Physics lessons
Professor Blankmann posted,
One huge misconception that skaters seem to
have is regarding the top speed of the wheel.
I'm not trying to preach from my high horse.
Knowledge is power.
With respect to wheel acceleration, due to
the mass moment of inertia, wheels with more
mass further from the centre will accelerate
more slowly.
This is barely noticeable. For example, let's
take 76mm zombie hawgs, whose centre of mass
is at about 68mm from the centre (r=0.068).
Using the formula for the rotaional inertia
is I=0.5mr^2, you can plug in to calculate
the inertia. Assuming the mass is
approximately the same in same sized Otang
Stims (r=0.058) , which don't have a hollowed
out wheel like the cheap fucks at Landyachtz,
you can see that the difference in inertia is
almost none. Especially when you consider the
inertia of the massive board on which your
wheels sit.
Also, people who say that small wheels "can't
go fast". What the fuck?! Can you provide
some sort of explanation as to why you
believe this? They may accelerate a tiny but
faster, but top speed is not determined by
wheel size, rather by air drag (which small
wheels have less!)
Don't say "they just do" =D
2011 February 28 12:12 AM
Cyno replied,
the two things that really limit speed are the quality of
the urethane, and the deformation of said urethane.
Also bearings.
i.e. kryptos are slow, coned wheels are slow, and
coned kryptos... don't expect to go fast.
2011 February 28 12:39 AM
ian replied,
well if your saying that all wheels have
the same rpm (rotatons per minute)then
wont the larger wheel go farther in one
rotation than the smaller one, because
it has a larger circumference? so all
wheel sizes spin at the same speed but
larger wheels will just cover more
distance in one rotation making them
faster? im not sure if im right just
putting that out there..