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Author Topic: How much weight is needed to create a certain amount of power?  (Read 7164 times)

Offline nirvana

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How much weight is needed to create a certain amount of power?
« on: September 21, 2007, 03:46:49 AM »
 Hi members,  how much unbalanced weight would be needed on one side of a wheel to be able to run a 5kw generator.
  Lets say the diameter  of the wheel is 2 meters, and spins at 100 RPM.
  So this would need to be geared  up dramatically to run a generator, ( lets say a 20 to 1 gear  ratio)?
  I dont have a clue how to work this out, but i am assuming you would probably need at least a few tonns of difference on 1 side of the 2 metre wheel.
  Also what happens if the revs of the wheel was 500 RPM, (with a 4 to 1 gear ratio to run the generator). ?
  Would it be uniform and  need 5 times less weight ?

 Thanks.


   
   

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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #1 on: September 21, 2007, 12:28:45 PM »
ok  lets see.....You want 5Kw from a 2m Diameter unbalanced wheel so................................................
Assuming clockwise rotation of the unbalanced wheel the weight needed to balance and stop rotation of the wheel positioned at 9oclock would be the mass used to work out the Potential Energy of the system.Potential Energy is mass * gravity * height and is measured in joules.5Kw is 5000 joules per second.So 5000=mass*9.8*1    The height of 1m being the fall from 3oclock to bottom of rotation.Therefore the mass is 5000/9.8=510.2kg.....................................................................................
« Last Edit: September 21, 2007, 09:16:03 PM by mapsrg »

Offline usama salah

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Re: How much weight is needed to create a certain amount of power?
« Reply #2 on: September 21, 2007, 07:39:14 PM »
 ok , if the wheel do its complete rotation at 15 seconds , and i need to run a 25kw generator at 100 RPM , SO how much weight i must use at one side ? and what is the gear ratio i have to use to geared it up ? assume this geared up will need extra work power or weight.

if you please solve it in details
thank you

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Re: How much weight is needed to create a certain amount of power?
« Reply #2 on: September 21, 2007, 07:39:14 PM »
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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #3 on: September 21, 2007, 09:08:15 PM »
......@510.2 kg............rotation ? rpm.....Thats a lot of weight ?As a guess rpm would be up to 240 maximum.
« Last Edit: September 21, 2007, 10:07:42 PM by mapsrg »

Offline hansvonlieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #4 on: September 21, 2007, 09:12:06 PM »
G'day all,

Isn't this all a bit academic? Seeing that no-one has gotten a wheel to RUN (at least convincingly so with replications) wouldn't it be wiser to achieve that before trying to work out how many weights one needs for x amount of horsepower?

Hans von Lieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #4 on: September 21, 2007, 09:12:06 PM »
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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #5 on: September 21, 2007, 09:26:59 PM »
Using many smaller weights on a larger wheel would be advisable....see imbalance wheel in "half baked ideas"........the illustration i posted shows 12 smaller wheel mounted weights but it can be 10 times that number.Potential Energy from a certain amount of weight in may be less due to losses so the weight figure may need to be slightly more to make these up.....

Offline hansvonlieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #6 on: September 21, 2007, 09:37:02 PM »
G'day all,

Is that the image you are talking about??

Hans von Lieven

(http://www.overunity.com/index.php?action=dlattach;topic=2707.0;attach=12118;image)

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Re: How much weight is needed to create a certain amount of power?
« Reply #6 on: September 21, 2007, 09:37:02 PM »
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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #7 on: September 21, 2007, 09:39:39 PM »
A 25Kw unit on a 10m diameter wheel will require 510.2Kg.......plus extra weight to overcome losses.

Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #8 on: September 21, 2007, 10:10:23 PM »
Yes thats the image......thanks for that.

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Re: How much weight is needed to create a certain amount of power?
« Reply #8 on: September 21, 2007, 10:10:23 PM »
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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #9 on: September 21, 2007, 11:00:03 PM »
The rpm problem........if in the calculation gravity is in metres per second then a quarter turn from the 3oclock position must take 1 second........so a full rotation will take 4 seconds??Or is it gravity will cause the weight to rotate around the wheel 9.8 metres of circumference in 1 second?................... ???

Offline hansvonlieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #10 on: September 21, 2007, 11:14:52 PM »
Question to mapsrg,

How does your wheel produce rotation, what energy are you using to turn those little wheels of yours around?

Hans von Lieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #10 on: September 21, 2007, 11:14:52 PM »
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Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #11 on: September 21, 2007, 11:35:54 PM »
The smaller wheels,d,are free to rotate on the larger wheel,W......The smaller wheels have a magnet mounted on half there faces.These magnets interact with external magnets,2, in repelling mode to guide them around the paths shown.At top and bottom of rotation the smaller wheels are repelled so as to cause a continuation of imbalance  of the larger wheel............by either rotating to a path further or nearer the center of rotation of the larger wheel.

Offline hansvonlieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #12 on: September 22, 2007, 03:43:45 AM »
You need a very strong magnetic field to turn the wheel 180 degrees. How do you propose to cancel the opposing forces? And don't forget you have to do this top AND bottom. Where is the energy coming from to do this with? You only have 30 degrees of movement to gain the inertial energy and very little imbalance. I am being generous here and not count losses in friction.

Hans von Lieven

Offline mapsrg

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Re: How much weight is needed to create a certain amount of power?
« Reply #13 on: September 22, 2007, 04:03:57 AM »
I tested the repelling magnets on a small disc type wheel of 100mm diameter brought into proximity of a fixed external magnet and it was repelled to turn into its new path.I used ceramic magnets in the experiment.the disc was made of aluminum of 2mm thickness with ceramic magnets superglued to one half of its face and was free to rotate.

Offline hansvonlieven

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Re: How much weight is needed to create a certain amount of power?
« Reply #14 on: September 22, 2007, 04:18:56 AM »
How do the magnets stay in their positions once turned??

Hans von Lieven

 

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