First hybrid build

[Scrambles622467]

This is what I have so far, it's all 2 inch galv steel pipe. The 2 long pieces on the sides are the chamber wich is 226 cubic inches not including all the misc atachments. Now I just have to get the piston made for the piston valve and the ignition set up. Does any body have any advice on an ignition system? I've looked at spark strips and spark plugs but I am not sure which would work best.

[jackssmirkingrevenge]

Holy reducers batman!

A spark strip with multiple ignition points is technically more efficient than a single spark plug but you should be OK with the latter really, with all that volume even at low mixes you'll be obliterating pretty much anything you put in front of the barrel...

[Scrambles622467]

I'm thinking about putting a spark strip in each chamber, I just haven't figured out how to cone t the wires and still have it be air tight. Any ideas? I looked into that universal spark strip but my only concern is weather the curent will pass through the bolts or just electrify the whole damn and shock me, I have a 1.9 million volt stun gun to put to use.

[PeteS]

I have had good luck using auto or motorcycle spark plugs. I use ones with a 10mmx1.0 thread and bought a tap for that size. autotoolworld.com has a decent price on the tap.

[noname]

Electrifying the entire cannon isn't the most efficient circuit, but it won't zap you if that's what you're worried about. Even if you are holding it bare handed, the circuit would rather run through the conductive metal than your flesh.
You don't have to worry about holding the circuit bare handed, you'll only get zapped if you complete the circuit.

[Scrambles622467]

My other question is what is the best way to preasure test this thing, my idea was to take one of each part that's in my gun connect them all together then, pump it full of hydronic fluid till it breaks. How do you guys do it?

[jackssmirkingrevenge]

How do you guys do it?

Most people don't, if you have used correctly rated fittings and put them together correctly it's not really necessary.

What mix number are you planning to take it to?

[Scrambles622467]

I plan on taking it to 15 maybe 20x but I think it be a very good idea of preasure testing before those levels.

[jackssmirkingrevenge]

What is your lowest rated fitting?

[Scrambles622467]

Well according to engineer toolbox I don't have a damn thing to worry about, if I keep it under 4000 psi.

[jackssmirkingrevenge]

In that case you should be fine up to 20x mixes frankly even at 10x you'll be thinking the whole thing is a bit overkill.

One thing I would be careful about is allowing it to recoil freely, otherwise it will put stress on where the barrel tee meets the chamber.

[PeteS]

How long of a barrel do you plan to use? It looks like it has enough chamber volume for an extremely long barrel. Especially at those mixes, unless you are going VERY long it looks to my not so expert eye as if it would perform just as well with a much smaller chamber. Have you tried playing with the numbers with the Hybrid Gun Design Tool?

[Scrambles622467]

I didn't even know there was such a thing haha. I plan on using 3 different bArells depending on how far I'm trying to shoot I'm thinking 5 a 10 and a15 foot barrel, I am extremely curious to see how far one of these things will throw a potato cuz the last combustion I built could hit 1400 feet regularly.

[jackssmirkingrevenge]

I am extremely curious to see how far one of these things will throw a potato cuz the last combustion I built could hit 1400 feet regularly.

I'm afraid you will be disappointed, even at low mixes the potato will exit the barrel as a cloud of fragmented starch. I heard there was a crazy Kiwi who has been using frozen lemons...

[Scrambles622467]

Not if they are cut and frozen with liquid nitrogen....... Then they will be indestructable!!!!