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Mega Hybrid

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Mega Hybrid

Unread postAuthor: flamintennisball » Sun Oct 15, 2006 8:29 pm

Hi all.
I'm new here as you can see, but that does not mean I'm new to spud gunning.

I am currently gathering parts for a huge hybrid and almost ready for constuction. Here are the parts I have:

2 foot long sch 80 8 inch steel pipe (chamber)
8 foot long steel pop can barrel :twisted: (seriously, pop cans fit perfectly)
8hp gas motor
1/2 inch thick steel plate
misc. pipe fittings



I plan to cut six to eight holes in the steel plate via blowtoch, so the plate can be bolted to the chamber. Pieces of angle iron will be welded to the side of the chamber for the nut to hold on. Thy reason why I don't just weld the plate to the chamber is there is no way I can get an airtight weld. with the plates as endcaps I will then proceed to the barrel. The barrel will be on a hinge for easy burst disk placement. It will have a bolt to secure it in place for firing. I will have a standard propane meter mounte on the side. With the basics done I will move on to the hard part, the motor. The motor will be for turning an old air compressor piston mounted right on the gun. I am hoping that i will be able to get up to 300 psi fuel- air mix with this setup. No more running to the air compressor for each shot.

I have one problem though, ignition
I cannot obtain a stungun where I live and want multiple sparks so a bbq ignitor won't work (i think)
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Unread postAuthor: CS » Mon Oct 16, 2006 12:27 am

What is the blowing force on your blow torch?
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Unread postAuthor: iamthewalrus » Mon Oct 16, 2006 12:28 am

who are u blowing is a better question?
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Unread postAuthor: BC Pneumatics » Mon Oct 16, 2006 12:28 am

I belive you will need one with a blow force equil to 19psi (prostitutes per square inch)
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Last edited by BC Pneumatics on Mon Oct 16, 2006 12:29 am, edited 1 time in total.
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Unread postAuthor: CS » Mon Oct 16, 2006 12:29 am

What is being 'blown' might be a even better question...
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Unread postAuthor: CS » Mon Oct 16, 2006 12:30 am

BC- But then you will need 19 PSI [Pimps per Square Inch] to equalize the force exerted.
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Unread postAuthor: SquishY » Mon Oct 16, 2006 12:32 am

Haha, If I remeber right from welding class they should all have the same pressure granted you are using the correct mixture and torch tip.If using OxyAcet and a cutting tip instead of dual use it will cut up to around 4' thick material but hell I did't pay attention to that part.
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Unread postAuthor: iamthewalrus » Mon Oct 16, 2006 12:34 am

ur mom had the right mixture with my torch head last night :)
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Unread postAuthor: BC Pneumatics » Mon Oct 16, 2006 12:34 am

I am slightly concerned that Mr. Ball cant make an air tight weld, and that Mr. SquisY is taking our posts seriously.
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Unread postAuthor: CS » Mon Oct 16, 2006 12:36 am

5 PSI Acetylene
15 PSI Oxy
You cant up the ratio? Ya you ride the damn short bus.
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Unread postAuthor: Jolly Roger » Mon Oct 16, 2006 7:08 am

Edit
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Unread postAuthor: carter » Sat Mar 10, 2007 8:41 pm

car battery and a spark plug
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Re: Mega Hybrid

Unread postAuthor: Hotwired » Sat Mar 10, 2007 8:50 pm

flamintennisball wrote:I am hoping that i will be able to get up to 300 psi fuel- air mix with this setup.

Jolly Roger wrote:uh dude do you mean you wish to take this up to a 20x mix?


What he said :shock:

A 300psi fuel-air mix, if it's not liquid is going to make a crater when you pull the trigger.
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Unread postAuthor: willarddaniels » Sat Mar 10, 2007 8:56 pm

use an ignition coil instead of a stun gun.
You can't go up to 300 psi using propane. Propane liquifies at 125 psi, for higher mix ratios, see this thread 40X mix
EDIT: even sch 80 black iron may not be enough to withstand that rate of expansion and the resulting pressure spike.
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Unread postAuthor: Insomniac » Sat Mar 10, 2007 9:53 pm

Yeah, a mix that high will DDT in a spectacular way. (meaning everyone in a 1km radius dies)
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