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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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SB15's hybrid

Unread postAuthor: SpudBlaster15 » Sun Jun 17, 2007 10:12 pm

This is my smallish hybrid, constructed entirely using steel, brass, and copper. The combustion chamber has a volume of ~13 cubic inches, and a barrel that measures 48" x 0.545". The barrel is way too short, and I plan to replace it with an 8ft barrel as soon as I acquire the funds. It has a remote ignition setup that utilizes a spare transmitter, receiver, battery, and servo from one of my R/C vehicles. I originally used chip bag burst disks, but I had to use 4 layers to use a 4x mix, so I switched to milk jug burst disks, which do not burst cleanly, but work well none the less.

Specs:

Chamber: 1 1/4" x 9" (steel pipe nipple)
Barrel: 0.545" x 48" (1/2" type L copper)
Spark: Homemade spark plug with 1/8" NPT threads.
Ignition: Remote ignition setup with 1/4 mile range.
Fuel: Mapp gas
Mixes used: 4x, 5x

Image

Image

Ignition activated:

Image
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Last edited by SpudBlaster15 on Thu Jun 28, 2007 2:09 am, edited 1 time in total.
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Unread postAuthor: Velocity » Sun Jun 17, 2007 10:51 pm

Nice hybrid you got there! I am sure that every spudder looks forward to the day when he/she finally builds a hybrid and submits it... well, your time is now!

Have you had any problems fueling and firing it? I know that the people who didn't use generation II fueling systems had problems achieving ignitable mixes.

Do you have any good damage pictures? I am sure that it is very powerful.

I'm sure you already know this, but you could definitely slap on a much longer barrel on this beast. Right now, your chamber to barrel ratio is just over 1:1.

Again, great job on this one!
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Unread postAuthor: spud-tom » Sun Jun 17, 2007 11:15 pm

damn, thats awesome. by the way, how did you manage to use chip bag pieces as your burst discs?
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Unread postAuthor: turbohacker » Sun Jun 17, 2007 11:37 pm

very cool!
May i suggest milk jugs as burst discs?
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Unread postAuthor: experament-u2 » Mon Jun 18, 2007 12:23 am

very nice i like the ignition setup alot, just one q tho what is the big red squishy thing? is it a button?
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Unread postAuthor: SpudBlaster15 » Mon Jun 18, 2007 12:33 am

Rmich:

I initially had numerous problems getting it to fire, due to the fact that my meter design prevented the incoming air from effectively mixing with the fuel. I redesigned it, and the result is what you see in the pictures. The incoming air is now forced to evacuate the propane charge from the meter and mix with it, meaning I achieve ignition every time, with 10psi in the meter, and 45psi in the chamber (ok, so I have only fired it twice).

Here is a picture of my original configuration. I was concerned that I would in fact have issues involving proper mixing, and you can probably see why based on the location of my air filling and propane filling ports.

Image

I originally intended to use a 10 foot barrel, and I will probably extend the current one to this length in the future.

Tomorrow I will snag a picture of the cement block I demolished with a steel bolt.

Spud-tom: I simply cut a chip bag into several small disks that fit into my union.

Turbohacker: Thanks for the suggestion, I will try milk jug burst disks tomorrow.

experiment-u2: The big red thing is the button that activates my electric grill igniter.
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Unread postAuthor: noname » Mon Jun 18, 2007 9:25 am

Looks good, I see you didn't go the cheapest way on it ( :D , ball valves around here are $14 US, about $17 Canadian for a 1/4" one).
The remote ignition looks like more than I could get to work, I think I'll just keep my 6" long BBQ igniter wires. :lol:

Oh, I almost forgot! The reason my hybrid hasn't been working is that I was injecting propane 4 times and then adding the 5x air mix (~60 psi). Unfortunately, I took the meter and stuff off the mixing tank, so now I have to go find it in my jungle of a workshop.
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Unread postAuthor: spudthug » Mon Jun 18, 2007 10:21 am

nice hybrid sb15!! i like it.. for 4x mixes use pop can burst discs for alot more bang :twisted: milk jug for 3x and i have no clue for 2x..
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Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: Killjoy » Tue Jun 19, 2007 12:08 am

It sure is nice to see more hybrids around here, i really like the remote ignition too. Its so simple and clever, very nice.
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Unread postAuthor: hi » Tue Jun 19, 2007 11:53 pm

I initially had numerous problems getting it to fire, due to the fact that my meter design prevented the incoming air from effectively mixing with the fuel


thats exactly how mine works.

nice gun you got there, i like the fact it kinda looks like under the sink in my house, just kidding.

very nice hybrid.
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Unread postAuthor: SpudBlaster15 » Wed Jun 20, 2007 3:47 am

Thanks guys.

Does anyone have advice on getting pop can burst disks to seal? Today I fired it a bunch of times using milk jug burst disks, but although they seal well, they seem to be bursting quite early. I tried using a piece from a pop can, but it leaked about 2psi per second at a 4x mix. I tried coating the disk in pipe thread sealant, and it still leaked, so I began to wonder if the disk was at fault. I pressurized it with the on board Mapp tank, and held a lighter to all threaded connections. Upon reaching the union, a massive fireball erupted, and engulfed the whole union in flame. I was thinking about coating the disks in silicone sealant, and allowing it to cure before placing them in the union.
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Unread postAuthor: Fnord » Wed Jun 20, 2007 6:42 am

Put a layer of neoprene behind the pop can and then put it in the union?
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Unread postAuthor: lukemc » Wed Jun 20, 2007 8:13 am

rmich732 wrote:Have you had any problems fueling and firing it? I know that the people who didn't use generation II fueling systems had problems achieving ignitable mixes.


what is a generation II fueling system? i ask this because i was just realizing last night that i can make a hybrid for under 10 dollars because of all the stuff my dad has. except the fire extingusher.....
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Unread postAuthor: spudthug » Wed Jun 20, 2007 8:49 am

Does anyone have advice on getting pop can burst disks to seal? Today I fired it a bunch of times using milk jug burst disks, but although they seal well, they seem to be bursting quite early. I tried using a piece from a pop can, but it leaked about 2psi per second at a 4x mix. I tried coating the disk in pipe thread sealant, and it still leaked, so I began to wonder if the disk was at fault. I pressurized it with the on board Mapp tank, and held a lighter to all threaded connections. Upon reaching the union, a massive fireball erupted, and engulfed the whole union in flame. I was thinking about coating the disks in silicone sealant, and allowing it to cure before placing them in the union.


did u put a rubber gasket in the union? if u didnt i am surprised u got it to hold any pressure..if u did put a gasket in the union then u could try tightening it a little more with a pipe wrench. i always give mine a little twist with a pipe wrench just for no leaks..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: noname » Wed Jun 20, 2007 9:53 am

Yeah, if you want a perfect seal in a union you need to something for the disc to seal against. In all PVC unions, there is a small O-ring on one of the flanges. You need to get a small rubber gasket for yours. I found my gaskets in the same aisle as the steel fittings, in a row above the shelves next to the Teflon tape.
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