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

In total there are 72 users online :: 5 registered, 0 hidden and 67 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Hybrid Question

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.
Sponsored 
  • Author
    Message

Hybrid Question

Unread postAuthor: potatoboy00 » Wed May 23, 2007 7:42 pm

ok im making my first hybrid i know all of the ratio's and everything i just want to know can sch 40 hold a 2x mix because i live out in the boon docks and nowhere around me sell sch 80 is there any way i can strengthen the sch 40 if it will not hold a 2x mix let me know guys -Z
  • 0


potatoboy00
Private
Private
 
Posts: 9
Joined: Thu May 04, 2006 11:17 pm
Reputation: 0

Unread postAuthor: Velocity » Wed May 23, 2007 7:48 pm

I'm no hybrid master, but I think that SCH 40 would probably be able to handle a 2x mix. It certainly isn't ideal, and it certainly isn't the safest thing, but it probably would not exploded immediately. If you were to do this, make sure all of the fittings were NSF-pw or NSF-61 and insure that the pipe had an actual pressure rating. If your supplier does not provide PVC parts that meet the above requirements, you should not build a hybrid. Also, keep the hybrid small (2" and under), because those parts have a higher pressure rating than the bigger ones. Finally, I would set up some type of remote ignition system, in case it does blow.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: mark.f » Wed May 23, 2007 8:49 pm

You cannot order a 5' length of 2" SCH-80 from somewhere for chamber and barrel sleeve? That would definitely be THE BEST thing to do.

But, if you can't avoid it, 2" chamber of SCH-40 pressure rated pipe and fittings would probably hold. I'd definitely work on a remote ignition. Simply a string pulling on a BBQ igniter will work if you're far enough away.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Pete Zaria » Wed May 23, 2007 8:55 pm

Assuming every part on the chamber is NSF-PW (not just sch40) it will be fine as far as I know. I've seen guys take sch40 nsf-pw to 3x, but thats probably a bad idea. It should be fine for 2x though.

Peace,
Pete Zaria.
  • 0

User avatar
Pete Zaria
Moderator
Moderator
 
Posts: 978
Joined: Fri Mar 31, 2006 6:04 pm
Location: Near Seattle, WA
Reputation: 0

Unread postAuthor: hi » Wed May 23, 2007 9:24 pm

it will hold it, but it isnt safe and it not recomended. i think that DR used sch40 on his first hybrid, but it still isnt smart.
  • 0

"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: jimmy101 » Thu May 24, 2007 10:02 am

GasEq says 2x Propane/air will give 260 PSIG. Of course, in a real gun the spud moves (or the burst disk breaks) well before max pressure is reached. But, there is always the possibility that the round jams or you used to thick of a burst disk.

So, a 2x hybrid in sch40 pipe is probably not a good idea. Just to close to the pressure rating of the pipe. It might work OK 100 times then fail on the 101st.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: ShowNoMercy » Thu May 24, 2007 10:07 am

But at the same token, PVC is in no way intended for use in construction of cannons, of any sort. So I think we all take that risk that on the 101st charge it will fail and shower us with hot, sharp plastic shards.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jimmy101 » Thu May 24, 2007 12:13 pm

There is a big difference between running a 260 PSIG rated piece of pipe at 60 PSIG peaks (generic combustion gun peak pressure) and running the same piece of pipe routinely at 100~200 PSIG with an occasional excursion to 260 PSIG.

So no, not "at the same token", big ass difference!
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: ShowNoMercy » Thu May 24, 2007 1:52 pm

Nah not really.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: jimmy101 » Fri May 25, 2007 11:06 am

ShowNoMercy: I can't tell if you are an idiot or just being an asshole.

Currently, I leaning towards and "idiot asshole".
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: mark.f » Fri May 25, 2007 11:23 am

Gaaaagh! Let's not get into an argument. Potatoboy00 has heard enough to make his own decision. Let's just hope he uses his head and doesn't do anything unwarranted.

ShowNoMercy, your "Nah not really." response was kind of pointless, though. If you're going to argue with somebody else, at least use more than three words. :P But, really, argue over PM, not in this thread.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Return to Hybrid Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'