i tested that, we can. at 60 km/h, we just need to lean forward and try to put pressure at our feet. it'll stabelize us.

well, since i tried it on normal blade, there's no acceleration. just a deceleration. so we need to test it with the acceleration too.

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you actually did calculations? YOU ARE AWESOME.
post em please, i really need to know what i got wrong, cause i know that the numbers should be like yours but mine are a lot higher and i really don't get where i went wrong.

the torque wom't be so bad, cause leaning forward even by a small degree will make so that gravity wil almost counter it for all. you just have to be really careful to not accelerate too fast or to lean too forward.

60 km/h is roughly 40 mph? Maybe it's 'cause I calculated it at 60mph. I'm not sure what speeds you guys are trying to achieve.

Er @ dancwart:
is the equation for air resistance (at relatively low speeds).
density of air is about 1.293 kg/(m^3). (That's the p-looking variable)
v, velocity @ 60mph is about 27 m/s (you need to convert everything to meters, seconds, and kg)
A is the area. I assumed a surface area of 5.5 feet by 1.5 feet (I told you this is a really rough calculation @.@), which turns out to be about .766 m^2.
Cd is the drag coefficient (drag is another word for air resistance). According to wikipedia, Cd for an upright man is 1ish.
v(with the hat thing on top) is just a unit vector (which just basically means it tells you the direction (which means it can only be negative one or one, in which case it doesn't really affect the calculations)

Multiplying everything out gives you about 350 newtons, which is the force due to air resistance. (I did a bit of rounding). And if you divide that by 9.8 m/(s^2) (the acceleration of gravity (on heights relatively close to the earth)), that's about 36 kg which equals 80lbs, so 350 newtons is the force of gravity on 80 lbs.

I'm not sure how all this applies out in real life since I don't skateboard and I only snowboard, so the acceleration there is only a portion of gravity, so the effective F is pretty low and I don't really achieve speeds up to 60mph. (I'm on a slope, so only the force of gravity that is parallel to the mountain slope affects my acceleration along the mountain slope). But if you took your center of mass as the pivot point, all the torque from your neck to your ankles would cancel out because the air resistance is applied equally to all those regions. So the only torque that's not canceling out is the air resistance to your head and the force of the skates on your feet since those both point in the same (torque) direction.
Let's say that you you can get from 0 to 60 mph in 10 seconds. That gives you an acceleration of 2.7 m/(s^2). For a 130lb person, that's a force of 162 newtons applied at your feet in the direction of your movement. Then taking into account the 350 newtons applied to your head in the same direction (torque-wise). That's about 510 newtons of torque overall?
If you lean forward, you push your center of mass a little forward, but the same torque is still applied, I suppose it'd just take you a little more time to flip over. But the general equation for torque is Fr, r being the distance to the center of mass, so if you leaned low enough, you could reduce the torque by a significant amount.

lol k I spent a little too much time on that. I need to get back to studying for my math quiz haha.

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dude. you're good with physics. i wish i'm as smart as you. then i don't have to get "G" in physics all the time.

well, i can only understand part of what Lybi said. can somebody translate it to a more simpler way?

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Let's get Kickin' ...whatever that means

actually i tought that that formula is just for calculationg the force applied on you by air drag. what we really needed was the power necessary to overcome, that i took from this formula



but multyplying the F vor v again brings my total to around 11800N*m/s or 11800W so to say

i assumpted a surface of around 4 m^2 and a drag coefficient of 1 (halfway between plastic on concrete and rubber on asphalt) holding 70kg of weight (normal force 70N)

in the resto of the thing she says that basically your feet accelerate faster than your belly, so you tend to flip over, unless you lean forward, but to lean forward you need a lot of strenght.

even simpler : take things nice and slow, or kiss asphalt.

oh. coz the wind resistance will push you back, so it's gonna be hard to bend over. right? i knew i should study physics alot harder.

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Let's get Kickin' ...whatever that means

yup something like that

try to put a hand out of the car when is going and try to push against the "air wall" that should give you an idea.

in the end the wind road is all about reading air densities and finding the better way to move around

so, our only way to lower the wind resistance is to bend over. hmm....

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Let's get Kickin' ...whatever that means

lol yeah maybe I should've just said that to begin with. >.<
But you were right about the power thing. I was just calculating the force due to air resistance. And a surface of 4m^2 is a lot? especially if you weigh 70kg lol but details details~ We'll just wave them until they actually become important.

Oh. You could also overcome wind resistance by applying a force equal to the wind resistance to your center of mass (probably around your belly, I'm not quite sure and I really don't want to calculate something like that).

So basically that means, you'd need something propelling you from your back? I only just started my engineering classes (and I've only taken a class on basic newtonian mechanics) so I can't tell you what you can attach to your back, but you would need something equal to the force drag (wind resistance).

But that sounds like it hurts lol. I wonder how much force (even if they cancelled out) a human body can take before... Oh I just quickly googled it. It takes about 9-10 g's (this is like slowly accelerated (actually I suppose acceleration isn't the right word. "jerked"? I guess?) to that acceleration. If you experienced 10 g's at once... Er. Yeah.) before getting knocked out. So never mind about that. You don't have to worry about getting knocked out because too much force is getting exerted on your body lol..

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Whoa haven't been here for a long, working my art and practicing piano.
<----- thats a fanart I made

Daym, ikki and them got it easy, they live in an Anime World we live in Reality we have to worry about the Physics in Earth and Mechanics in EARTH. Anywho, does it matter how you are positioned in order your body to be affected by air resistance? can we not lean with our belly facing another direction so the belly will not face flat? if we can only crumble ourself like a ball then this might work out.

hehe

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a.Art is Music.
g.Art is Art.
p.Art is Me.

hi ya guys ^^
i see you have done some great work, but i think (not to discourage you guys or something ) that we should make a model first en form that point on add the engine an other extra stuff, like vince did on page 10, with the photoshop^^
we should make that real ,and if can make that real, we can make everything ellse real!! I am working on the model right know, i will upload some pics later on ^^

Faculty

thanks faculty.

@ahvat

it does matter. if you don't bend over, better take it slow or you'll flip backwards. when you bend over, you will add more pressure to you feet(or ......) and..... how do i say it.... man. i just did the test the other day and now i'm forgot already? let me check my notes.

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guess your right leaning in a different direction doesn't matter, we have to take it slow before we kick up the acceleration. I kinda get it its like a Nickel on a Paper while the Nickel is at rest, Pulling the paper off the Nickel, the Nickel remain at Rest.

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a.Art is Music.
g.Art is Art.
p.Art is Me.

you got it.

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Let's get Kickin' ...whatever that means

I was thinking just like cars have fenders would it be good if ATs had fenders? JUst thinking a way to cool off the engine.

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a.Art is Music.
g.Art is Art.
p.Art is Me.