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 61 users online :: 4 registered, 0 hidden and 57 guests


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

Registered users: Bing [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 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.
Sponsored 
  • Author
    Message

hybrid EXPLOSION!

Unread postAuthor: thespeedycicada » Mon Oct 01, 2007 5:01 pm

well here is the story.After conducting at least ten 3x in my hybrid at least seven times i was totally sure it was safe at 2x and it propbaly was.Anyhow i was walking to where i was going to test fire it and i dropped it but i didn't think sch 40 would crack only pumped at 2x but i still inspected it to be sure nothing visible so i fired it...
  • 0

Attachments
P1010154.JPG
And boom!! this is all i could find of it so far its a miracle i didnt get hurt but i did se a large chunk fly off so possibly i fired it at something higher than 2x who knows.Ohh the shards are from the back of the gauge that hit my house.
P1010154.JPG (39.32 KiB) Viewed 1525 times
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: goose_man » Mon Oct 01, 2007 5:10 pm

Damn, good thing your not hurt. That would look bad for the hobby... :lol:

-goose_man
  • 0

User avatar
goose_man
Sergeant First Class
Sergeant First Class
 
Posts: 134
Joined: Sun Apr 08, 2007 6:37 am
Reputation: 0

Unread postAuthor: thespeedycicada » Mon Oct 01, 2007 5:23 pm

welll i found more shards in the bushes...
  • 0

Attachments
P1010160.JPG
shards,but i dont know what part of the gun they came from.
P1010160.JPG (20.8 KiB) Viewed 1505 times
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: BigJon » Mon Oct 01, 2007 5:31 pm

you said that it was made out of sch40 right? Would that be PVC.
if so then that is most likely your problem because i don't think it could hold those kinds of pressures.
  • 0

User avatar
BigJon
Staff Sergeant
Staff Sergeant
 
Posts: 120
Joined: Wed May 30, 2007 12:21 pm
Reputation: 0

Unread postAuthor: f.c » Mon Oct 01, 2007 5:43 pm

i bet you shat yourself when it happened. maybe it means its time to upgrade to metal ?
  • 0

User avatar
f.c
Captain
Captain
 
Posts: 340
Joined: Sun Jul 08, 2007 2:40 am
Reputation: 0

Unread postAuthor: pyromaniac » Mon Oct 01, 2007 6:09 pm

BigJon wrote:you said that it was made out of sch40 right? Would that be PVC.


Sch 40 is a wall thickness, it doesn't mean it's pvc. It could be abs, steel(i highly doubt it), pvc, or some other type of pipe.
  • 0

:pottytrain3:
User avatar
pyromaniac
Brigadier General
Brigadier General
 
Posts: 805
Joined: Tue Feb 27, 2007 7:18 pm
Location: MO
Reputation: 0

Unread postAuthor: MrCrowley » Mon Oct 01, 2007 6:16 pm

I think he knew that, we was asking 'would that be PVC?', as he may of known it could be steel, abs etc
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Sponsored

Sponsor
 


Unread postAuthor: Hotwired » Mon Oct 01, 2007 6:36 pm

Well theres an incentive to not skimp on hybrid materials :wink:


Theres quite a few pics of PVC shattering under shock loads now and a hybrid mix is fairly well up there with shock loading.
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: thespeedycicada » Mon Oct 01, 2007 6:45 pm

woot i found the barrel in the woods quite a distance away :D
  • 0

Attachments
P1010161.JPG
thats the barrel thank godness i can salvage it!
P1010161.JPG (33.18 KiB) Viewed 1468 times
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: beebs111 » Mon Oct 01, 2007 7:54 pm

what pressure were your burst discs set to burst at? just curious because a tiny crack plus a burt disk that could hold back too much presure could equal a boom.
  • 0

in the upcoming presidential election, there will be several candidates who will be running, one of whom is Hillary Clinton. Now WAIT A SECOND!!! I though there was some sort of rule that prevented someone from serving more than two terms in office. Vote Against Hillary: Presidential Elections 08
User avatar
beebs111
Brigadier General
Brigadier General
 
Posts: 807
Joined: Thu Aug 25, 2005 3:08 pm
Location: massachussets
Reputation: 0

Unread postAuthor: thespeedycicada » Mon Oct 01, 2007 8:20 pm

they usually blew at 175-180 psi.Which should be fine right?
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: Novacastrian » Mon Oct 01, 2007 9:13 pm

I use a 70psi burst disc in my Hybrid- Maybe i should use two layers?
You are one lucky guy speedy. :)
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: hi » Mon Oct 01, 2007 11:56 pm

it seems like everyone's hybrid that is made of pvc either quits working or blows up at one point or another...

maybe people shouldnt make them out of pvc, even if they are sch80.

just a thought
  • 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: noname » Tue Oct 02, 2007 12:05 am

The only PVC hybrid I use is made of a 1.5" coupler and two bushings. The whole thing is at least double layered Sch 40 and Sch 80, and the highest I EVER use it at is a 1.5x fuel mixture.
Apparently you missed my topic on PVC hybrid explosions.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: mark.f » Tue Oct 02, 2007 5:32 am

Hey now wait just a second. There are plenty of hybrids made out of PVC that haven't exploded yet. I have one working one and one "in progress", (although I quit building on it when I ran out of money), one in my closet.

And speedycicada, those white PVC fragments look awfully thin.
  • 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

Next

Return to Hybrid Cannon Discussion

Who is online

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

Reputation System ©'