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cheap and efficient venting system ... maybe ...

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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cheap and efficient venting system ... maybe ...

Unread postAuthor: nightshot » Thu Dec 20, 2007 6:09 am

i will build a combustion spudgun with propane regulator and a venting system, but i was thinking if is possible to make a cheap and efficient venting system, a fan goes very weel, but i want a venting system that don't need to open the chamber ....
so... how about this one:

Image

yes, a air pump..

Image
(click to enlarge)
very simple but i think it work right ?
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Last edited by nightshot on Thu Dec 20, 2007 6:59 am, edited 1 time in total.
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Unread postAuthor: BigGrib » Thu Dec 20, 2007 6:35 am

you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.
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Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
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Re: cheap and efficient venting system ...

Unread postAuthor: Hubb » Thu Dec 20, 2007 6:39 am

nightshot wrote:...but i want a venting system that don't need to open the chamber ....


How about this one?

You will still want a fan for performance purposes.
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Re: cheap and efficient venting system ...

Unread postAuthor: nightshot » Thu Dec 20, 2007 7:57 am

BigGrib wrote:you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.

maybe 10 pumps ??? o.O


hubb017 wrote:
nightshot wrote:...but i want a venting system that don't need to open the chamber ....


How about this one?

You will still want a fan for performance purposes.


how that thing works ?
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Re: cheap and efficient venting system ...

Unread postAuthor: Hubb » Thu Dec 20, 2007 8:04 am

nightshot wrote:...
hubb017 wrote:
nightshot wrote:...but i want a venting system that don't need to open the chamber ....


How about this one?

You will still want a fan for performance purposes.


how that thing works ?


Like this
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Unread postAuthor: VH_man » Thu Dec 20, 2007 8:37 am

why doesnt someone make a pneumatic to vent their combustion? lol.

still, go with the exhaust fan thing............ its not that hard to make.

hell, all you really need is a check valve in the back. then just turn your fan on and WALA it sucks in air..........

either that or just put a ball valve back there.
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Unread postAuthor: fred » Fri Dec 21, 2007 3:03 am

If you look in the album, I had submitted a simple hand operated mixing and exhaust fan. I have 3 guns with that fan. It takes a few spins on the weighted knob.
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Unread postAuthor: nightshot » Fri Dec 21, 2007 3:42 am

sunday i will buy the parts to build my advanced spud, so... I think i will use a pc fan...
but i really want a quick exhaust system :twisted: :P
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Re: cheap and efficient venting system ...

Unread postAuthor: BigGrib » Fri Dec 21, 2007 4:03 am

nightshot wrote:
BigGrib wrote:you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.

maybe 10 pumps ??? o.O


10 pumps my arse, and you would rather sit there pumping that damn thing than open a ball valve on the back of the cannon and flip a switch to turn on the fan wait 5 seconds close the valve and inject the propane. i'm not a bettin man but i'd go with the fan and ball valve.

why is it that you don't want to open the chamber between shots. i mean come on
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Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
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Unread postAuthor: flamerz14 » Fri Dec 21, 2007 10:58 pm

OR, you could use the bike pump as the chamber. keep the handle there as a stock and then you can easily vent out the gases.Put a pin through the handle to stop it from moving when fired.
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well, this isn't much isn't it?

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