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I've been thinking about making a species that uses wheels for locomotion. However, instead of using muscle tissue to spin them (as that would cause damage to said tissue), they would use electricity to produce kinetic energy to spin them.

This would work via the use of two protrusions at the end of the legs and would have two points made of conductive materials pointing inwards from the sides of the protrusions. These points will be connected/hold in place the wheels, which will either have a ball-like shape or a standard wheel-like shape made of a spongy rubber-like biological material that acts as a "tire." The two-points would then emit electricity into the wheel to produce kinetic energy/spin, resulting in movement with these wheels.

However, I'm not certain what problems would arise from a species that uses this method, leading me to ask. What problems would arise if a species that uses wheels via electricity/conductivity instead of muscle tissue too move?

EDIT 9/30/19: It's clear to me now that my idea/concept has some glaring problems with it, and I haven't thought as well about it as I thought, and that it needs some serious reworking or needs to be scrapped. Therefore, I will mark this post as answered and/or delete it (whichever the viewers of this post thinks is best). Sorry for any issues or problems I might've caused with this post.

Gryphon
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Caveknight32
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    Apartments with only stairs would be MUCH cheaper. And, being electric, folks couldn't easily use compasses to navigate. – user535733 Sep 30 '19 at 17:27
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    How are the ball bearings created/repaired/replaced over the lifespan of the creature? – Cadence Sep 30 '19 at 17:33
  • Also: https://worldbuilding.stackexchange.com/questions/20664/naturally-occurring-wheels-do-the-mech-vs-tank-comparison-apply-to-organi – Morris The Cat Sep 30 '19 at 17:35
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    How do you propose that electricity produces motion? It'snot clear. Is there an electric motor in there somehow? Coils of wire? Does it eat lodestone to build up magnets? – puppetsock Sep 30 '19 at 17:38
  • @MorrisTheCat Well, the post is somewhat about wheels and how they would work. However, the post's about the problems that would occur from a specific way of how wheels would work. – Caveknight32 Sep 30 '19 at 17:40
  • @puppetsock I was thinking of having it work similarly to the Lorentz force. – Caveknight32 Sep 30 '19 at 17:44
  • @user535733 What the heck are you babbling about? Could you be more specific about what you mean? – Caveknight32 Sep 30 '19 at 17:45
  • @Caveknight32 Most of the problems called out in the responses to those two posts would apply to your proposal too. Most critically, there isn't any viable evolutionary path that leads to that end-state that I can see. Unless these are supposed to be engineered artificial life forms, the mechanism of locomotion only works if you can actually evolve to it, and if a newborn of that species can grow with it. I don't see how either of those is possible with this. – Morris The Cat Sep 30 '19 at 17:47
  • Um... Yes, Lorentz force is what causes electric charges to move. Such as how they move in batteries or electric wires. Now, how do you propose that turns into a means of moving an organism? – puppetsock Sep 30 '19 at 17:48
  • I don't see why you need electric propulsion for a wheeled creature.The wheels don't have to generate propulsion, they just need to roll. The creature could have wheels and kick at the ground, coasting like a skateboard, or they could have some appendage that kicks at the wheel itself to generate movement, like a bicycle without a chain. Evolving wheels is already tough, evolving an electromagnetic motor along with it will be enough tougher. A muscle-powered wheel will be far simpler. – Nuclear Hoagie Sep 30 '19 at 18:05
  • @NuclearWang The electricity and conductive materials would produce an electromagnetic field, which would make the wheels roll. This was mostly an idea to avoid the issues of tissue damage and repair, and the nightmare of understanding the mechanics of a muscle-powered system. – Caveknight32 Sep 30 '19 at 18:19
  • @Caveknight32 You've really just replaced one nightmare of understanding with a different one. – Morris The Cat Sep 30 '19 at 18:21
  • Have you ever tried pushing a cartwheel over uneven terrain? Hint: outside cities there is a lot of uneven terrain... – SJuan76 Sep 30 '19 at 18:28
  • There are spiral-tailed microbes which drive their "propellors" without a connected muscle. – Carl Witthoft Sep 30 '19 at 19:05
  • @CarlWitthoft - But a) they don't do so consciously, and b) they do so via a sodium/calcium ion gradient. Doesn't work so well when scaled up to megafauna. – jdunlop Sep 30 '19 at 20:08
  • Brightness Reef and The Amber Spyglass include wheeled races. One is biologically wheeled, the other adds a mechanical wheel. Both a light on details, but give a reasonable gloss over the idea. – Jontia Oct 01 '19 at 08:33

2 Answers2

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The primary problem would be "how would this work in the first place"?

Electricity alone does not make a wheel spin; electric motors require electromagnets to function, which do not occur in nature. So even assuming biological electricity generation (totally reasonable), the electricity wouldn't be any good for propulsion.

Secondary (and mentioned in the comments) would be the attachment point. At some point, the wheels would presumably be a contiguous part of the organism, leaving them immobile until the wheels are "fully grown", because the wheels would be unable to rotate without twisting and tearing the connective tissue. So after a long period of immobility, the velvet for the wheels sloughs away, leaving.. what? An exposed ball-and-socket joint? How is damage to the joint dealt with? Is there an axle, or do the wheels rotate independently?

So my answer to "what problems would arise": existential ones, and, even assuming those can be overcome, the issue of tremendous infant vulnerability while waiting for their wheels to grow/ripen.

jdunlop
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    I mean, I think it would be easier to just depend on other organisms in a symbiotic process, and have the species we're designing roll around on organisms of another species. – Cloudy7 Sep 30 '19 at 17:53
  • @Cloudy7 - Probably, but you still have the problem of waiting for the wheel to mature/ripen before it could be used, and the connection point is still an issue. – jdunlop Sep 30 '19 at 18:05
  • An electromagnetic field is produced by charged objects/electric charge moving through these objects. So any object can have an electromagnetic field/properties as long as electricity can move through an object with a degree of conductivity. Which is how this system would work by having the charges move through these conductive materials to produce an electromagnetic field to spin/move the wheels. Though, I'll admit that I should have mentioned/said that in my post at first. – Caveknight32 Sep 30 '19 at 18:12
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    @Caveknight32 Induced electromagnetism travelling through uncoiled conductive materials is tremendously weak unless the energy is extremely high-voltage. So now your postulated organism generates a high-voltage electric current, which they have to invert with suitable timing to actually spin the wheels, which somehow doesn't kill/fry whatever allows them to grow the wheels in the first place? The existential questions keep piling up here. – jdunlop Sep 30 '19 at 18:27
  • Think shark teeth. – Spencer Sep 30 '19 at 18:36
  • I always imagined wheels would need to be some sort of symbiotic organisms that would be fed with 2 connecting tubes when the main organism is at rest. – Andrey Sep 30 '19 at 21:58
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Regardless of how you get the wheels to work. The biggest issue is that natural terrain is not flat and smooth. If you have ever seen a video of a robot walking or a car driving, you notice that more often than not, they are doing it on a street, or in a house. Somewhere with a smooth floor that's relatively flat.

Natural terrain will tear apart anything with wheels. Your talking about pebbles and stones that shift underfoot. Twigs, sticks, logs and fallen trunks that will block your path. Ditches, gaps, hidden terrain which will leave you stuck and unable to move. You also get Uneven terrain, maybe even vertical or upside down (depending on the animal scale).

Basically, wheels only work on smooth and flat terrain. Throwing anything additional into this will require extra muscle groups to help act as suspension and to lift the wheel over obstructions. Muscles which would be more efficient, lifting and moving legs than spinning wheels.

Shadowzee
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