/sci/ - Science & Math

No. Some technological stuff like wheels and what you mention cannot be encouraged by evolution because they are "all or nothing" mechanism. Meaning their advantage would only be worth it once it's completed but every step of the way would be a disadvantage.

Yes, by burning methane. It was in a tv documentary that I saw when I was a kid and it's etched into my memory.

>>11949855
I imagine if the atmosphere is dense enough, similar to Venus, and with low gravity, you could have entire ecosystems of airborne species inhabiting different layers.

Something like packs of algae floating in the air through helium sacs, and jet-propelled floating animals feeding on them and each other.

>>11949926
https://speculativeevolution.fandom.com/wiki/Skewer

>>11949924
If the squid's food source moved to shallow waters where it could not dive to escape avian predators, could this "all or nothing" mechanism not work for it to escape birds of prey? But even if no, just assume that there is an evolutionary pressure for it to develope for the sake of investigating if something like this could even be possible.
I know that shafts cannot develop in nature, and those turbine compressors are therefore out of the question, but surely there are other ways to compress air?

>>11950027
There's no evolutionary pressure to develop a. Complex mechanism. Evolutionary pressure only works for simple stuff. Our body is complex because it's a combination of simple stuff that each serve a different purpose

A jet engine isn't that ,it's a combination of pieces that are utterly useless by themselves

>>11949855
Google about rods insects

>>11950445
do you understand the difference between jet propulsion and a fucking jet engine

>>11949924
It wouldn't need to be all or nothing, even a quick puff could give it a bit of extra distance to avoid a predator.

>>11949924
You could bootstrap this off the mechanism of the bombardier beetle.

>>11949924
cephalopods already have jet propulsion you fucking mong
jet propulsion =/= jet engine

>>11951077
>cephalopods already have jet propulsion
So how to you turn that into airborne propulsion?

>>11952370
I don't think air is dense enough for it to work

>>11952370
make it extremely light
like a plastic bag

>>11952370
have less gravity or thicker air or less ground

>>11949855
only electrolysis propulsion with optical navigation is possible

>>11949950
So not that different to the oceans huh?

>>11952370
A balloon filled with air can already propel itself, so at the least, a squid could fill its mantle with air and blow it out like it does with water. But, to get continous jet propulsion, it'd need a way to maintain the pressure inside its mantle, by sucking air in. Humans use rotating parts to do this in our jets, but i'm sure biologic life can mimic an impellor without the spinning parts, that way continually filling its mantle with air or water at high pressure, and shooting it out its anterior by a jet orifice

>>11953709
Here's my idea:
A row of muscle rings are joined together by the mantle. These muscle rings can deform into ovals, and by contracting different regions of the muscle rings, they can change the rotation of their oval forms. As the muscle rings change the rotation of their oval forms jointly, they create a rotating double-helix vortex-shaped cavity within the mantle. This rotating shape causes pressure to drop inside the mantle, and draw air from the posterior air intake. Air, which is now in motion, continues to gain pressure and velocity as it travels along the rotating cavity inside the mantle, until it is expelled out at high speed and pressure at the anterior by a jet orifice, which propels the squid forwards.