Hybrid build thread

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SpudFiles Forum Index » Hybrid Cannon Discussion » Hybrid build thread

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Hybrid build thread

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Heimo

Posted: 08/31/2010 10:17 AM Post subject:

2nd Lieutenant

Joined: 25 Oct 2009
Posts: 219
363.59 Spud Bux

Dave_424 wrote:

If I was you, I would just go with a burst disk design and use the steel chamber. It should be much quicker to build and allow the higher mixes that you were looking for.

Seeing as though the aluminium is the weak part, removing it from the mix will increase your maximum pressures.

I would say that, if there were no defects/cracks in the chamber and the end plates were over engineered enough, it would withstand 50x quite easily

Dave

OK point taken the valve goes...

from this point on this will be a burst disc cannon (since my chamber allows it I will still be able to upgrade later to a valve if I feel it's necessary)

the chamber have got no cracks or defects at all

the end plates were over-over engineered, this pic proves the point

the end plates (actually its more like end plugs) are 40mm from end to end talk about overkill...

Dave_424

Posted: 08/31/2010 10:55 AM Post subject:

2nd Lieutenant

Joined: 02 Aug 2007
Posts: 220
365.45 Spud Bux

I didn't/hadn't seen the end plugs and they definatley will take the pressure

Good luck with the build

Dave

Fnord

Posted: 08/31/2010 11:19 AM Post subject:

reenigne

Joined: 13 Feb 2007
Posts: 1904
3926.49 Spud Bux

You should anneal the valve before you do anything...

Once I needed some large 1" thick aluminum plates for heat sinking purposes, and since I didn't have any I cast them myself. The first time I tried they didn't come out the way I wanted(a few air bubbles formed on the plate bottom) so I broke them up for recasting. Using a 5 lb sledge it was fairly easy to break these 1" thick plates. Cast aluminum can be very brittle.

As long as you aren't standing by it when you do the initial testing I wouldn't worry though. If you can make a copy with steel I'd recommend it for handheld use. Aluminum eventually fatigues regardless of the heat-treatment.

Heimo

Posted: 08/31/2010 11:49 AM Post subject:

2nd Lieutenant

Joined: 25 Oct 2009
Posts: 219
363.59 Spud Bux

Fnord wrote:

Aluminum eventually fatigues regardless of the heat-treatment.

yes that is correct and I did not think about that when I made that valve body, and since I would like this to be hand held, I guess I am going to go with burst disc for now and I am going to make the build the burst disc part from some 1/2 steel sheet I got

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