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SB15's hybrid

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: SpudBlaster15 » Wed Jun 20, 2007 2:09 pm

I think i will cut a gasket out of some scrap rubber. Should work, I think.
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Unread postAuthor: SpudBlaster15 » Wed Jun 20, 2007 6:51 pm

noname wrote:ball valves around here are $14 US, about $17 Canadian for a 1/4" one


My god, where do you live? Around here, 1/4" ball valves are $6 Canadian, and 1/2" ball valves (Which I used) are $8 Canadian.
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Unread postAuthor: noname » Wed Jun 20, 2007 7:39 pm

I live in the Bay Area, which is, according to my parents, one of the most expensive places in America. I can believe it. People didn't believe it when I said 1 1/2" copper pipe was $23.99 a foot, and regular 2" Sch 40 PVC is $2.25 per foot. It's ridiculous, and it sucks for me.
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Unread postAuthor: CannonBall » Sat Jun 23, 2007 7:21 pm

Please post a damage pic. so i can enjoy :lol: Nice hybrid though
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Unread postAuthor: tylerthetatertosser » Sun Jun 24, 2007 3:52 am

hey im thinking of making a hybrid but i have a question on the fueling do you put propane in the area where the pressure guage is then close that ball valve.. then add the compressed air to the same stell chamber where the pressure guage is close ball valve... and then realease into the firing chamber? :)
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Unread postAuthor: CannonBall » Sun Jun 24, 2007 4:49 am

I think he leaves his ballvalve open at the chamber..
U calculate how much fuel u need in the chamber! with the propane metering system.
And the needed air is pumped in the chamber through the metering system for better mixing. but u dont presurise the metering systeem with air with ball valves closed

Cheers :P
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Unread postAuthor: SpudBlaster15 » Sun Jun 24, 2007 4:38 pm

I think it should be quite obvious how it works. On that note,

CannonBall wrote:I think he leaves his ballvalve open at the chamber..
U calculate how much fuel u need in the chamber! with the propane metering system.
And the needed air is pumped in the chamber through the metering system for better mixing. but u dont presurise the metering systeem with air with ball valves closed

Cheers :P


You are absolutely correct.

I built this launcher using logic alone, and had no idea how other hybrid cannons work. I did realize, however, that attempting to achieve the proper fuel mixture in a 4.88 cubic inch meter would be almost impossible. Much easier in the 22 cubic inch combined volume of the meter and chamber, however.

It is best to fully understand the gas laws before attempting to build a hybrid like this. This design does not operate as a standard propane meter on a combustion gun. In a combustion launcher where no air is injected after the fuel, 1 atmosphere of fuel is left within the meter. Because my meter is larger than 18.4% (I am now using MAPP gas) of the chamber volume, I had to design it such that one atmosphere of air would remain in the meter after the shot, enabling me to measure out the correct amount of fuel.

The smaller the chamber, the more accurate the calculations need to be.
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Unread postAuthor: iPaintball » Sun Jun 24, 2007 5:32 pm

Haha noname, that sucks! I can get a 5' piece of 2" sch 40 for like 5 bucks.
As for the copper, it's not much cheaper. A 2' piece of 3/4" M type copper pipe costs 15 bucks.
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Summer Projects:
CO2 tank hybrid: Gotta fix the meter :(
Cane gun: Needs a pilot/fill setup
1.5" piston valve gun: Almost done
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Unread postAuthor: CannonBall » Mon Jun 25, 2007 1:50 pm

Any chances of damage shot.. :lol:
Im busy with my 20x mix cannon and ive got a cannon almost simular to your design but i put more gass in myne cause my chamber is 2 inches so my meter setup works for that chamber. ill hope to post the cannon later this week when i have my camera.
Also my cannon is hand held.. ill try 7x mix max.. cause my fittings are class 300 that means 2000 psi and my union should held for 2000 also :twisted:

cheers
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Unread postAuthor: SpudBlaster15 » Tue Jun 26, 2007 9:59 pm

Ok, since so many of you requested damage pictures, I finally took some today.

This is an empty oxygen cylinder. I first shot it with a 6 gram steel bolt wrapped in tape using my pneumatic launcher at 150psi. It left a dent. Then, I charged my hybrid up to a 4x mix, put the same bolt in the barrel, and fired it at the tank. It went through both sides. The dent from the pneumatic is just above the hole from the hybrid.

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Exit wound:

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Unread postAuthor: SpudBlaster15 » Wed Jun 27, 2007 8:34 pm

Well, today tylerthetatertosser and I went to the rifle range across from my house, and did the following damage to objects at 4x mixes:

- Shot a hole in a 2mm thick steel can with a 5 gram steel bolt
- Blew a 1.5" diameter hole in a piece of 3/8" plywood with a shotgun blast of airsoft BBs. (most of them shattered on impact)
- Shot a 5 gram steel bolt through a 2x6.
- Shot a 5 gram steel bolt through a 3" diameter sand bag.

I didn't have my camera at the range, so if anyone has any doubts, ask tylerthetatertosser.
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Unread postAuthor: CannonBall » Thu Jun 28, 2007 11:48 am

How much "mix" do u want to try ... my cannon will be stronger :lol:
I have a 2" chamber. So i know then how much "mix it can held "
So i sure do want to finisch my handheld hybrid.. its very simular to yours but i dont have much time for building it ... its lying around now for almost 2 months.
I only need an ignition .. im working on it :twisted:
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Unread postAuthor: SpudBlaster15 » Thu Jun 28, 2007 12:22 pm

You do not want to go above 5x. If you do, you risk DDT, which can cause even the strongest of steel chambers to rupture.

7x mix hybrid + hand held = blatant stupidity.
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Unread postAuthor: CannonBall » Sat Jun 30, 2007 8:44 am

So 5x mix hmm who has proven that ddt will ocur?
It doenst get in my my mind that it will happen... a normal motor cycle compresses gas and air way more the 5x mix..... to be precise it use a 14X mix of gasoline and air and no ddt occurs

could be me but i dont understand wy it should happen..and i know alot about Detonations..

Has is happend to anyone from the forum?
That ddt occured?
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Unread postAuthor: Fnord » Sat Jun 30, 2007 9:27 am

DDT needs a fair distance of run-up before it kicks in. In a motorcycle, there is only a small area for combustion to take place(plus the fact that the piston moves with the blast; this probably lessens the effect).

I dont think there are any reports of someone getting DDT'd at the moment. Fuzzyscorpion had his sch80 hybrid blow up, but no one knows for sure why it happend.
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