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| Eddbot |
 Posted: 05/02/2008 0:26 AM Post subject: WOOD combustion v.2 yeah, you heard me...again |
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Captain
Joined: 09 Oct 2007
Posts: 334
374.13 Spud Bux
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ok, a while ago i made a wood combustion that, well...didn't work, it's here
anyway, on to the working one!
everything (almost) is made out of wood
the barrel is a 10" long 3/4" dowel with a 1/4" hole drilled through it
chamber is 4 slabs of 3/4" pine glued together then drilled out with a 1 3/4" forstner bit
the "clean-out adapter" is a wood circle with a weird shaped washer bolted to one side and a length of metal (found at ace near the L-brackets) on the other, when pushed in, the washer compresses and seals against the lip, then twist to lock underneath the screw brackets
ignition is a stick lighter peizo
oh, and it shoots airsoft bbs
pics:
whole gun
barrel
seal locked
seal unlocked
sealing face
handle/twist/door/thing (i have yet to come up with a proper name for this)
chamber
size comparison
damage comparison
anyway, that's about it
Last edited by Eddbot on 05/02/2008 0:33 AM; edited 1 time in total |
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| Killjoy |
| Posted: 05/02/2008 0:32 AM Post subject: |
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Brigadier General
Joined: 12 Nov 2006
Posts: 981
1637.90 Spud Bux
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| Well it looks good thats for sure haha. But the powers just a little lacking, still, looks good, nice work there. |
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| starman |
| Posted: 05/02/2008 0:43 AM Post subject: |
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Big Daddio
Joined: 12 Dec 2007
Posts: 982
1419.89 Spud Bux
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I remember your other one... This one looks a little more substantial, although the power doesn't seem to be that high. Is it too late to drop a longer barrel in there?
Still, I'm partial to working with wood...this has a sense of cool to it. I'll bet after a few shots you'll get a nice aromatic burning wood "air" about the thing. |
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| biggsauce |
| Posted: 05/02/2008 1:06 AM Post subject: |
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1st Lieutenant
Joined: 07 Jun 2007
Posts: 291
511.86 Spud Bux
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Now that really is something. A little stain or some laquer, this thing could look good on a mantle... 
How did you drill out your bore? |
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| MrCrowley |
| Posted: 05/02/2008 1:08 AM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 5793
2270.51 Spud Bux
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| Cool stuff, too bad about the power though. |
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| starman |
| Posted: 05/02/2008 1:14 AM Post subject: |
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Big Daddio
Joined: 12 Dec 2007
Posts: 982
1419.89 Spud Bux
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| biggsauce wrote: | Now that really is something. A little stain or some laquer, this thing could look good on a mantle...
How did you drill out your bore? |
Forstner bit...mentioned in his original post... |
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| biggsauce |
| Posted: 05/02/2008 1:17 AM Post subject: |
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1st Lieutenant
Joined: 07 Jun 2007
Posts: 291
511.86 Spud Bux
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| Ah, but with a hand drill? Thats a pretty steady hand to drill that good of a hole through that dowel |
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| Eddbot |
| Posted: 05/02/2008 1:51 AM Post subject: |
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Captain
Joined: 09 Oct 2007
Posts: 334
374.13 Spud Bux
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the chamber was drilled out with the forstner, the barrel was started on a drill press then finished with a hand drill, i had to go buy a 12" long 1/4" bit, but it was worth it
edit: i think i'm gonna try a heavier projectile tomorrow, it seems to me that the bb is just too light to expect alot of damage |
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| psycix |
| Posted: 05/02/2008 4:27 AM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1424
386.81 Spud Bux
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Hahah I remember the old one you made.
You surely fixed up the door on this one (no square burning mark xD)
How airtight is it? |
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| ilovetoblowthingsup |
| Posted: 05/02/2008 7:14 AM Post subject: |
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Brigadier General
Joined: 30 Mar 2007
Posts: 823
1493.64 Spud Bux
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| hmm thats really cool nice job |
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| bigbob12345 |
| Posted: 05/02/2008 8:14 AM Post subject: |
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Experienced n00b
Joined: 01 Dec 2007
Posts: 1514
362.74 Spud Bux
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Nice job
I think I might make a wood pneumatic, maybey even a piston valve out of wood 
It would probably blow up but....
Never know when this or the other one will blow up, but that just adds to the fun  |
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| bluerussetboy |
| Posted: 05/02/2008 8:17 AM Post subject: |
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1st Lieutenant
Joined: 02 Nov 2007
Posts: 269
554.77 Spud Bux
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| Nice and clean this time around. The wood is probably absorbing some of the combustion heat leading to your lack of power. If you had an old Model T coil bolted on there instead of the BBQ sparker it would look pretty cool. |
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| Ragnarok |
| Posted: 05/02/2008 8:27 AM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 1837
4467.67 Spud Bux
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| bluerussetboy wrote: | | The wood is probably absorbing some of the combustion heat leading to your lack of power. |
I think the more likely reason is the incredibly short barrel, relatively low pressures, inefficient C:B ratio, and to some extent probably fuelling issues as the chamber is small. That pellet will be way out of dodge before the pressure is up.
Over the very low time frames involved, the difference between the amount of heat PVC would absorb and the amount wood would absorb is inconsequential.
Nice work Eddbot - that's got to be one of the world's most unique spudguns. With a little cleaning up on the tape, and a bit of varnish, it could also be one of the best looking too. |
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| psycix |
| Posted: 05/02/2008 15:14 PM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1424
386.81 Spud Bux
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| bluerussetboy wrote: | | Nice and clean this time around. The wood is probably absorbing some of the combustion heat leading to your lack of power. If you had an old Model T coil bolted on there instead of the BBQ sparker it would look pretty cool. |
Why should wood absorb more heat then PVC or even metal??
As ragnarok said:
Its the short barrel ( and thus the C:B ratio) |
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| bluerussetboy |
| Posted: 05/02/2008 16:12 PM Post subject: |
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1st Lieutenant
Joined: 02 Nov 2007
Posts: 269
554.77 Spud Bux
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| It's called R-value. A material’s R-value is the measure of its resistance to heat flow. Go back to school |
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