[General] Fwd: Drag torque

[DavidM]

The only thing that comes to mind is torque=(hp*rpm)/5225 or somesuch.

David Merchant


Ethan Chew wrote:
> Good Evening,
>
>        I was wondering if you guys could help an inquiring young mind. 
>  Eric would like to know how to calculate the drag torque of a 
> cylinder rotating on a shaft (wheel and axle configuration in picture 
> attached).  He will be applying a certain torque to rotate the 
> assembly and is seeking a general equation that would tell him for the 
> certain torque what the rotational velocity would be after a certain 
> time, its maximum rotational velocity and how long it would take to 
> reach it.
>        Help would be appreciated.  Thanks!
>
>                - Ethan/spacefelix
>
> ---------- Forwarded message ----------
> From: *Eric Chew* <ericchew24 at gmail.com <mailto:ericchew24 at gmail.com>>
> Date: Sat, Jan 14, 2012 at 8:44 PM
> Subject: Re: Drag torque
> To: Ethan Chew <spacefelix at gmail.com <mailto:spacefelix at gmail.com>>
>
>
> Hey!
>
> So here's a simple picture of what I'm doing.
>
> Pretty much, I'm trying to rotate a cylinder on an axle, as shown in 
> the picture. I will be applying a certain torque on it, and I wanted 
> to find a general equation that would tell me what the velocity would 
> be after a certain time and also what the maximum velocity it could 
> reach would be and how long it would take to reach it.
>
> I talked with my physics teacher, and she told me that the equation I 
> put on the paper would give me a general idea, but that calculating 
> the drag torque would be difficult and that she didn't know how to. I 
> tried looking on my own and found a lot of equations for drag force 
> when something is moving, but nothing on when something is rotating in 
> place. Do you know of an equation for the drag torque? Or could you 
> help me derive one?
>
> Thanks,
>
> Eric Chew
>
>
> On Sat, Jan 14, 2012 at 4:49 PM, Ethan Chew <spacefelix at gmail.com 
> <mailto:spacefelix at gmail.com>> wrote:
>
>     Hello!
>
>           This is my business/technical contact.  Please use this
>     e-mail only for technical and business communication.  That being
>     said, can you send me a drawing of your device and how it operates
>     so I may understand how it is being loaded?
>
>                  - Ethan
>
>     On Sat, Jan 14, 2012 at 1:44 PM, Ethan Chew
>     <eflyingfelix at gmail.com <mailto:eflyingfelix at gmail.com>> wrote:
>
>
>
>         ---------- Forwarded message ----------
>         From: *Ethan Chew* <eflyingfelix at gmail.com
>         <mailto:eflyingfelix at gmail.com>>
>         Date: Sat, Jan 14, 2012 at 1:44 PM
>         Subject: Fwd: Drag torque
>         To: Ethan Chew <eflyingfelix at gmail.com
>         <mailto:eflyingfelix at gmail.com>>
>
>
>
>
>
>         ---------- Forwarded message ----------
>         From: *Eric Chew* <ericchew24 at gmail.com
>         <mailto:ericchew24 at gmail.com>>
>         Date: Sat, Jan 14, 2012 at 10:35 AM
>         Subject: Drag torque
>         To: Ethan Chew <eflyingfelix at gmail.com
>         <mailto:eflyingfelix at gmail.com>>
>
>
>         Hey Ethan,
>
>         I was wondering if you knew how to calculate the drag torque
>         of a solid cylinder, given the radius, width, and mass of it,
>         while it rotates on an axle in the air.
>
>         Thanks,
>
>         Eric Chew
>
>
>
>
>
>
> Picture0040.jpg
>
>
>
>
> _______________________________________________
> General mailing list
> General at lists.makerslocal.org
> http://lists.makerslocal.org/mailman/listinfo/general
>
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 2012.0.1901 / Virus Database: 2109/4751 - Release Date: 01/18/12
>


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1901 / Virus Database: 2109/4751 - Release Date: 01/18/12