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My second Potato Gun

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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My second Potato Gun

Unread postAuthor: Harys » Thu Oct 20, 2011 2:15 pm

Hi everyone,
First of all, please apologize some grammatical and other errors, my English is not very good, I am from Czech Republic (small country in middle of Europe). I want show you my second Potato gun, what I made. On this gun I worked almost whole holidays of this summer and I think I succeeded quite 8).

Here are some features:
- weight: 2,3kg
- height: 170cm
- chamber volume: 4l
- barrel diameter: 5cm
- muzzle velocity: about 65m/s
- range: about 200-300m
- electronic trigger
- fan (runs on 18V)
- add laser and collimator (from old toy-gun and its mainly for effect, but functional)
- construction time: about 30hours
- price: about 800czk (its about 45usd)
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Attachments
P1070422.JPG
slightly modified photo :)
P1070423.JPG
P1070443.JPG
P1070424.JPG
if you want to shoot just pull the trigger on the pistol, there is a built-in microswitch
P1070440.JPG
on the top of the chamber you can see modified electronic lighter used as a sparker
P1070426.JPG
from the view of the shooter
P1070187.JPG
Potato Gun only few days after repainting on black design
P1070428.JPG
the fan from old Pc, runs on 18V
P1070103.JPG
before black design
P1070114.JPG
my "special" ammo from wood
P1070120.JPG
how you can see, its very powerful
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 2:29 pm

Looks pretty cool :)
I think it would have been better without the tape :wink:

how do you fuel it?
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Unread postAuthor: Harys » Thu Oct 20, 2011 2:42 pm

Labtecpower wrote:Looks pretty cool :)
I think it would have been better without the tape :wink:

how do you fuel it?


Thx, I had to used the tape on chamber, for covering a wires and other things :). And as fuel I use only Propan-Butan spray (for filling of lighter) its powerful and quite cheap, but there is problem with dosage (if its the right word :D)
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P1070425.JPG
This is what i mean..
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 3:26 pm

Hehe I use exactly the same gas :)

You can meter it using this;

Image

If your chamber is 4 liters you need 132 ml of butane.
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Unread postAuthor: mattyzip77 » Thu Oct 20, 2011 3:42 pm

Thats a pretty cool build. I think you may have used a little too much tape though, lol! I like how you incorporated the pistol onto it. Congrats! :D :D
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Re: My second Potato Gun

Unread postAuthor: jackssmirkingrevenge » Thu Oct 20, 2011 6:17 pm

Harys wrote:Czech Republic (small country in middle of Europe).


It's not only geographically inept Americans on this forum, some of us have heard of your country ;)

Nice work, is this stuff legal where you live?

As Labtec suggested, try syringe metering, check the Image ;)
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 6:24 pm

Further JSR propaganda;

[youtube]http://www.youtube.com/watch?v=0nM603eOQU4[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Thu Oct 20, 2011 6:25 pm

I didn't do it because it's linked to in the wiki entry ;)
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Unread postAuthor: jsefcik » Thu Oct 20, 2011 6:30 pm

i hope you glued it all!!!
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Unread postAuthor: Labtecpower » Thu Oct 20, 2011 6:37 pm

I didn't do it because it's linked to in the wiki entry :wink:


I spotted it.
Now he only has to do one click :D
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Re: My second Potato Gun

Unread postAuthor: Harys » Fri Oct 21, 2011 2:28 am

jackssmirkingrevenge wrote:
Harys wrote:Czech Republic (small country in middle of Europe).


It's not only geographically inept Americans on this forum, some of us have heard of your country ;)

Nice work, is this stuff legal where you live?

As Labtec suggested, try syringe metering, check the Image ;)


I don't know if it's legal in our country, but I am pretty sure, that if cops see the gun, they will confiscate it :D
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Unread postAuthor: Harys » Fri Oct 21, 2011 2:36 am

jsefcik wrote:i hope you glued it all!!!


Not only glued, there is also many screws that connect the pieces, it's very fixed :)
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Unread postAuthor: Gun Freak » Fri Oct 21, 2011 9:38 am

The screws only weaken it.

Dunno why people always do that :roll:
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Unread postAuthor: mattyzip77 » Fri Oct 21, 2011 10:44 am

Gun Freak wrote:The screws only weaken it.

Dunno why people always do that :roll:


I disagree, if you epoxy the screws when you put them in, there is no real loss of power or stability. However, I wouldnt do it on a pneumatic or a hybrid!!! :P :P
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Unread postAuthor: Gun Freak » Fri Oct 21, 2011 11:26 am

Ok it probably won't blow up but what is the use of drilling holes in the chamber and plugging them with screws? :lol:
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