10,000RPM is how fast??

[Shenkoa]

Ok, loosen the middle of a HDD Platter/s and then turn the HDD on connected to a AT PSU outside, let the the platter take off down the street!, how fast mathamatically would the platters go?

 

[Nikamichi]

42.

 

[NutBucket]

Assuming perfect traction?

 

[Shenkoa]

yes

 

[Heisenberg]

I'm assuming you mean let the platter roll down the street? You'd need to know the size of the platter to get the answer.

 

[jagec]

You're telling me that for a known platter diameter and rotational speed, you CANNOT figure out how fast it would go?

 

Originally posted by: Nikamichi
42.

 

[Shenkoa]

Originally posted by: Heisenberg
I'm assuming you mean let the platter roll down the street? You'd need to know the size of the platter to get the answer.

I wonder if there is a way to find out the platter size on the net somewhere?

 

[dullard]

Platter sizes vary (but lets assume it is just over 3" diameter for easy math). Thus you have about a 10" circumference, or it travels at 100,000" per minute.

Traction would be poor (but lets assume it is perfect). The motor wouldn't be able to handle the friction, but lets ignore that. It wouldn't be stable and would fall over, but lets ignore that. End result: 95 mph.

 

[njmodi]

Whats the diameter of each platter -> assuming 2.5", the circumference is pi*2.5, so the distance covered per minute is 10000 * 2.5 *pi inches, so the actual speed is 25000*pi/60 inches per second = 1308 inches/second = 74.33 mph. WOW!

Someone double check the math!

 

[HardcoreRobot]

10,000 revolutions in one minute

where one revolution (assuming a platter diameter of 3") covers a distance of = 2 * pi * r = ~10"

so thats 100,000" per minute

8333.333 feet per minute

~1.5 miles a minute

~90 miles per hour

 

[njmodi]

Originally posted by: dullard
Platter sizes vary (but lets assume it is just over 3" diameter for easy math). Thus you have about a 10" circumference, or it travels at 100,000" per minute.

Traction would be poor (but lets assume it is perfect). The motor wouldn't be able to handle the friction, but lets ignore that. It wouldn't be stable and would fall over, but lets ignore that. End result: 95 mph.

Beat me to it - same calculation as I did, except I used 2.5" diameter.

 

[91TTZ]

Linky Linkerson!

 

[MacBaine]

10,000 Rotations / Min * Circumferance... assuming perfect traction.

Did you miss that day in middle school?

 

[Shenkoa]

I think it would fall over but I dont think it would right away, assuming the platter was launched standing up perfectly and the ground was level.

 

[HonkeyDonk]

Originally posted by: dullard
Platter sizes vary (but lets assume it is just over 3" diameter for easy math). Thus you have about a 10" circumference, or it travels at 100,000" per minute.

Traction would be poor (but lets assume it is perfect). The motor wouldn't be able to handle the friction, but lets ignore that. It wouldn't be stable and would fall over, but lets ignore that. End result: 95 mph.

he's right...between 90-95mph.

 

[AyashiKaibutsu]

0 Mph the coefficient of friction and normal force aren't sufficent to move the HDD.

 

[piroroadkill]

As two guys said, you'd need the platter diamater to work this shi t out.

But it would be a mathematically pure answer and nowhere near what you would actually get in real life, due to the imperfections of the world, friction, drag, all sorts of crap.

 

[HardcoreRobot]

Originally posted by: Shenkoa
I think it would fall over but I dont think it would right away, assuming the platter was launched standing up perfectly and the ground was level.

its rotational inertia would keep it upright. the faster it travels the easier it is to stay upright. think, ridign a bike

 

[aplefka]

This is too theoretical for just waking up.

 

[MrBond]

That'd be the coolest case mod ever! A speedometer on the front of your case to show how fast the drives are spinning in miles per hour

 

[jagec]

Originally posted by: AyashiKaibutsu
0 Mph the coefficient of friction and normal force aren't sufficent to move the HDD.

Having performed the CD+Dremel experiment, I can tell you that isn't true. It will spin in place for a second, but then suddenly pick up speed and take off.

Obviously it won't get NEAR the theoretical speed, but it will CERTAINLY move.

 

[91TTZ]

89.2 mph for a 3" platter

111.3 mph for a typical 3.74" platter.

 

[jagec]

Originally posted by: MrBond
That'd be the coolest case mod ever! A speedometer on the front of your case to show how fast the drives are spinning in miles per hour

And you could have a little light that comes on and says "WARNING! Danger to motherboard!" if they go too fast?

 

[cavemanmoron]

eleventy billion
LOL