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| daberno123 |
 Posted: 03/18/2008 21:08 PM Post subject: |
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Major
Joined: 19 Nov 2007
Posts: 373
596.34 Spud Bux
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Wow, it finally clicked in my mind after a few reads and now i get it.
I vote for the sticky and the wiki
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| SpudBlaster15 |
| Posted: 03/18/2008 21:36 PM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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Thank you for answering that DYI. After reading Liki's post, I performed the famous *facepalmheaddesk* combo, then logged off, and forgot about the question.
So, does anyone want to sticky this? I will add it to the wiki right now.
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| Novacastrian |
| Posted: 03/18/2008 21:39 PM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| Yeah you get my vote for a sticky, hopefully it will help out people that are new to Hybrids. Cheers Spudblaster.
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| SpudBlaster15 |
| Posted: 03/18/2008 21:45 PM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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| Well, I am hoping that it helps everyone who has built a hybrid with a standard or air-through meter design. As I realized the other day, almost everyone on this forum has been fueling their hybrid launchers incorrectly.
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| Novacastrian |
| Posted: 03/18/2008 22:37 PM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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All i do is use X amount of fuel (roughly calculated) and then increase or decrease the amount of fuel until i acheive the loudest bang! I am sure your way is a lot more accurate though.
I have never made a fuel meter as i don't see it being worth the trouble if i can get away with using a syringe, it makes a launcher look cleaner without one too. The only advantage for me would be faster reloading times.
What i meant about helping people new to Hybrids was that if stickied they could find the info faster rather than having to look through a pile of threads.
I never realised that people had been incorrectly fueling their Hybrids though, goes to show that we learn something everyday 
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| LikimysCrotchus5 |
| Posted: 03/19/2008 0:44 AM Post subject: |
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Brigadier General
Joined: 04 Sep 2007
Posts: 976
2288.98 Spud Bux
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Well thanks DYI for answering my question, and by the way SB15, you still havent answered my other questions pertaining to the pressure that will be produced in the meter for a certain mix. Is it in bars?
And i asked that because i was making a program, as i mentioned in another thread, so that i can easily calculate this in the future, so sorry if i hurt your head by making it slam to hard, i just dont want mistakes and i didnt quite understand completely some of your variable representation. Hope it wasnt something like this.
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| SpudBlaster15 |
| Posted: 03/19/2008 2:04 AM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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Anyway, the answer to your question is yes.
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| _Fnord |
| Posted: 03/19/2008 11:04 AM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1197
1698.77 Spud Bux
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Hmm.
I just did the formula and found the optimal 6x figure is ~112 psi in my 1.8 ci meter, which is only 4 psi higher than what I've been running it at.
When I finish the second version of my hybrid, I found the optimal 1x mixture by finding the upper and lower explosive limits at 1x, making these into percentages and finding 4.2 base on those numbers(it ended up at 18 psi).
Then I just multiplied by the mix number and went from there.
Unless I did something in the equation wrong.
C volume: (somewhere around) 41 ci
M volume: 1.8 ci
Edit: Freeze frame!!
Gah... when I fired it with my mouth open I felt a concussion wave in my lungs.. weird but pretty cool.
| Description: |
look at the base of the flash compared to the end of the barrel. Oh I got a compressor for the hybrid working by the way :)
The chamber fan seems to be creating a mildly noticeable increase in noise, at least with the blank shots I've done. |
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Last edited by _Fnord on 03/19/2008 15:17 PM; edited 1 time in total |
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| SpudFarm |
| Posted: 03/19/2008 11:35 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2040
1065.13 Spud Bux
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| cool i don't get any muzzle flash from my hybrid at 5x (atleast haven't seen one)
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| DYI |
| Posted: 03/19/2008 16:52 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2214
1318.29 Spud Bux
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| Quote: | | Then I just multiplied by the mix number and went from there. |
Yep, you did something wrong. The whole point of this topic was actually to correct that problem
Anyway, it's good to see that you got a fan installed in it. That's quite an interesting muzzle flash you've got there. I imagine that it would be (relatively) small and blue if the mix was perfect, and I look forward to trying my prototype hybrid at night to find out.
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| MrCrowley |
| Posted: 03/29/2008 0:00 AM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 5949
2657.43 Spud Bux
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Forgot I made that, Twas an afternoon well spent, if you ask me
Oh and sticky it is
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| SpudFarm |
| Posted: 03/29/2008 8:57 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2040
1065.13 Spud Bux
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| good you sticked it MC
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| DYI |
| Posted: 03/29/2008 9:37 AM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2214
1318.29 Spud Bux
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| Glad to see the first post corrected. Kind of interesting that this thread was first made because SB15 though I was doing my calculations wrong, only to find out that I was actually right all along - 0.644psi/x for propane.
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| Gunner |
| Posted: 07/16/2008 4:47 AM Post subject: |
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Sergeant
Joined: 21 Oct 2007
Posts: 99
154.06 Spud Bux
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| Did I calculated right? My chamber is 0.5l and Im gonna use 4x mix so if I have 1x mix that is same as normal combustion cannon, I need 0.479l air and 0.021l propane, then 4x mix, 0.479x4=1.916 air and 0.021x4=0.084l propane?
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| SpudFarm |
| Posted: 07/16/2008 5:08 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2040
1065.13 Spud Bux
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| 4x= 3bar of air pressure and 0.18 bar with propane, run it in google to find PSI
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