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many probs

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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many probs

Unread postAuthor: drunkii » Thu Jul 17, 2008 2:50 pm

hii , im 15years and i like shooting on things with guns:d
sow i want to make a Fking hard spudgun:d
but i have a few problems
okej , i had build a spudgun , with a ; barrel , combustion chamber , something to screw on the end of the combustion chamber , a piezo ingiter and a potato

first , when i installed the ingniter .. it didnt go
then ! i used a bbq lighter , and i maked a hole in the combustion chamber what i used to ingnite the spudgun with the bbq lighter ...

pooaf , i shooted and the screw on the end of the chamber exploded ( 2 times !! , i buyed a new thing and i exploded again)

NOW !!! , i have glued the screw on the combustion chamer , ( against the explosions)
and now , i use the hole into the chamer to ingnite the spudgun with the bbq ingniter , AND to load the chamber with fuel ( hairspray)

it doesnt wok always:s ,but somethimes , it really gives a , POOOaafff , a dammmn hard noise:D
like it!
but the potato didnt flyed in the air.. :s weird
but , the potato isnt that big as the barrel , it is a little bit smaller , sow there can be air between the potato and the barrel

what can i do ?i dont know what i have to do =p
srry for bad english im from belgium :)
now i will load up my pics :)
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Unread postAuthor: kablooie » Thu Jul 17, 2008 2:59 pm

I'd say the hole in you chamber and the loose fit of the potato are what are sapping your power. So if possible, plug up the hole with something (but it sounds like you have a bad end cap, so I don't know..) and get a bigger potato and put it in your barrel. You can sharpen the end of your barrel to cut the potatoes exactly right.

Do some major searching and looking around. This is simple stuff.
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Unread postAuthor: iisthemuffin » Thu Jul 17, 2008 3:00 pm

Im not even sure if i should be helping you. I feel so unsafe.

Well i would first read about spudgun safety if i were you. It doesnt seem like you know much about it. Theres all kinds of things here on the forum.

Also, did you install the ignitor correctly? You must have 2 screws going into your chamber to create a spark gap. Once again, planty of stuff on the forum desrcribing how to install this.

Also, if something blows off of your cannon...THATS BAD. The fix is not to permanently adhere it to the cannon. Clean out caps do often blow off. That is if you are using one. Possibly try using one with more threads if you need to.

Ill look at the pictures your uploading and see if i can help more. If i cant, im sure someone else can.
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Unread postAuthor: drunkii » Thu Jul 17, 2008 3:04 pm

Image
the barrel
Image
combustion chamber with hole to ingnite with bbq ingniter and to load it with hairspray
Image
spudgun :)
Image
screw on the end of the combustion chamber ( glued after explosion)
[/img]
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Unread postAuthor: drunkii » Thu Jul 17, 2008 3:07 pm

iisthemuffin wrote:Im not even sure if i should be helping you. I feel so unsafe.

Well i would first read about spudgun safety if i were you. It doesnt seem like you know much about it. Theres all kinds of things here on the forum.

Also, did you install the ignitor correctly? You must have 2 screws going into your chamber to create a spark gap. Once again, planty of stuff on the forum desrcribing how to install this.

Also, if something blows off of your cannon...THATS BAD. The fix is not to permanently adhere it to the cannon. Clean out caps do often blow off. That is if you are using one. Possibly try using one with more threads if you need to.

Ill look at the pictures your uploading and see if i can help more. If i cant, im sure someone else can.

im really really sure that i do it good;)
cause in the begin .. it works with the normal igniter.. after a few times , it didnt works anymore
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Unread postAuthor: drunkii » Thu Jul 17, 2008 3:10 pm

ohw and , the bbq igniter really works , but somethimes , in the hole in the combustion chamber... there wont come a FLAME
:s
maybe cause there is to many air or somthing?
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Unread postAuthor: iisthemuffin » Thu Jul 17, 2008 3:10 pm

Oh, well thats an easy fix. Clean your screws off.


OH MAN!

Please do not tell me you taped that cannon together? You do realize that your making a chemical explosion inside of that thing right? One that could cause some serious burns if it were to blow through that tape. (which im sure will happen.)

I suggest buying pvc primer and cement.....
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Unread postAuthor: drunkii » Thu Jul 17, 2008 3:14 pm

iisthemuffin wrote:Oh, well thats an easy fix. Clean your screws off.


OH MAN!

Please do not tell me you taped that cannon together? You do realize that your making a chemical explosion inside of that thing right? One that could cause some serious burns if it were to blow through that tape. (which im sure will happen.)

I suggest buying pvc primer and cement.....

haha , lol
afcorse i didnt taped that thing together:D
i glued it with pvc cement , and than i taped it over the glue ;)
cause i like taping :p

sow when i see a spark , and the chamber wilnt ignite , i just have to clean my screws?
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Unread postAuthor: iisthemuffin » Thu Jul 17, 2008 3:48 pm

Oh you said you do see a spark but it wont ignite?
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Unread postAuthor: drunkii » Thu Jul 17, 2008 3:54 pm

iisthemuffin wrote:Oh you said you do see a spark but it wont ignite?

indeed;)
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Unread postAuthor: Pilgrimman » Thu Jul 17, 2008 3:58 pm

If it doesn't ignite, 9 times out of 10 you are using too much fuel. If the mixture is too rich (too much fuel) it won't combust. You really should cast a layer of epoxy over the endcap to prevent blowouts. Leave a hole for the fuel, though.

Why does the potato not fit in the barrel?
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Unread postAuthor: drunkii » Thu Jul 17, 2008 4:03 pm

Pilgrimman wrote:If it doesn't ignite, 9 times out of 10 you are using too much fuel. If the mixture is too rich (too much fuel) it won't combust. You really should cast a layer of epoxy over the endcap to prevent blowouts. Leave a hole for the fuel, though.

Why does the potato not fit in the barrel?

but, outof the bbq igniter intO the chamber ... comes no flame
normally , there is a flame .. logically:d
but when i put the little barrel of my bbq igniter into the hole and press on it , i dont see a flame !!!
Image
thats my bbq igniter
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Unread postAuthor: iisthemuffin » Thu Jul 17, 2008 4:07 pm

Well if you see a flame when you click it outside of the chamber then your chamber doesnt have any oxygen.

Which is why you shouldnt have glued the cap on.
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Unread postAuthor: drunkii » Thu Jul 17, 2008 4:09 pm

iisthemuffin wrote:Well if you see a flame when you click it outside of the chamber then your chamber doesnt have any oxygen.

Which is why you shouldnt have glued the cap on.

yup , thats what i thinkt
but really ; the cap was verry strong , and it just exploded 2 times!!! not normal , i hadnt another choice .. otherways i just could trow my spudgun away,:(
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Unread postAuthor: Pilgrimman » Thu Jul 17, 2008 4:12 pm

You really should just start over, and have a look at the Spudfiles wiki.

http://www.spudfiles.com/spud_wiki/index.php?title=Main_Page
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