Kids, pets and idiots in Dryers.

Recently there have been quite a few video's on Google and youtube where either kids did dares related to crawling into a drying and letting it run, or people being cruel retards and putting animals in dryers.

Most people talk about the heating in a dryer being deadly, but they are blisfully unaware about the G's something pulls in a dryer.

My dryer here at home has a top speed of 1500 rpm and the drum is 80cm diameter.

At the outside of the drum (r=40cm), the centrifugal force is over 100G's.
At r=20cm, its still 50G's.

If you put any pets in a dryer, you'll either give them brain damage and organ failure, or plain kill them.

With people being put into large dryers at the laundrymat, anyone have an idea of what speeds those things can run at and most importantly, what load they can operate with and what speed do they rotate at??

I've seen industrial dryers that have 100cm radiuses, but have no clue what the size of the laundrymat type dryers is.

And as I said, most importantly is the load they can take, if a person is to heavy for a dryer, the engine will either burn out or not get to its RPM rating.

And btw, if a laundrymat dryer is 100cm radius and also runs at 1500rpm, the force at the wall of the drum is 250G's :@


[edit on 19/3/07 by thematrix]

I like to call it natural selection in action.

Count yourself lucky you aren't one of the ones on the cut list.

Anyhow, most people don't have much of an understanding of physics. There's things out there that would either blow their mind... or they'd immediately declare it as an act of god... lol.

I agree. Most Americans are ignorant as to how the world of physics work. Ask them why they move to the outside of a marry-go-round and they say it is setripical force...there is no such thing!!!

I was browsing Google Video's scientific and educational video's a while back and saw that they have the full physics 801 course from MIT on there in 30 or so 1 hour video's.

For anyone interested in learning the basics of physics, take some time taking the classes virtualy.

Fun part I noticed about that video was that the guy teaching it is a dutch professor and that dude is funny as hell. Does alot of class experiments too, really nice.

uh....


i don't know about your dryer, perhaps an industrial version, but my home dryer does not in any way spin that fast. infact, i am confident i could easily spin around inside of one. these g forces you speak of put bluntly, are not the cause of injury. injury is cause by the moving agitators slamming into soft bodily tissue, OR by spinning up to the apex of the cylinder, and then falling into the spinning bottom by act of gravity.

I checked online if ours is fast somehow as you suggest and its actualy slow at 1500 rpm.

Dryers go from 1000 rpm for battery driven camper type dryers, to up and over 4000 rpm for powerful models.

Most household dryers have a capacity of 5 to 10kg, more then enough to fling around cats and small dogs.

I'm guessing the laundrymat type heavy duty ones will take 20-30 kg's, which is more then enough to have no problem carrying kids.

A full grown person I don't know, it depends on how much the engine is overengineered. If its weak, it'll burn because of the load.

Else your in for a hellride if it reaches full speed with you in it.

The drum will NEVER go above 200RPM. All you have to do is set the dryer to the run setting and defeat the door interlock so you can see it spin. Then watch just one of the paddles spin and count how many times it goes around in a minute. My dryer drum runs at 60-75RPM.

People and pets are too heavy and will fall before they reach the top, G's have nothing to do with it.

The motors in dryers will be a higher RPM, they have a small pully on the motor shaft and the drum acts as the large pully. Otherwise, the sheetmetal drum would have deformed and have no paint left.

[edit on 19-3-2007 by XL5]

Yada yada yada, show me the specs of a tumble dryer that goes at the speeds you guys are claiming.

Check "tumble dryer rpm" on google to find the speeds.


Also, if the speeds you are claiming are even remotely accurate, it would never be able to create the vibrations dryers show when all mass in the tumbler is focussed to one side.


[edit on 19/3/07 by thematrix]

Go check the RPM of your dryer right now, you do have one right? All common 115VAC motors are over 1000RPM and at start up, AC induction motors have a hard time with even small loads (compaired to DC motors).
The motors are NEVER connected to the drum directly with a ratio of 1:1, its closer to 25:1, the motor spins 25 times and the drum spins once.

Web sites selling stuff like to claim the highest RPM they can get away with as people like higher numbers, they seem to denote higher power. Why would they even need paddles if the drum spun that fast!

Everything is 220VAC here :p and I already said ours is rated at 1500 rpm.

The paddles (if there are any, in ours there aren't any paddles, only in our washing machine, in the dryer itst a grated drum) are possibly there to keep the load spread, keeping it from bundling in 1 spot.

I actualy watched our dryer trough an entire 120 minute program after replacing the heating element in it, checking the outlet duct to check the air was ok.

It starts out rotating slowly like your stating going left and right at maybe 60-70 rpm's switching in minute intervals for about 10 minutes, after which it goes into a high speed for about 5 minutes left, then 5 minutes right, and the speed is way way over the 1 to 1.1 rotations per second your stating. From the vibrations and sound of it, the 25 r/s that 1500rpm stands for would be about right.

And, if a light class dryer is rated at 5 kg loads and you put a 1kg hamster or 3 kg cat in it, I doubt the engine would have much problem hurling it around.

If the rpm's your stating is all dryers ever do, I'd have to ask why the hell they put weights at the bottom of the thing to keep it down, and how it would be possible for a dryer to vibrate away from its place at just 1 rotation per second.

They put weights in the bottom because ANY unballanced load will create a wobble at any RPM. Also, "normal" clothes dryers don't spin one way then the other as there is no point, washing machines spin back and forth.

If your clothes "tumble" in your dryer, that means that there is less then 1G as it is not enough force to keep your clothes from overcoming the 1G of earths gravity.

Originally posted by XL5

If your clothes "tumble" in your dryer, that means that there is less then 1G as it is not enough force to keep your clothes from overcoming the 1G of earths gravity.

exactly. well put. if the "tumble dryer" is to work to spec, clothes must "tumble" inside, no? ever put a pair of shoes in the dryer? if it spun at 1500rpm then you would never hear the SLAM;...SLAM;...SLAM;... you do with tennis shoes in a tumble dryer.

Regardless of the RPM if you climb inside of a dryer you are a moron. If you put an animal inside of a dryer you are a moron and a criminal.

eh, if you are big enough to contemplate whether it will hurt you or not, getting in the dryer is mostly harmless. if you chuck a baby or an animal inside however, things go ugly. personally i think its hilarious.

it doesnt matter how fast or slow the dryer goes its still cruel to put an animal in one if you want to have a go in one go for it but the animal gets no choice

OK time out !! As a Test Engineer for the worlds largest appliance maker. I can tell you nobodys dryer does 1200 rpm. End of story. Now the new horizonal axis washers will spin 1200 to 1500 rpm but not the dryers. A dryer has to tumble the cloths as someone has already stated 60 rpm or less. I will let you know the real numbers tomorrow. Also if it's been built we have it for testing.

mikell

Originally posted by kerrichin
it doesnt matter how fast or slow the dryer goes its still cruel to put an animal in one if you want to have a go in one go for it but the animal gets no choice

in no way did i condone throwing babies or animals into a dryer.

Originally posted by mikellmikell
OK time out !! As a Test Engineer for the worlds largest appliance maker. I can tell you nobodys dryer does 1200 rpm. End of story. Now the new horizonal axis washers will spin 1200 to 1500 rpm but not the dryers. A dryer has to tumble the cloths as someone has already stated 60 rpm or less. I will let you know the real numbers tomorrow. Also if it's been built we have it for testing.

mikell

This really does show the extent of expertise we have on ATS doesn't it. Every job is covered, what a great research tool ATS is.

Well if some muppet wants to get in one and spin around then yeah i say natural selection. If it's an animal or baby, well that's a very different issue and the person who does it should be sectioned as mentally unstable and a danger to the public.

Originally posted by johnsky
I like to call it natural selection in action.

Count yourself lucky you aren't one of the ones on the cut list.

Anyhow, most people don't have much of an understanding of physics. There's things out there that would either blow their mind... or they'd immediately declare it as an act of god... lol.

hahahah natural selection that's hilarious : )
So true really..

Originally posted by AlphaAnuOmega
I agree. Most Americans are ignorant as to how the world of physics work. Ask them why they move to the outside of a marry-go-round and they say it is setripical force...there is no such thing!!!

In Australia, we hear they call it seppotypical force.

Now I'm just being facetious, because you were, I hope..