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questions

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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Unread postAuthor: BartoGhost » Fri Jul 18, 2008 7:47 am

for first thing I apologize me for the questions, because I would like to read the discussions to learn but since I am Italian and I have some problems with the English I hope you answer me. (I am using a translator)
then:
I have built my last Potato Gun whit PVC pn16 (I think that it is good considering that it withstands 16 BAR).
I have problem for find electric lighting... I have tried it has to build alone her modifying a lighting electric piezo but it worked one time out of 100.
can you give me suggestions on as to modify well her so that functions? when I sprinkle there the lacquer it stops making the spark...

the propane is dangerous? in alternative thing I could use?

does it serve the fan to the inside to what? to send away the gases? doesn't it break him with the explosion?

you excuse for the a little clear questions but I hope that with calm I succeed in understanding everything.

Image
165 yards around.
Image
is a elettric igniter modified a 9v and candle but i think it's not good.

165 yards around.
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Unread postAuthor: starman » Fri Jul 18, 2008 8:57 am

First off, the gun in the first picture appears to be a pneumatic type, not combustion. Secondly, while I'm not famliar with the ignitor you show in the second picture, if it produces a spark of almost any kind, it can usually be made to work in a spud gun....a spark is a spark. However, I'm not familiar with piezo ignitors that are available in Italy.

Yes, propane is an excellent fuel for spudgun use, but it is a little picky on the amount needed to ignite in your chamber. You'll need to measure small amounts of it in a device called a meter and inject it in your chamber. A fan is used to mix the air/propane to assist combustion. It also helps expel spent gases after combustion and draw in fresh air for the next shot. Be sure you use a brushless fan. Computer fans work great for this. Yes, the fan survives the combustion!

Go to the Burnt Latke website and read it from top to bottom. It is the de facto standard text for combustion spudguns and should give you several good ideas.
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Unread postAuthor: psycix » Fri Jul 18, 2008 1:49 pm

Most of your questions can directly be answered by reading the wiki.
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Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
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