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SpudFiles Forum Index » Combustion Cannon Discussion » Fully Automatic potato cannon project.
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Conrad2468
PostPosted: 08/23/2010 22:08 PM    Post subject: Reply with quote

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Joined: 08 Jul 2010
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Okie dokey, im back lol. were using a venturi effect nipple to siphon air into the system AKA a ton of holes. Ive got pictures of the (now outdated) gas injection/ignition system. Heres how it goes from RIGHT to LEFT.

0821180605


Propane tank> Vinyl hose (rated for 3X less pressure than it is under)>two solenoids (for backup/redundancy)> Several reducers to get from 1/2 to 1/4" (hardware store was out of direct stuff if they make it)> propane regulator>reducer>Special nipple*> screw cap/ignition system**

*We took a brass plug (the tip of the torch) and drilled a larger hole through it. We later surrounded it in JB weld and stuck it in the 1/4" nipple (http://en.wikipedia.org/wiki/Injector we have method to our madness) After that we drilled a hole through the nipple and angled it so we could get a more direct flow (this was just straight intuition). I can get a pretty large flame 1-3' fireball and its sucking in air because the flame is right at the end of the nipple.

**Not pictured but upgraded tonight with an ignition coil (thanks dad!) and a spark plug. Not yet tested.
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ramses
PostPosted: 08/24/2010 8:20 AM    Post subject: Reply with quote

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Nice!

I have those same shoes I think. Very Happy

It is worth noting that venturies generally don't perform well with much back pressure. Someone on here filled a homemade stirrup pump from a venturi and used it for hybrid metering. If I remember right, it worked!
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Technician1002
PostPosted: 08/24/2010 11:01 AM    Post subject: Reply with quote

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Slightly off topic. 2 minute edit with a free photo editor fixes the toes quickly.

If you can't afford Photoshop, The Gimp is free.

cannon.jpg
 Description:
Select area, chose crop to selection, save done.
 Filesize:  57.33 KB
 Viewed:  27 Time(s)

cannon.jpg
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Conrad2468
PostPosted: 08/24/2010 17:34 PM    Post subject: Reply with quote

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The "toes" were sort of a size estimation. And I figured out about the backpressure thing when we had the second solenoid hooked up to the end of the chamber (right next to our venturi nozzle) thats why i moved it back.
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