CpTn's Hybrid

CpTn_lAw · Posted: 02/02/2010 9:01 AM Post subject: CpTn's Hybrid

Well well well, let's see what we've got here...
My First truely working hybrid...

SPECS
Chamber = 39 cm of 1" steel
Ignition = 350kV stungun, modded to run off my airsoft (9.6V, 3500 mAh) battery.
Valve = modded 1/2" union
Barrel(s) = .40 cal, 1/2" ; 20 mm, 24mm.

A little explanation...
I know most of the forumers don't bother reading but here is a little introduction, to say what problems I encountered, how i fixed them. First, buying the parts...
Here in france, it is pretty difficult to get access to 2" steel pipe for lambda customers. So, i sticked with 1" chamber. The union is a 1/2" one, which leads me to talk about that.
Unions
...are a PITA, excuse my english, but it's the case. At first, the "male" part of the union was not practical to make burst discs, It simply wouldn't seal. Aluminium foil would tear to pieces. I tried addind "selofane" cooking film, to seal, but it was weak.
So I sent a PM to MrCrowley who gave me very helping information about that. I sawed the "half-cone" of the male part, ground it flat. Then I cut a circle in bike tire, filed it until it was perfectly smooth, and epoxied it on the now-flat male part. (pictures to help understand) This is now a fully working union, that took for now about ten 5x shot, without any sign of failure.

The igntion
A stungun is great, makes big juicy sparks, but it eats through batteries. So after i got rid of the CR123a lithium batteries that lasted 15 test shots, I soldered the connectors from my airsoft AEG to the battery compartment of the stungun, and when I plugged to battery in, nice sparks were back!

Mixing
The mixing part is still a little blurry Very Happy

The last shot i did was 30 minutes ago in the garden, to see if I could do it again. Well...no. 5x, with soda can burst disc, it was almost as loud as my .44 black powder revolver.
I now fill the chamber to 0.2 bars for 5x shots, seems to work perfectly. It's a bit clumsy but it does the job.

RESULTS

I only have a few pictures, I'll record videos in the woods this weekend with a friend.
The wooden board is 3/4" from a desk. Strong stuff. Even at 3x it goes through. The projectiles that made this are .44 lead balls from the remington 1858, about 150 grains, saboted to fit in the 16mm barrel (only 1,5' long. ) with a little plastic cap (that weighs 0.5 gram). Carbon arrows, with the cap as sabot, I even shot a 0.2g airsoft BB against a shipping cardboard box filled with paper, about 1/2", it went through.

the rest of the pictures are

http://img38.imageshack.us/gal.php?g=cimg4631.jpg

EDIT :
6x mixes are great! Burst disc is soda can. I've shot a 40 gram steel punch at 3/4" plywood + 1/4" steel. The wood is pierced but no great scoop here, what surprised me more...is that i pierced the 1/4" steel plate. Note that the recoil is substancial with this projectile :

The video is still in edition mode, I will add it as soon as i get more footage. For now i've shot a 32" carbon arrow, several lead balls, airsoft BB's,plastic caps, BB's buckshot etc...