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Mini spud gun pistol, Help me choose the color

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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What color should i paint it?

Black
4
80%
Green
1
20%
 
Total votes : 5
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Mini spud gun pistol, Help me choose the color

Unread postAuthor: mikemurph » Tue May 05, 2009 10:38 pm

I've built a good number of minis, but this is one of my favorites so far. I don't really know why, but it shoots with a much greater velocity that othe guns with the same chamber size. It has a 7 mm barrel, but i have a pen tube that i can stick down it so that it can shoot airsoft bbs. Besides BBs, It shoots Q-tips, Nails, Pencils, Pens, and Blowdarts
Here's the full gun
Image
Here's a side view of the chamber/handle/ignitor
Image
And here's a look down the chamber
Image
I'm going to trick it out, I just wanted y'all to see before and after, give me some design and ammo tips
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Unread postAuthor: inonickname » Tue May 05, 2009 10:47 pm

It's alright, nothing absolutely spectacular but who cares? The funner the better eh.

As for upgrades, how about spark strip, fan and metered fuel injection? No jokes..

Black or gun metal (a shade of Grey)
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Unread postAuthor: Ragnarok » Tue May 05, 2009 11:16 pm

PINK!

Because only real men have pink guns.

@inonickname: Actually, on that note, I keep meaning to do the world's smallest advanced combustion. You see, I've found a website that sells these absolutely minuscule computer fans.
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Unread postAuthor: jook13 » Tue May 05, 2009 11:40 pm

@inonickname: Actually, on that note, I keep meaning to do the world's smallest advanced combustion. You see, I've found a website that sells these absolutely minuscule computer fans.


Where are these fans? The smallest I could find was like 26 mm on mwave.
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Unread postAuthor: Ragnarok » Tue May 05, 2009 11:56 pm

jook13 wrote:Where are these fans?

Smallest I've actually acquired so far is a 17mm fan through the company Maplin, but I've tweaked it down to just a hair over 15mm across, so I can potentially make an advanced combustion in 22mm OD (20.3mm ID) copper pipe - which is normally what I consider a barrel.

The problem is, making my micro metering system is a teensy bit fiddly (an understatement which makes calling the sun "a little hot" look mild in comparison.)
I figure I'll go with a piezo sparker - not really fancy, but HV electronics on this kind of scale is pretty infeasible given my soldering skill.
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Unread postAuthor: inonickname » Wed May 06, 2009 12:36 am

Ragnarok wrote:
jook13 wrote:Where are these fans?

Smallest I've actually acquired so far is a 17mm fan through the company Maplin, but I've tweaked it down to just a hair over 15mm across, so I can potentially make an advanced combustion in 22mm OD (20.3mm ID) copper pipe - which is normally what I consider a barrel.

The problem is, making my micro metering system is a teensy bit fiddly (an understatement which makes calling the sun "a little hot" look mild in comparison.)
I figure I'll go with a piezo sparker - not really fancy, but HV electronics on this kind of scale is pretty infeasible given my soldering skill.


Sorry mate, already done it in 1/2"- 12.5ish mm.. (though the pipe is slightly larger than that, it's still smaller than 22)

Image

Image

Yes, it has a spark strip (3 gap), metered fueling and a fan. Plus burst disk and is airtight so it could be hybridded.

Unless you want a competition..I'll go down to a 6mm chamber, any smaller and you'll have beaten me..

Still, it would have merit a plenty.

EDIT:

Here was a prototype sparkstrip (newer one is similar, but not as wide or high and made of perspex
Image

And the fan/motor I used:

Image

Custom made endcap:
Image

I'll make a new one soon...

Better stop thread hijacking, but just throwin ideas at ya man..looking good.
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Unread postAuthor: Ragnarok » Wed May 06, 2009 12:58 am

inonickname wrote:Sorry mate, already done it in 1/2"

Nice, if a little ghetto in appearance - but yours isn't fully self contained. I'm doing mine with on-board (and hopefully one touch) metering.
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Unread postAuthor: inonickname » Wed May 06, 2009 1:21 am

Ragnarok wrote:
inonickname wrote:Sorry mate, already done it in 1/2"

Nice, if a little ghetto in appearance - but yours isn't fully self contained. I'm doing mine with on-board (and hopefully one touch) metering.


Agreed- the original chamber was painted and glossed but something in the clear coat disagreed with something else, resulting in soup.

Also before getting the camera out (good one) I should have cleaned up glue webs and the such, and added the smaller switch for the fan.

I could definitely have mounted the fuel pod and a 1-2 ml syringe to it (I used a 10) but it would have over-bulked it, and I used it for other minis anyway.

Perhaps we are in need of...a contest?
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Unread postAuthor: Ragnarok » Wed May 06, 2009 1:57 am

inonickname wrote:Perhaps we are in need of...a contest?

I'm a lazy bastard that hasn't got the persistence for any kind of prolonged contest.

The mini combustion is really just something to pass the time with while I'm at university, and because it's a bit of a novelty. I've never really been overly fussed by combustions or hybrids as a concept. Sure, if I ever get the opportunity to sort the full-auto hybrid, I'll take it, but other than that...

...well, I don't really indulge in doing things which lots of other people have done before. If there's a chance to do something new and be pioneering, sure. Otherwise, I'm not really interested.

Heck, I'm half surprised I've even started to go through with HEAL 2, because to be fair, it's nothing at all new, being little more than the love-child of HEAL 1 and the Eclipse.
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Unread postAuthor: mikemurph » Wed May 06, 2009 5:07 pm

i just added an on board fueling system, and I'm working on a pump. The pics should be up tomorrow or later today
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Unread postAuthor: mikemurph » Wed May 06, 2009 6:50 pm

Here's some upgrades, Fuel injection and cooler barrel. I'm about to add a pump, or fan. Can I have some more ideas for upgrades. And how many seconds of butane should i use.
Full view:
Image
Barrel:
Image
Fuel injection:
Image
Tell me what you think :wink:
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Unread postAuthor: mikemurph » Wed May 06, 2009 9:15 pm

and after testing, it is 5 seconds of butane for a perfect BOOM :!:
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Unread postAuthor: mikemurph » Thu May 07, 2009 7:14 pm

I have decided to chose black, but i don't have any paint. I have covered it mostly in black electrical tape
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