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Manual crank chamber 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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Manual crank chamber fan?

Unread postAuthor: Cy4ka » Wed Mar 06, 2013 10:21 am

I am liking the idea of an entire cannon having absolutely no electronic components like batteries, etc.... just a piezo igniter and wondered also if it was doable to have a hand-cranked chamber fan somehow?

Has it ever been done? Could it be done? Like, with a crank and worm gear or something?
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Unread postAuthor: dewey-1 » Wed Mar 06, 2013 10:35 am

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Re: Manual crank chamber fan?

Unread postAuthor: jackssmirkingrevenge » Wed Mar 06, 2013 11:08 am

Cy4ka wrote:I am liking the idea of an entire cannon having absolutely no electronic components like batteries, etc.... just a piezo igniter


Hmmm... why not be a true purist and try and use a flint ignitor ;)

Also props to dewey for outsearching me :D
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Re: Manual crank chamber fan?

Unread postAuthor: dewey-1 » Wed Mar 06, 2013 11:26 am

[quote="jackssmirkingrevenge"][/quote]

Also props to dewey for outsearching me

How could one forget Fred's beautiful creation. :!:
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Unread postAuthor: Cy4ka » Wed Mar 06, 2013 5:02 pm

dewey-1 wrote:Yes it has, see fred's creation!


http://www.spudfiles.com/forums/semi-fi ... rt,15.html


:shock:

Oh, wow.

Where exactly did he get all that stainless pipe from? That's a small fortune right there. Holy pewp.

I would LOVE to get some thin wall steel and build an entire metal cannon but for now I'm using PVC on a metal frame.

I don't see how he did that fan though, it looks like a knob or something like a fishing reel type thing but I can't tell.
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Unread postAuthor: mark.f » Wed Mar 06, 2013 5:15 pm

Probably weighted a little to keep the blades' speed up.
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Unread postAuthor: Fnord » Wed Mar 06, 2013 7:14 pm

You could use the spring out of a tape measure to store energy from cranking. Hook one end to your crank and the other to a small step-up gearbox to drive the fan. Add a clutch pin so it only runs when you want it to.
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Unread postAuthor: POLAND_SPUD » Wed Mar 06, 2013 7:49 pm

why not use simpler methods ? put a lenght of chain inside and shake the gun prior to firing
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Unread postAuthor: Brian the brain » Thu Mar 07, 2013 1:17 pm

or a checkvalve-less small bikepump...

Best would be to add a tube to the chamber and run a rod with an O-ringed piston inside it.
It doesn't need to be able to suck in fresh air.
Just push and pull it to suck in and mix.
If you'd seal the pumprod, the piston itself could even be without seal.

With the pumprod extended you could fire the cannon without having a pumprod flying out..

The connection between this pump and the chamber could be made to cause turbulance...
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