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 65 users online :: 3 registered, 0 hidden and 62 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

valve hybrid design

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

valve hybrid design

Unread postAuthor: iknowmy3tables » Sat Nov 10, 2007 5:37 pm

I recently met a friend at school who builds spud guns he has an interesting idea for a non burst disk hybrid. It's quite simple a solenoid valve replaces the burst disk and the ignition is wired to go off simultaneously with the valve
I'm not sure about it cause I don't know if the valve will open fast enough to do any thing
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: ALIHISGREAT » Sat Nov 10, 2007 5:43 pm

burst discs are cheaper and have higher flow, also wouldn't the diaphgram get damaged?
  • 0

User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: Novacastrian » Sat Nov 10, 2007 5:52 pm

It could work with a large enough valve, however trying to time it right would be a b!tch. Also it would be very expensive, with no "real" gains.
  • 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: Fnord » Sat Nov 10, 2007 5:55 pm

The diaphragm may wear out eventually. Even if his timing is off, the valve will open on it's own, so there's nothing to worry about there.

Basically it'll work, but a metal piston valve will last longer.
  • 0

User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: MaxuS » Sat Nov 10, 2007 6:02 pm

Indeed, if they didnt go off at the same time or even if they did, the pressure would completely destroy the sprinkler valve.
  • 0

User avatar
MaxuS
Sergeant Major
Sergeant Major
 
Posts: 198
Joined: Sun Sep 02, 2007 5:11 pm
Reputation: 0

Unread postAuthor: Fnord » Sat Nov 10, 2007 6:09 pm

I don't believe the valve would be destroyed one the first shot. The first hybrid (Made by DR) used a sprinkler valve which never failed, though it was a pneumatically modded one. I don't think using an unmodded one would work the same.
  • 0

User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 7:14 pm

So does the same apply to the metal piston valve, meaning that if when you ignite the mixture, the piston valve will open by itself.
  • 0

4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
LikimysCrotchus5
Brigadier General
Brigadier General
 
Posts: 1100
Joined: Tue Sep 04, 2007 10:16 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Fnord » Sat Nov 10, 2007 7:19 pm

^Yes, and it's been proven.
That's how my hybrid works.
  • 0

User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 7:46 pm

Ahh that clears up my head now. :D I wasnt sure how it would actuate because it didnt know what force would be pushing the piston back. Also do you pressurize the chamber first so that it seals, then release the mixture? Now that i come to realize some of it, if you can make a advanced combustion and a pneumatic piston cannon, then its pretty simple to make a hybrid; you just gotta know the difference in fuel injection. Thx :D :P
  • 0

4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
LikimysCrotchus5
Brigadier General
Brigadier General
 
Posts: 1100
Joined: Tue Sep 04, 2007 10:16 pm
Reputation: 0

Unread postAuthor: iknowmy3tables » Sat Nov 10, 2007 10:24 pm

I now that the valve will open on its own with the surge of pressure even if its late.
which is likely to happen first if a parallel switch set the igniter and the valve off at the same time; the combustion or the valve opening?

if the valve is the slower one then I could put a switch on part of the solenoid so the ignition goes off when the solenoid is half way up
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: spanerman » Sun Nov 11, 2007 8:03 am

why not put a 200psi pop off valve as the ''pilot'' valve on the sprinkler?
  • 0

Image

spanerman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 438
Joined: Sun Sep 17, 2006 2:54 pm
Reputation: 0

Unread postAuthor: iknowmy3tables » Sun Nov 11, 2007 9:15 am

its been discussed it might not really do anything but a valve opening at the same time would not have to go off only at a certain pressure change
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: spanerman » Sun Nov 11, 2007 9:21 am

if i can find a suitable pop off i will be testing that with a QEV....
  • 0

Image

spanerman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 438
Joined: Sun Sep 17, 2006 2:54 pm
Reputation: 0

Unread postAuthor: iknowmy3tables » Sun Nov 11, 2007 11:34 am

so can I varying pop off valve can be found at mcmaster
but the fact that it has to obtain a certain pressure before the valve stops restricting the flow is makes it slower
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Unread postAuthor: spanerman » Sun Nov 11, 2007 12:38 pm

is it signifigant though? i cant order from mcmaster...im in the UK
  • 0

Image

spanerman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 438
Joined: Sun Sep 17, 2006 2:54 pm
Reputation: 0

Next

Return to Hybrid Cannon Discussion

Who is online

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

Reputation System ©'