| Author |
Message
|
| pat123 |
 Posted: 04/19/2008 22:15 PM Post subject: another hgdt question |
 |
|
Lieutenant Colonel
Joined: 23 Dec 2006
Posts: 475
103.26 Spud Bux
|
look at the chamber temperature is that right? over 3500 degrees fahrenheit 
and what is chamber burnout?
| Description: |
|
| Filesize: |
99.99 KB |
| Viewed: |
52 Time(s) |
|
|
|
| Back to top |
|
 |
|
|
|
| D_Hall |
| Posted: 04/19/2008 22:40 PM Post subject: |
|
|
Donating Member
Joined: 07 Feb 2008
Posts: 489
1169.17 Spud Bux
|
Yeah, propane burns hot, ya know.
Chamber burnout = The point at which all fuel/air in the chamber have burned. Note that this is NOT the same thing as all fuel/air in the entire system.... When the disc bursts, unburned fuel/air is pushed into the barrel. This fuel/air is NOT burned at the time of chamber burnout.
Now, I'll give you three guesses as to what the meaning of Bar Burnout is. 
|
|
| Back to top |
|
|
| pat123 |
| Posted: 04/19/2008 22:49 PM Post subject: |
|
|
Lieutenant Colonel
Joined: 23 Dec 2006
Posts: 475
103.26 Spud Bux
|
| can a sch 40 steel pipe handle 3500 degrees?
|
|
| Back to top |
|
|
| bigbob12345 |
| Posted: 04/19/2008 22:55 PM Post subject: |
|
|
Experienced n00b
Joined: 01 Dec 2007
Posts: 1516
370.57 Spud Bux
|
Well what does everybody use to make hybrids?
And do they have problems with the heat?
The high temp happens so shortly that even pvc chambers wont be affected at all(other than the fact it may burst from the extreme pressure generated  )
|
|
| Back to top |
|
|
| SpudFarm |
| Posted: 04/20/2008 6:33 AM Post subject: |
|
|
Hybrid Guy
Joined: 04 Nov 2006
Posts: 2048
1075.22 Spud Bux
|
steel can handle the temp..
it is in a very few ms.
|
|
| Back to top |
|
|
| VH_man |
| Posted: 04/20/2008 6:57 AM Post subject: |
|
|
Major General
Joined: 09 Dec 2006
Posts: 1341
1970.73 Spud Bux
|
| whats with the "insulation" part? my FPS increases significantly when i insulate my chamber........... wich kind of baffles me.
|
|
| Back to top |
|
|
| DYI |
| Posted: 04/20/2008 9:19 AM Post subject: |
|
|
Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
|
| Quote: | whats with the "insulation" part? my FPS increases significantly when i insulate my chamber........... wich kind of baffles me.
|
Insulation decreases heat loss, all pressure in chamber is heat, etc...
And I'll bet that the reason the burnout messages came up is because your chamber is so ridiculously oversized in comparison to your barrel. Something to do with the fact that the gases haven't fully burned until quite a while after the projectile leaves the barrel.
|
|
| Back to top |
|
|
| pat123 |
| Posted: 04/20/2008 10:14 AM Post subject: |
|
|
Lieutenant Colonel
Joined: 23 Dec 2006
Posts: 475
103.26 Spud Bux
|
| Quote: | | And I'll bet that the reason the burnout messages came up is because your chamber is so ridiculously oversized in comparison to your barrel. |
probably 28.5:1 c:b ratio
|
|
| Back to top |
|
|
| boilingleadbath |
| Posted: 04/20/2008 10:19 AM Post subject: |
|
|
Moderator
Joined: 12 Mar 2005
Posts: 1647
5491.22 Spud Bux
|
| The wall never gets very hot, because the gases don't transfer heat to the wall very fast, at least compared to the rate of heat conduction inside the wall. This holds true even in plastics.
|
|
| Back to top |
|
|
| jimmy101 |
| Posted: 04/20/2008 11:01 AM Post subject: |
|
|
Major General
Joined: 28 Mar 2007
Posts: 1600
6784.04 Spud Bux
|
Not only do the gases transfer heat relatively slowly, but more importantly, there just isn't that much energy in the gases. Doesn't really matter how hot the gases are, the mass of the gases is so small compared to the mass of the gun that the temperature rise of the gun is minimal.
Even in a closed chamber plastic has no problem handling the heat in the combustion gases. A moderate sized PVC chamber buring 1x propane in air only heats up couple degrees C. The thin layer of PVC in actual contact with the gases gets hotter, but it still isn't hot enough to affect the plastic.
|
|
| Back to top |
|
|
| ilovetoblowthingsup |
| Posted: 04/20/2008 19:12 PM Post subject: |
|
|
The Suppressor Man
Joined: 30 Mar 2007
Posts: 852
344.84 Spud Bux
|
2 things: 1) what is ignition number? number of spark gaps?
2) why is there a blue line as well? Whenever i run it i only get a red line
|
|
| Back to top |
|
|
|
|
