Spin Speed Measured by Stroboscope!

[kb0nes]

Kevin and all,

The calculation for the relative G-Force is really pretty simple, here is the formula

G Force = (RPM/1000)^2 * 28.4 * Radius in Inches

You can swap the number 28.4 for 1.118 if you want to input the tub radius in millimeters.

So if I go ahead and calculate based on this information

Unimatic 1167 RPM with a 10" tub radius I get 386 G

Hoover TT at 2222 RPM with a tiny 3-7/8" Radius develops 543 G

WP Combo 205 RPM with a 14-1/2" radius develops a mere 17 G!

Indeed an increase in the radius of the spinning drum does directly increase total extraction G force. But changes in RPM alters the total G force at the square of the speed change so RPM is more important overall. This is the reason that small high RPM spinners do extract so well. If you could only get that big tub in the Whirlpool combo to spin at 1150 RPM it would develop more extraction G forces then even that little Hoover TT at nearly twice the RPM! Alas you couldn't pay me to be in the room with it doing that.

Its a neat test all in all, course the true proof in the pudding would be the as extracted weight of a reference load of rags. A longer spinning cycle time will likely make up for lower extraction forces etc.

Attached is a Nomogram I found on the web to calculate G-forces. Also here is a link to an online calculator if that makes things easier:

http://www.calctool.org/CALC/phys/newtonian/centrifugal

 

[blackstone]

Old Strobe Light

One picture with flash, to show the strobe light; one without, to show the fan blade. Low speed on the fan was about 850 rpm.

I seem to remember the spin speed on Blackstones to be in the vicinity of 600 rpm.

 

[kitty]

How fast does a easy spinner go? Congrats on marriage.

 

[strongenough78]

I was wondering, could the reason behind the faster than advertised spin speeds be because the tubs were empty? Or would they spin at the same speeds full of wet clothes? It seems like the added weight would slow them down a bit, but then I'm thinking it wouldn't. What do you think?

 

[mickeyd]

NEW MATERIAL ! YAY !

Eugene Frigilux ~ the Frigidaire spinning in the 600's is a Pulsamatic, which pulsates and spins at an rpm of 660 ish. The doctrine explains this double 660 stuff. Re-reading carefully I see you got it. There is a reason for the identical speeds, but I don't have it mastered.

Kitty ~ An Easy Spin spins at 900

Guys ~ you look wonderful and it's so nice to have something new under the sun. Though we live and die for Whirlpool/Kenmore, their spinning is truly tragic. Was just lamenting that interesting reality moments ago as I had the whole hood up on the Mark XII spray rinsing

 

[kb0nes]

Vern,

Ultimate steady state spin speed isn't likely to vary much loaded vs unloaded. Loaded the increased inertia will cause the basket to spin up slower but eventually it will reach the same RPM. The only reasons it wouldn't would be due to increased aerodynamic drag from the clothing or higher bearing drag due to weight or imbalance. If the imbalance is significant perhaps the belt or clutch could slip a bit more which would reduce spin speed. It would be an interesting thing to do to see if theory and practice meet though!

I've had the same discussion with car/motorcycle guys that think a lighter car will have a higher top speed. It will accelerate faster due to the reduced inertia but top speed is unchanged as it is only modified by drag and frictional losses.

 

[washerlover]

So I guess...

we will never know who got married??

 

[countryguy]

Robert, the webmaster and creator of this site, married his partner Fred.

Gary

 

[revvinkevin]

 

 

Actually Gary, Robert is both the site creator AND the webmaster.

 

Todd, there is a thread about them getting married in As The Tub Turns....

 

Kevin

 

[mickeyd]

Actually, Correctoman, Gary just said exactly that.  

 

Message in Photo # 19, the last one of the four great friends, founders,  and REAL bosses of Aworg (although you'd never know it or hear it from them) : You can take being single out of a guy, but you can never take the washer out-- EVUHHHH. 

 

 

[strongenough78]

Phil,
Thanks for clarifying that for me. I was thinking the same as you explained it, but wasn't too sure. Thanks again

 

[countryguy]

LOL thanks MickeyD! I actually looked back and made sure that what I had written was correct.

Gary

 

[76speedqueen]

Congratulations !

Robert and Fred !!!!

 

[frigilux]

mickeyd-- On the Pulsamatic: I'm not quite sure how I missed it the first time.  It's right there in big black letters.  Plus the different agitator should have been a dead giveaway.  I glanced at the cycle dial and just assumed it was a Unimatic.  Sloppy attention to detail = my embarrassment, LOL.