overheating wheels?
hi to day i was riding a normal park skateboard around the hill near my house and i started carving down the hills and after a while the wheels got really hot and after a while the wheel would hardly even grip the road on tight turns the only thing i can put it down to is the heat in the wheels does anyone have any other ideas.
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Premium MemberPermalink Reply by The Dave on -
Ummmm.....try H = mcΔT bernie.....
Last I checked, skate wheels weren't going thermonuclear*.
I love how redundant this thread is. The only good place it could go is ludicrously off topic. I'm doing my bit....
* Though we got pretty close at the Hill From Hell at Gabe's slide jam I have to say...
bernie said:It has something to do with E=mc2....
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Permalink Reply by Alex Gillis on
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Heat capacity really doesn't come into it either. Unless you were comparing which wheel variety heated up more. I suppose denser (harder?) wheels would have a greater heat capacity. You could test that.
It has a lot more to do with the size of the wheel. A tiny park wheel will heat up a whole lot more than a Big Zig, which will heat up more than say, a rubber car tyre.The Dave said:
Ummmm.....try H = mcΔT bernie.....
Last I checked, skate wheels weren't going thermonuclear*.
I love how redundant this thread is. The only good place it could go is ludicrously off topic. I'm doing my bit....
* Though we got pretty close at the Hill From Hell at Gabe's slide jam I have to say...
bernie said:It has something to do with E=mc2....
On topic...heat's not going to do much to your wheels man, they're just synthetic rubber. Like Fitz said, check your bearings if you're concerned. I can't imagine heating your wheels up would make them grip less. Look at F1 drivers at the start of a circuit. Warmer wheels will conform more to the road, giving you more traction.
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Premium MemberPermalink Reply by m0juu on -
brao, park board wheels wont grip very much at all. end of story ask some more and get trolled harder.
the best part is you are getting trolled by highschool teachers; its the best!
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Premium MemberPermalink Reply by The Dave on -
Oh man it's so on!
By size, you wouldn't possibly be referring to increased wheel mass would you? That wouldn't have anything to do with the m in that equation would it?....
Of course not :P
Yes, I am procrastinating by arguing about Physics on ASRA. I have an assignment to write. It's incredibly boring.
James, you forget that I'm also a polymer engineer. I nerd out pretty easily.
Alex Gillis said:
Heat capacity really doesn't come into it either. Unless you were comparing which wheel variety heated up more. I suppose denser (harder?) wheels would have a greater heat capacity. You could test that.
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I'm meant to be studying for English...
When I was talking about size, I meant more in relation to wheel radius. A larger wheel will roll over a rough surface more easily (i.e. with less friction) than a smaller wheel, thereby generating less heat. I suppose you could throw heat capacity into it, but we're talking by comparing park wheels to downhill wheels. A 50mm will be far hotter than a 80mm at the bottom of the hill, and I think the size would make a larger difference than the mass. I could be wrong, true.
That specific equation is for calculating the energy taken to change the temperature of an amount of a certain substance by a certain increment. Unless you can theoretically work out the energy generated by the friction of wheel on a rough (read inconsistent) road per given metre at a given speed (bear in mind it's accellerating), that equation is pretty irrellevant.
God I'm a nerd. Where did you do polymer engineering? Still studying?
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Premium MemberPermalink Reply by m0juu on -
im still studying, dave is done and a teacher on top of that the best thing about graduating an engineer is being fairly troll proof.
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Premium MemberPermalink Reply by The Dave on -
UNSW. I graduated a while back (twice) but I spent so much time there it feels like my spiritual home, but now I teach Physics.
You're right, high rolling resistance means that more energy is absorbed by the wheels, or transferred to them. That amount of energy will heat a smaller (lower mass) wheel to a higher temperature than a larger one according to mcdeltaT if we assume the effect of urethane density and glassyness is negligible on the value of c. It's elementary, young feller-me-lad.
I assume you are studying the HSC, so you should get back to English and I should DEFINITELY finish this damn essay.
mojo, I know you're getting a sick thrill from following this conversation. Stop it or you'll go blind....
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Premium MemberPermalink Reply by The Dave on -
Oh, you've graduated have you?.... :P
By the way, give me your surf rodz if you want to pass this semester :D
Or are they munkaes? I can't remember. Whatever. I want some precisions. Hand em over.
m0juu said:im still studying, dave is done and a teacher on top of that the best thing about graduating an engineer is being fairly troll proof.
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Premium MemberPermalink Reply by m0juu on -
woah WOAH the closer i get the harder it is to exploit me not knowing. cant i just fix you up with custom bone implants?
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Graduated. Haven't finished HSC hahah, I did phys + chem last year though, hence my free time to waste on ASRA.
See, I figured the greater mass of the larger wheel would have a negligible effect compared to the lower rolling resistance.
The only way to figure that would be by using that equation though, so technically you were in the right ;)
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Permalink Reply by Billy Bott on
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just get some harder wheels. they will drop more. also, if u run trucks with a 10mm axel, you will have a tonne more grip. it also helps if you put your wheels in the freezer, half an hour before you skate to cool them down to optimum gripping temperature.
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u could also run your trucks backwards. this would be a sure guarantee of giving your wheels heaps more grip
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