SB15's hybrid

SpudBlaster15 · Sun Jun 17, 2007 10:12 pm

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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!

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?

turbohacker · Sun Jun 17, 2007 11:37 pm

very cool!
May i suggest milk jugs as burst discs?

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?

SpudBlaster15 · Mon Jun 18, 2007 12:33 am

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noname · Mon Jun 18, 2007 9:25 am

Looks good, I see you didn't go the cheapest way on it (

, 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.

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.

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

milk jug for 3x and i have no clue for 2x..

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.

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.

SpudBlaster15 · Wed Jun 20, 2007 3:47 am

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Fnord · Wed Jun 20, 2007 6:42 am

Put a layer of neoprene behind the pop can and then put it in the union?

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.....

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..

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.