Login    Register
User Information
We are a free and open
community, all are welcome.
Click here to Register
Who is online

In total there are 58 users online :: 2 registered, 0 hidden and 56 guests

Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot] based on users active over the past 5 minutes

The Team
Global Moderators
global_moderators.png CS

Hybrid Barrel Explosion

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.
  • Author

Unread postAuthor: MrCrowley » Wed Sep 29, 2010 8:36 pm

I just bought two barrels today. One 7ft long copper, 1/2 pipe, and one 5ft galvanized steel 1/2. They both have different inner diameters, for the two ammo types I will use.

Wait a sec, you're using 1/2" diameter barrels on a hybrid with a 2" union? I'd suggest building a different cannon for barrels that size and use this hybrid as a big-bore launcher.
  • 0

User avatar
Posts: 10209
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 6

Unread postAuthor: whoa044 » Wed Sep 29, 2010 9:12 pm

By two ammo types, I meant two small bore ammo types. I'm not worried about any of the larger barrels failing upon firing. I plan on using the compound rounds by UltimateSpudGun as well. My goal for those would be at least 900 fps.

inonickname wrote:You should use the yield strength, not the failure one. You also need to add in a safety factor. Finally, the seam on that pipe and the galv (galvanising is done hot, and tends to soften the metal) will drop the strength by a lot.

It's not galvanized, and it's forged steel. The company does not provide any info on the type of steel used, but I was assuming it was at least 40,000psi tensile strength.
  • 0

Posts: 79
Joined: Thu Sep 23, 2010 7:03 pm
Reputation: 0


Return to Hybrid Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot]

Reputation System ©'