Stuff's Hybrid

SpudStuff · Sun Oct 29, 2006 1:01 am

1 Inch Hybrid

Chamber: 1" x 6" Sch 40 steel pipe nipple (5.82 CI)
Barrel: 1/2" x 60" Type L Copper pipe (11.78 CI)
Mix Tank: 2" x 12" Sch 40 PVC (188.5 CI)
Fuel: Propane (4.03% mix)
Mixes Attempted: 2x (so far that is)
Special Features: The second and best GEN II hybrid.

The main inspiration behind this cannon came from DR's first GEN II hybrid.

The original hybrid design was effective but way too sensitive to use happily. The problem was that with a standard hybrid a fluxuation of even 1 psi could make the mixture unignitable. This meant you needed a very accurate gauge. The gen II hybrid eliminates the need for all the complications by compressing a mixture, already at the proper propane to air ratio, with water in a separate chamber.

A picture of the first and only GEN II Hybrid

DR's cannon was a great design bur it had a major flaw: it was made of PVC. I have overcome this problem of the low pressure rating by building the entire cannon from either brass, stainless steel, or galvanized steel. I have also made some improvements to the original design. For example, the original design used 5 1/4" ball valves, i have consolidated this to 2 valves on the cannon and 2 on the propane meter. I have also built on onboard propane meter so you don’t have to use the QC. My version also includes a large gauge that records the maximum pressure achieved in the combustion.

My cannon utilizes ~$1500 of used parts all bought for ~$50 at the local flea market.

I believe the highest compression achieved by DR was 4 atmospheres. With this cannon I hope to probably hit 6-8 atmospheres.

Some more pictures:

Click to Enlarge

killagorrila99 · Sun Oct 29, 2006 1:11 am

WOH! I love it, LOVE IT! This would be the 8th nicest hybrid ever.

frankrede · Sun Oct 29, 2006 12:44 pm

Nice hybrid Spudstuff.
But I am not sure of what do you plan on shooting with it?
Its well built, but is a hybrid at that scale worth it?
But thats just me cause I like big cannons.
On the PVC part is that an air chamber with a regualator?
And for about $50 dollars you did a great job.Is it really 1500?

ProfessorAmadeus · Sun Oct 29, 2006 1:05 pm

Damn very nice! I would actually like a smaller hybrid than a large one. shoot some marbles at like 1 inch plywood.

SpudStuff · Sun Oct 29, 2006 1:42 pm

Yes the parts alone on MCmaster are the $1000 and then the stuff you cant get there is ~$500 More.

Frank: search for DR's gen II on spudtech then come back.

CpTn_lAw · Sun Oct 29, 2006 2:43 pm

what pressure can 1" galvanized sterel pipe handle?

SpudStuff · Sun Oct 29, 2006 3:18 pm

150 PSI is the rating. People say you can put 850 PSI in it but no one to my knowlage has.

saladtossser · Sun Oct 29, 2006 3:42 pm

so thats what all those stuff you bought was for, very nice, did u get to shoot it yet?
anyone think the pvc barrel will crack on firing?

SpudStuff · Sun Oct 29, 2006 4:05 pm

Dosn't anyone read the topic!?

It says

Mixes Attempted: 2x (so far that is)

Stuff's Hybrid

Sweet Eh?