#hydrodynamics | Explore Tumblr Posts and Blogs

revlischarm · 9 months

Text

Hydrodynamic AU

uhhh hi so. This has been cooking in my brain for a few months now (6???) and basically it’s a ROTTMNT Separated AU with Donnie as the focus but like, y’know. It’s all of them. I call it Hydrodynamic AU cause a lot of it comes from Donnie being more…water-based I suppose?? Either way. Yeah.

The story (if I ever find the willpower to draw it up) would revolve around Donnie going out and finding their siblings in the various locations; not to try and turn them towards the side of light or whatever. Donnie just wants to hang out. The universe has other plans, however.

More on each character under the cut!!! And lmk if any of you are interested in this!

Donatello Hamato

•Raised by Splinter

•They/them pronouns (Non-binary!!)

•Goes by the usual canon nicknames, but mainly uses “Dee”

•This Dee’s whole thing is being extremely water-based

•Donnie actually knows Repo Mantis before he got mutated! They started sneaking into his junkyard as a kid and got caught and they actually bonded

•When Don got older, they started helping Repo out with repossessing work; the two are even closer after Repo mutated!

•Don usually doesn’t wear their battleshell in this AU! It gets in the way of swimming stuff, so they prefer to be without it most of the time

•All of their stuff is painstakingly designed to the waterproof

•The whole lair has a ton of water slides in it, it’s super fun

•AUTISTIC!!!

•Don is extremely bad at socializing and doesn’t know how to mask (nor do they care for it). Can’t identify social cues well.

•Still friends with April; Don also hangs out with the Purple Dragons regularly (they give them ✨validation✨)

•Athletic only in how they’re an avid swimmer

•Really likes Lou Jitsu movies, and likes hearing their father talk about the films

•Splinter helps them train when they ask, thought Donnie also trains on their own with just. Copious amounts of research and looking up techniques

•Splinter is also extremely overprotective of D due to both their soft shell and the fact that he lost D’s siblings previously.

•More open to active destruction than canon Don?? At least in the way that’s like. More disregarding the well-being of others sometimes. Basically this Donnie doesn’t have their brothers to stop them from doing stuff. Violence and loose morals ensue.

•Builds Shelldon earlier on in life (was lonely and wanted company)

•Don has thoroughly explored the city’s sewers and set up tons of markers so they wouldn’t get lost; they’ve practically memorized the layout underground by now. Don has also installed a filtration system in the sewers to help take care of pollution because they don’t like how icky the waters can get

•Uses more turtle noises than actual words at times

•Fights with tech bō staff, but also knows the basics of other weapons; has the second most proficiency in daggers/knives.

•Doesn’t know anything about mysticism until meeting Mars and Draxum

•Technically, Donnie meets Mars first, then Leo, then Rento. However, we later find out that Don has met one of their siblings beforehand and knew of their existence. But that’s for later.

Marciano Draxum

•Raised by Draxum

•He/they pronouns

•Goes by Mars most commonly, but other nicknames include Marc, Marcie, Mar-Mar, Marky, Marce, and Marcus

•Draxum is actually a good parent okay

•Instead of Doctor Feelings and Doctor Delicate Touch, we get Sir Feelings and Sir Delicate Touch (they’re used as ranks, it’s some class thing idk. It’s ranked below Baron is all I know)

•Feral

•At a certain age Draxum started letting them out more (with supervision) and Mars got super friendly with all the yōkai he came across!! Due to this, Draxum has a much stronger active relationship with the Hidden City yōkai community.

•Mars uses their free time to create art around the Hidden City

•Has never seen the surface; wonders what the sky looks like

•Extremely strong mystic powers that were discovered early on

•Mars knows like, everyone in the city, and by the time they’re older are allowed to go about it from the lab as he pleases.

•Has a secret fascination with humans and their stuff that he keeps from his dad

•Draxum mellows out a tad raising Mars, being fatherly and all that. Still wants to take down humanity, he just wouldn’t do it if it meant endangering his child.

•Mars is an extremely adept fighter, having trained with Draxum since they were able to.

•Secret love for Lou Jitsu movies that he found one day in the yōkai markets

•He and Leo have met before and they have a very intense rivalry. Those two. Do not like one another.

•The reason behind the name “Marciano” is that I doubted Draxum would name his kid after some human artist. “Marciano” has French, Italian, and Latin origins, though I was mainly going for Latin when I chose it. It means little warrior! The name also has a lot of relation to the Roman god of war, Mars, which also happens to be the main nickname I picked! So it fits.

•Doesn’t like to kill; would rather thoroughly incapacitate a person through extreme measures instead.

•Terrible swimmer

•Draxum’s whole place is a lot more…nice looking? It’s got more style and creativity to it. Mars helped decorate.

•Fights with kusari-fundo and hand-to-hand mostly. Also knows the basics of fighting with other weapons.

Leonardo

•Raised by Big Mama

•He/him pronouns

•Trans man

•Goes by Leo most commonly; the other in-canon nicknames still apply too

•Both outfits are colored after Leo’s pride flags

•The paint designs vary a lot, Leo likes to show variety

•After meeting Donnie, he actually starts to incorporate more purple into his color scheme!

•Gay gay gay gay gay gay GAY.

•Fights in the Battle Nexus for fun; really loves the thrill of it.

•Spoiled

•Manipulative as fuck, picked it up from his mother. EXTREMELY good at lying

•Gets bored easily and will act out to negate this feeling

•Talks a whole lot while fighting; always making jokes, trying to throw his opponents off their game. (Think Spider-Man or Deadpool)

•Leo can actually get really violent at times

•Backstory behind Leo’s name is that they had an old name when they were younger and hadn’t come out yet, but upon realizing they were trans, wanted to pick out a new name. Big Mama gave him a ton of resources and books and stuff to help with that process, but it was actually in an old book of Lou’s that had been left behind that Leo found the name “Leonardo” and went with that. It’s a really stupid coincidence, but it is what it is.

•The fact that Leo chose that name from one of Lou’s books is bittersweet for Big Mama. And kinda funny lol

•Mars and Leo have a rivalry that formed because of BM and Draxum.

•Super fond of Lou Jitsu movies, but can only ever watch them in secret

•Leo will sneak out to Hueso’s whenever he can because he feels like it’s the one place where he can relax and not have to hold up appearances

•Leo still knows Spanish in this au

•He’s still a very cocky showboat in this, just dial that up to 11.

•Mainly uses ōdachi or katanas to fight, however, Leo tends to just use whatever’s on hand in matches. Knows how to fight with a wide variety of weapons semi-professionally (and I say that loosely, Leo mostly just wings it)

•Able to use mystic powers and uses them well, but prefers not to when fighting.

•LOVES stage magic with a passion, and actually practices it in his spare time.

Rento Jones

•Raised by the Foot

•She/he pronouns

•Goes by Ren for short

•Backstory for Rento is that little Cassandra was lonely and didn’t have anyone her age in the clan, and the Foot Lieutenant & Brute ended up finding this baby snapping turtle on a whim and gave him to her as a pet. Little did they know Cass just gained a new sister instead of a pet.

•Much more prone to violence than in canon (or at least to anger)

•The name Rento has a few meanings to it, but I mainly chose it because it started with an R and it fit. And was of Japanese origin.

•Cassandra is adamant about the two of them being siblings, and since Ren didn’t have a last name of her own, Cass shared hers

•Rento is still extremely soft on the inside, but is very afraid to show that side to people he doesn’t know.

•The entire Foot Clan will annihilate you if you hurt Rento in any way

•The clan is super fond of its spiky murder reptile!

•Ren doesn’t realize what she’s doing might be seen as “wrong”, he’s just focused on helping the Foot and being proud of that. Only ever hesitates when directly hurting innocent people or animals comes into the picture.

•Rento’s only issue is with hurting innocent people or creatures; she won’t hold back if something gets in his way.

•Cass and Ren have a habit of hyping each other up

•Rento is super proud of looking big and scary cause it means she can better protect the people she cares about!

•Cass and Ren can both speak Japanese to a degree

•She has a huge collection of plushies that have either been gifts to him or were stolen from large businesses; can’t sleep without at least a few plushies around.

•Only turtle of the four who doesn’t know anything about their backstory or having siblings

•Switches between sai and tonfa to fight, but mainly sticks with the sais.

•Second-best fighter of the turtles; also knows how to fight with other weapons in basics. Mainly relies on hand-to-hand combat.

•Doesn’t know anything about mysticism

•Not very good at origami

•Loves watching Lou Jitsu movies, though Cassandra doesn’t share the enthusiasm.

#ROTTMNT #ROTTMNT au #rottmnt separated au #rise of the tmnt #my art #art #Donnie #Leo #rottmnt raph #rottmnt Donnie #ROTTMNT Mikey #rottmnt Leo #rottmnt marciano #rottmnt rento #hd au #hydrodynamic au #rise

129 notes · View notes

vermillioncrown · 1 year

Note

how do you think flying on a sword compairs to skateboarding/snowboarding? if an expert snowboarder ended up reincarnated do you think they could be a flying prodigy?

oh my god this ask has me doing the equivalent of that stick figure biting into a thing and tearing it apart (in a good way)

yes and no. i think they'd have a leg up and have a higher chance at being a flying prodigy if and only if qi powered flight has aerodynamics involved, and isn't just the equivalent of using your mind to hover through the air.

think of a paper airplane. you can 1) throw the plane and have it glide, or 2) personally hold the plane and move it through the air. both have the paper plane 'moved' but the forces and energy involved are very different.

(1 is more energy-efficient btw, and energy in the physics sense of work)

so let's say 1) is how sword flight works. okay, let's compare it to riding a skateboard or snowboard.

the key difference is that you don't have the ground. that sounds stupid but it matters.

before sword flight, let's think of an aircraft. and before motion, let's think of being still.

without doing work, you can stay in place with a skateboard. why? because you have the ground. the balance of forces is stable without motion. you weight a certain amount and press on the ground, and the ground can push back through the wheels. it's called normal force and we don't have time to go through intro to hs physics. it's why you don't fall through the ground.

snow is a bit different but it still works out. ground is dense enough that you don't compress it like snow, it's solid. snow isn't... purely solid--the individual snow flakes are solid crystalline structures, but it's a collection of these tiny little solids that can move if you press them together. we can call the collection of snow, not an individual snow unit, a fluid rather than a solid. fluids do not hold their shape if you use an outside force on them. from basic chem, we have gas, liquid, solid states, so fluids encompass gas and liquids (with so many caveats but again y'all aren't signing up for intro to viscous fluids)

but let's treat snow like a very dense fluid. the entire snowboard is distributed over the snow rather than the tiny wheels of a skateboard. you can already intuitively imagine that if you put a skateboard on snow, it'd sink until the flat part. the density of matter is what affects how it can 'push back' at things. ground is super dense compared to snow, so little wheels can stand on it vs snow needing a huge distribution to push back the same weight (snow shoes).

air is much less dense than snow. with a density of 1.225 kg/m^3, let's say you weigh 50 kg (~110 freedom units). using basic ass Pressure_liquid=density*acceleration_gravity*height and Pressure_you=mass*acceleration_gravity/Area -> we want P_liquid = P_you -> solve for Area... to stay still at a height of 10 meters, you'd need a 'board' of 4.082 m^2. or about 44 sq ft. but! that board will also have a weight, so you need something bigger, and bigger,

there's nothing out there that can support you, and be lightweight enough to not outpace the pressure that air can exert back to keep you in place. so how do you stay in the air?

two ways. either hover like a helicopter, continuously moving upwards to counteract gravity... or you continuously move forward like an airplane.

motion time! probably heard of lift force? what you're doing is, as you move through the air, you're displacing the air molecules. think of how it feels to wade through water. the faster you go, the more water pushes back.

now up the magnitude for air since it's less dense. you need to move very fast to displace enough air such that the amount of air pushing back can actually keep you up. but! you also need to deal with that resistance against your motion, too, aka drag.

but in this case, to even keep in constant motion or zero motion, work must be expended to push you up or keep you moving forward, or you eventually slow down and fall like a paper plane

skateboard relies on normal force and friction for its movement. i count staying still as movement, too; it's just movement = 0. you push on the ground with your feet, the ground resists your sideways push, and the wheels can turn, so you move forward.

snowboard relies on something like buoyancy and gravity for its movement. the pressure of the snowboard on an area of snow keeps you up, and you slide downwards because gravity pulls you. friction is still at play but not like skateboarding; the snow is 'slippery' compared to the ground, so you can glide forward

aircraft rely on external forces for any constant motion, even motion = 0. air isn't dense enough to support things in the same way as the ground or snow.

let's get to why it matters for sword flight.

for changing directions horizontally, all three would be similar. you lean (banking) towards the direction you want to turn, relying on the force keeping you level to push you towards the turn.

for climbing or rolling up, similar--you need to push the ground, expend effort to go up a hill on snow, or provide more thrust to exceed gravity's pull to climb in altitude.

diving, rolling downhill are similar. gravity does the work.

the mechanism for slowing down or staying still, however, very different. for sword flight, it's not that you can't; it's that you cannot rely on the same intuition as for terrestrial boarding. you probably need to consciously trade between the qi-pushing you forward to needing to push you upwards, and it's always a balance. you basically need to treat your qi like a reaction control system for spacecraft, which gets into optimal control theory and of course it's not that the human can't intuitively do it. but it is DIFFERENT than skateboarding or snowboarding. you're not moving your weight around to change motion; there's this nebulous qi thing that needs to be controlled alongside the positioning of your weight to do what you want it to do.

so i think the pro-skater (pro-boarder) will have an advantage, but it's not directly equivalent.

now, if qi-powered flight was the equivalent of holding a toy plane making airplane noises to move the thing through the air, moot point. entirely not the same thing at all, they don't have an advantage in qi control. but they do have the advantage of balancing on a thing in motion.

happy winter holidays, sorry not sorry to ambush y'all with physics

#inquiry #Anonymous #on dbd #science shit #look i almost drew diagrams but like i have shit to do #there are a lot of caveats to what i said too but we're going through so much #kinematics+friction+work-energy+pressure+hydrodynamics+fluid mechanics+aerodynamics+control theory #never mind i didn't get into aerothermodynamics for the temperature/density/pressure fluctuations #never mind viscous theory + more complex drag forces #and if they manage to go supersonic that's a WHOLE new can of worms #we don't even know if qi is a field #back to sewing #french seams are a special kind of hell when you need to tailor #and i'm adding gussets so extra extra hellish

33 notes · View notes