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Micro fan

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Micro fan

Unread postAuthor: elitesniper » Tue Feb 05, 2008 8:12 pm

Hey guys would this fan fit 2'' sch 40 pvc,
[/url] http://www.radioshack.com/product/index ... =techSpecs
Product Length 1.57
Product Height 0.39
Product Width 1.57

and the pipe I.D for 2'' says 2
2.375

2.049

.154

.682

280

but i dont know if the fan will fit, I wana find this out before i buy it, help guys please :roll:
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Unread postAuthor: potatoflinger » Tue Feb 05, 2008 8:27 pm

I think it should fit, but it's gonna be pretty close. I'm not sure if the math I used was the math I was supposed to use, but I found that the diagonal length of the fan is less than 2.3", so it will fit (if the diameter of 2" pipe really is 2.375)

I would get the fan, you could even grind down the edges a little bit if you had to.
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Last edited by potatoflinger on Tue Feb 05, 2008 8:30 pm, edited 1 time in total.
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Unread postAuthor: elitesniper » Tue Feb 05, 2008 8:28 pm

ah thanks i gotta search around more cause that fan is a bit pricey dont ya think?
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Unread postAuthor: potatoflinger » Tue Feb 05, 2008 8:30 pm

Well isn't everything RadioShack sells overpriced?
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Unread postAuthor: elitesniper » Tue Feb 05, 2008 8:32 pm

yea very true but i cant seem to find any other stores but your pretty sure the fan could fit 2'' sch 40 with a bit of grinding ? mabey frys electronics has one.
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Unread postAuthor: psycix » Wed Feb 06, 2008 5:56 am

Yup think it would fit in.
Maybe check your local "computer store" they may have those for cheaper prices too.
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 06, 2008 6:05 am

You can very easily get a cheap electric motor from an old toy etc. and make your own fan out of soda can aluminium, secure it with a bit of epoxy and you're good. Remember, all you're trying to do is stir up the air, perfect fan blade dynamics aren't really an issue.

Indoor model aircraft makers fabricate their own propellers all the time, it's easy to use the same techniques.
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Unread postAuthor: Hotwired » Wed Feb 06, 2008 6:23 am

Pretty much all motors in toys are brushed so maybe not such a good idea unless the motor is somehow outside the chamber.
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 06, 2008 6:44 am

Hotwired wrote:Pretty much all motors in toys are brushed so maybe not such a good idea unless the motor is somehow outside the chamber.


Or you could simply block off the cooling vents to isolate the brushes from the propellant, the motor is only going to run for a few seconds before firing anyway so it's not going to overheat.
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Unread postAuthor: psycix » Wed Feb 06, 2008 11:15 am

Or make a handle outside the chamber so you can rotate it by hand! :P
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Unread postAuthor: jimmy101 » Wed Feb 06, 2008 4:58 pm

If it has square corners it won't fit.

The photo at radioshack shows rounded corners. It doesn't look to me like the corners are rounded enough to fit without modification. It should be pretty easy to grind the corners down enough to get it to fit.

It'll fit sideways easily. :D
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Unread postAuthor: elitesniper » Wed Feb 06, 2008 5:06 pm

so your saying it will fit with some grinding right?
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Unread postAuthor: jimmy101 » Wed Feb 06, 2008 6:36 pm

elitesniper wrote:so your saying it will fit with some grinding right?
yes
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Unread postAuthor: elitesniper » Wed Feb 06, 2008 6:40 pm

im getting my fan on the weekend, so when before i fire i turn on the fan so the air pushes > to the front of the chamber , then before i fire i turn the fan off? or leave it on while i fire? then when im done firing i open the back and turn the fan on again? but this time when i turn it on to vent does the fan have to reverse so the air gets sucked out of the chamber? or the fan is still running its regular position witch is > way to the front of the chamber.
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Unread postAuthor: psycix » Thu Feb 07, 2008 9:03 am

A fan cant run in reverse.

But you should run it during mixing AND firing since having it on during fireing increases burn speed due turbulence.
For venting just keep it on, it doenst matter wich way.
Either if you blow the burnt air out of the barrel or suck it out of the back, its the same thing.
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