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Fuel and stuff

A place to ask general spud cannon related questions.
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Fuel and stuff

Unread postAuthor: SpudMania » Sat Sep 23, 2006 1:36 pm

i made this mini potato cannon

- Tiny bottle

- Sparker from a lighter *the ones that you click*

- And 2 thumb tack like things.

What are theese for?

Bic pen for barrel

And whats the best fuel cause i cant get duff to work.

Whats the best fuel and why wont this work.
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Unread postAuthor: schmanman » Sat Sep 23, 2006 1:37 pm

Pics would be nice.
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Unread postAuthor: SpudMania » Sat Sep 23, 2006 2:19 pm

Sorry for bad pictures my webcam is kinda on the downside and my dads phone cant get connected :(

Hope theese pictures are ok

http://img182.imageshack.us/my.php?imag ... 004jm1.jpg

http://img60.imageshack.us/my.php?image ... 002pn3.jpg
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Unread postAuthor: SpudMania » Sat Sep 23, 2006 2:29 pm

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Unread postAuthor: JoeSmoe32 » Sat Sep 23, 2006 3:04 pm

It's hard to tell from the pic but it looks like your thubtacks are waaay too far apart. Try putting them together more.

So if you look at a cross-section of your bottle the thumbtacks look like this

\ /

You need the gap inbetween them to be just a few mm
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Unread postAuthor: schmanman » Sat Sep 23, 2006 3:15 pm

wow, big chamber to barrel ratio! that's not bad or anything, though.
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Unread postAuthor: SpudMania » Sun Sep 24, 2006 6:35 am

What does the thumb tacks to? and my new one isnt working :( and im using Lynx
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Unread postAuthor: SpudMania » Sun Sep 24, 2006 7:13 am

http://img241.imageshack.us/img241/5638 ... 010jj6.jpg

This one wont work :( and why does the thumb tacks need to be together i no that you conenct ignitor to it then poke it in bottle but anything else?
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Unread postAuthor: JoeSmoe32 » Mon Sep 25, 2006 6:15 pm

Sorry I havn't replied back...

The thumbtacks need to be close together so the spark can jump the gap and ignite the gas inside the chamber. I can't really tell from your pic if they are close enough or not. Try to get a pic of the inside of the bottle.

One wire from the sparker to each thumbtack right? Does the sparker work? Try putting the 2 wires coming out from it on ur finger and click it.

I made a mini combustion out of a pill bottle and the hardest thing to do was to get the sparks from not jumping to eachother outside the chamber and getting the fuel mixture right. You have to use a LOT less than you think you do.
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Unread postAuthor: plumpthumb » Mon Sep 25, 2006 6:35 pm

Hey Spudmania!
The guys are right, the tacks should be much closer-in fact shoulder to shoulder or about 1/8" on the tips of the tacks. Next I would use any of the great air fresheners such as Oust or even a cheapy such as Glade. Experiment with the amount you need. Sometimes I have found more is
better contrary to normal practice. Just play around with the amount and
enjoy the pleasure of experimenting. I have a mini that will blow the socks
off some of my larger guns and I found it would use a lot more than was the
usual.
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