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Storm



Joined: 22 Mar 2008
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PostPosted: Wed Aug 06, 2008 3:45 pm    Post subject: Science and technology question Reply with quote

I'm building a cardboard wind tunnel for someone I'm interning for. The tunnel is built, and everything works, but the fan is a mystery fan. I need to find the CFM that an old 22", five-blade box fan moves. It's six inches deep and I think it's a Galaxy fan, from the 1989-90 manufacturing year. It's a three-speed fan, and it looks exactly like this Linky except for the fact that the speed knob broke off long ago. I can't find the product manual, original packaging, or a part number that gets me anywhere that helps.

Does anyone know the formula to find CFM of a fan? I know how to convert CFM to airspeed, but I need the first number.
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Asa



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PostPosted: Wed Aug 06, 2008 3:57 pm    Post subject: Reply with quote

Try going to www.tinyurl.com and shorten that link, it's so long that it doesn't work.
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thespaceinvader



Joined: 23 Mar 2008
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Location: Cardiff, UK

PostPosted: Wed Aug 06, 2008 4:06 pm    Post subject: Reply with quote

Nah, it doesn't work cos it's a IMG link and the file type is not an image.
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Asa



Joined: 10 Apr 2008
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Location: Grammar Police HQ. Watch your language, I'm armed with the NYTimes Style Book AND Strunk and White!

PostPosted: Wed Aug 06, 2008 5:06 pm    Post subject: Reply with quote

Oh. But usually, the link will still work, just not the img tags, I thought?
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Keeper of the Library and the Gateway to Haven

Nem: "It's the sort of face you just know is getting ready to poke you with something sharp."
BS: "...then insist you eat a brownie."
__________________
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Think but this and all is mended...
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Tyris



Joined: 14 Apr 2008
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Location: Beneath a vast mound of curly hair

PostPosted: Wed Aug 06, 2008 5:16 pm    Post subject: Reply with quote

The image wanted is http://lh4.ggpht.com/_9M-0_ybkxtA/RxK5eilfKJI/AAAAAAAAAEU/wh2uD4W4IQU/P1000578.JPG rather than that ridiculous Googly link.

But anyway... don't know a standard formula, but you could always just measure it. Find a nice long windsock-like bag, measure its dimensions, time how long it takes the fan to inflate it, then divide volume by time. It won't be fully accurate because resistance will increase at the end, but hey, better than nothing, right?

Speed measurements are so much easier when the fluid is a liquid...
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theBSDude



Joined: 09 Jul 2008
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Location: The boring part of Washington

PostPosted: Wed Aug 06, 2008 5:19 pm    Post subject: Reply with quote

Tyris wrote:
The image wanted is http://lh4.ggpht.com/_9M-0_ybkxtA/RxK5eilfKJI/AAAAAAAAAEU/wh2uD4W4IQU/P1000578.JPG rather than that ridiculous Googly link.


...Except that just gives me a 404 error.
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Asa



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PostPosted: Wed Aug 06, 2008 5:23 pm    Post subject: Reply with quote

And this h-scrolling is ridiculous. Can someone please fix that link so it's small?
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Keeper of the Library and the Gateway to Haven

Nem: "It's the sort of face you just know is getting ready to poke you with something sharp."
BS: "...then insist you eat a brownie."
__________________
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Think but this and all is mended...
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And Robin shall restore amends.
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thespaceinvader



Joined: 23 Mar 2008
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Location: Cardiff, UK

PostPosted: Wed Aug 06, 2008 5:42 pm    Post subject: Reply with quote

Done. But get firefox 3. No h-scrolling issues over here =D it seems to cope with them automatically.
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Asa



Joined: 10 Apr 2008
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PostPosted: Wed Aug 06, 2008 5:45 pm    Post subject: Reply with quote

Well I'm getting a laptop in a few days, so we'll see about it then.
_________________
Self-styled Forum Grandmother, because I hand out nicknames and hugs whether you want them or not. ^_^

Keeper of the Library and the Gateway to Haven

Nem: "It's the sort of face you just know is getting ready to poke you with something sharp."
BS: "...then insist you eat a brownie."
__________________
If we shadows have offended,
Think but this and all is mended...
Give me your hands if we be friends,
And Robin shall restore amends.
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Tyris



Joined: 14 Apr 2008
Posts: 877
Location: Beneath a vast mound of curly hair

PostPosted: Wed Aug 06, 2008 6:37 pm    Post subject: Reply with quote

theBSDude wrote:
Tyris wrote:
The image wanted is http://lh4.ggpht.com/_9M-0_ybkxtA/RxK5eilfKJI/AAAAAAAAAEU/wh2uD4W4IQU/P1000578.JPG rather than that ridiculous Googly link.
...Except that just gives me a 404 error.
It's working for us...
*hard refresh*
...aaaaaaaand now it isn't.
*follows Storm's link again*
But that page is still there...
Meh, whatever. The point of the thread was volumetric flow rate, which this has nothing to do with...
_________________
You can't look dignified when you're having fun.
Dubbed "Tetris" by Asa... apparently.
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Storm



Joined: 22 Mar 2008
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Location: Behind your shoulder... POOF!

PostPosted: Thu Aug 07, 2008 10:16 pm    Post subject: Reply with quote

Um, guys? The windsock idea didn't work. The fan's too powerful. That's why I really need help here. And sorry about that link, but it's the best I could do.
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Dubbed "Poodle" by Asa and "Teh Stormy Poodle" by Ponce
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