is a ratio of power output to power input. This can be measured in a number of ways, but a common way is $\eta =$$C_{t}$ / $C_{p}$ .

Where $C_{t}$ is the non-dimensional coefficient of thrust and $C_{p}$ is the non-dimensional coefficient of power.

It doesn't really make sense to link to the wiki page for Froude number here, because that number is not about efficiency. Froude efficiency could possibly even get its own page (since it doesn't have one now). Tkemp (talk) 19:12, 22 January 2013 (UTC)

The blanket claim that animal jet propulsion is inefficient is inaccurate

Some of the fundamental claims of the jet propulsion section (e.g. "…jet-propulsion is a relatively inefficient method of aquatic locomotion" […] "The metabolic cost of transport for jellyfish is high when compared to a fish of equal mass.") appear to be based on an understanding of comparative aquatic locomotion that is not up to date. Excerpt from a recent study:

"By accounting for large interspecific differences in net metabolic rates, we demonstrate, contrary to prevailing views, that the jellyfish (Aurelia aurita) is one of the most energetically efficient propulsors on the planet, exhibiting a cost of transport (joules per kilogram per meter) lower than other metazoans.[…]

Potential advantages in swimming efficiency of gelatinous zooplankton locomotion have been previously overlooked because efficiency of swimming is commonly estimated using the Froude number, a metric originally designed to quantify the propulsive performance of ships.

A more comprehensive and ecologically relevant method of estimating energetic costs of locomotion is the net cost of transport (COT) […] a suitable metric for interspecific comparisons of swimming efficiency because the energetic expenditures for generating kinematic and fluid motion are not constant among species. By this measure, the moon jellyfish, Aurelia aurita, expends significantly less energy per unit of wet mass per unit distance traveled than other animals." — Preceding unsigned comment added by Kjellmikal (talk • contribs) 19:06, 29 July 2018 (UTC)

References

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Aquatic locomotion. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20121018072140/http://programs.northlandcollege.edu/biology/Biology1111/animations/flagellum.html to http://programs.northlandcollege.edu/biology/biology1111/animations/flagellum.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 06:42, 8 July 2017 (UTC)

Proposed merge

Moved to Talk:Human swimming § Proposed merge