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PMHL by Airpress (Pressure Metered Hybrid Launcher)

Built a hybrid 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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Unread postAuthor: airpress » Sat Jun 23, 2012 10:39 am

Here a pic with 3 layers paint and 2 layers of clearcoat.
Image
Image

I've modified the 3/4" union. I've flatten one side so it can get farther into the other side of the union.
Image

For sealing I will use a O-ring. Perfect airtight.
Image

The next thing I will do is searching a way to mount the tazer in place. I will also sleeve the ignition wires in black. I've got some sleeving over from casemodding. :P
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Unread postAuthor: MrCrowley » Sat Jun 23, 2012 5:07 pm

You might find it easier to swap the union around as it is generally better to have the 'flat surface' half attached to the barrel. It will give more area for the burst disks to grip against and stop them from slipping out of the union.

That third gauge on the chamber, the one that reads 60 bar (presumably), is a waste as I'm pretty sure you wont be able to read peak chamber pressure with it. I remember DYI talking with another member (or was it you?) about it recently.
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Unread postAuthor: airpress » Sun Jun 24, 2012 5:06 am

Thx mr crowley for the tip. But do I have to swap the union? Because it works great now too. :lol:

I definitely need some ear protection. I did a 2x mix with 2 layers of cardboard. The bang is massive.(without barrel)

Vids and more pictures of building as soon I have time. :wink:
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Unread postAuthor: Labtecpower » Sun Jun 24, 2012 7:23 am

looking good there!

I definitely need some ear protection. I did a 2x mix with 2 layers of cardboard. The bang is massive.(without barrel)


watch out for your ears, things can get even louder when you up the mix :wink:
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Unread postAuthor: airpress » Sun Jun 24, 2012 8:05 am

A little video.

First i'm adding 2 times (pressure metered)propane(around 0.15bar if I remember correct) and then 1 bar of air. (2x mix)

I've mounted the barrel on and the bang is quieter.
After filling the cannon I was loosing my double quick connection. After some searching i've found it. :oops:

I definitely need to clean the gardenhouse. :)
[youtube]http://www.youtube.com/watch?v=omNsFjoOuwU[/youtube]

btw: I tested indoors because it was raining here :?
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Unread postAuthor: Petitlu » Sun Jun 24, 2012 10:34 am

cool!
you put the rupture disc that I advised you?
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Unread postAuthor: airpress » Sun Jun 24, 2012 11:23 am

Nope. I was using 2layers hard cardbord. I will use your type of disk when i go higher in mixes.
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Unread postAuthor: airpress » Sat Feb 02, 2013 5:21 am

Hmmm, i'm thinking to throw this cannon away and start from the beginning.

The only 2 things I can say:

- the chamber will be 2" steel pipe 25cm long
- high voltage ignition
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Unread postAuthor: mobile chernobyl » Sat Feb 02, 2013 1:52 pm

What ignition source do you think you will end up using?
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