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Hybrid Fuel

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.
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Hybrid Fuel

Unread postAuthor: LucyInTheSky » Mon Sep 04, 2006 6:59 am

If a hybrid had a chamber of say 100ci, then you would need 16ci for a 4x mix (approx)?
So for a propane metre would you use a larger one than for a combustion or would you increase the pressure?
So you would put in a 4x the amount of propane needed in a regualer combustion then pump it up to 44.1PSI?
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Unread postAuthor: dongfang » Mon Sep 04, 2006 10:04 am

See my computations in the previous thread, and plug in your numbers.

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Unread postAuthor: noname » Mon Sep 04, 2006 11:28 am

1st question:
I have no idea.
2nd question:
Just inject the same ammount of propane 4 times.
3rd question:
Yes.

I know you don't like PVC, and that's good, especially if you plan to make a hybrid that you're going to put to 4x.
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Unread postAuthor: LucyInTheSky » Mon Sep 04, 2006 12:42 pm

Do you NEED a regulater to measur the right amount of propane?

Or can you just fit a pressure gauge in the meter then let xPSI into the meter with a ball valve?
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Unread postAuthor: SpudStuff » Mon Sep 04, 2006 1:06 pm

You Need A regulator
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Unread postAuthor: Pete Zaria » Mon Sep 04, 2006 1:13 pm

Lucy,
I use the method you just described. I have a pressure gauge in my meter pipe. I turn on the valve from the propane tank, wait for 38 PSI in the meter (the correct pressure for a 4.2% propane mix in my chamber), close the first valve, and then open the second one to vent the gas in the meter into the chamber. Works fine for me. You just have to close the first valve quickly, when the gauge reaches the correct pressure.

However, my setup is on a combustion, not a hybrid. I'm designing a steel hybrid which I intend to build early next year, though.

Peace,
Pete Zaria.
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Unread postAuthor: SpudStuff » Mon Sep 04, 2006 1:17 pm

You need an EXACT mix. a couple PSI cancause a malfunction and it won't fire.
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Unread postAuthor: LucyInTheSky » Mon Sep 04, 2006 1:19 pm

Can you use a BBQ igniter for ignition? If you made the spark gap smaller so it would still spark.
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Unread postAuthor: Shrimphead » Mon Sep 04, 2006 3:16 pm

If I were you, I would use a stun gun. The bbq sparker won't have too big of a spark under pressure (I think). You might as well pay a few dollars more and get a stun gun for a much more reliable ignition.
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Unread postAuthor: LucyInTheSky » Mon Sep 04, 2006 3:23 pm

Ok thanks.

Would this regulator work? How do you set the pressures for one?

http://www.airlines-pneumatics.co.uk/we ... de=S050138
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Unread postAuthor: LucyInTheSky » Mon Sep 04, 2006 3:28 pm

Also would it be better to have a larger meter with lower pressures or vice versa?

Like, 1x at 10psi 2x at 20psi 3x at 30psi

or 1x at 20psi 2x at 40psi 3x at 60psi?

How much pressure do propane tourches put out?

Should I can a 0-6bar reg or a 0-10bar reg?
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Unread postAuthor: noname » Mon Sep 04, 2006 6:30 pm

A smaller meter is cheaper but it doesn't really matter.
Propane in bottles is only like 90-100 psi, I'm pretty sure. I don't know bar so I can't help you there.
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Unread postAuthor: SpudStuff » Mon Sep 04, 2006 6:38 pm

Propane liquifis at 90 PSI You should use a low pressure meter with a large pipe. Get the 10 Bar Reg as then you can use it for the air as well. You ajust the Reg by turning the large knob on the top.
No Name: 1 Bar = 14.7 PSI=1 Atmosphere.
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Unread postAuthor: noname » Mon Sep 04, 2006 8:05 pm

That's easy for hybrids then. Just measure out exactly 3 bar and inject the propane.
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Unread postAuthor: SpudStuff » Mon Sep 04, 2006 9:44 pm

You mean Just inject the propane and then measure out exactly 3 bar.
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