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micro hybrid

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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Unread postAuthor: CasinoVanart » Sat Oct 11, 2008 8:13 pm

I wouldn't be worried about "dieseling" when adding air, i only ever used my bbq ignitor up to 9x mixes so i can not say for sure about 25x, the gap i used at 9x was around .75mm, so at 18x the gap would be .375mm, pretty hard to measure.
I would try if i were you to make a pump that would get you up to pressure with one measured stroke, no need for a guage then.

It won't be an easy task but i think it could be done wth a lot of patience, good luck Jean.
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in my pot of gold

Unread postAuthor: jean » Wed Oct 15, 2008 5:54 am

hi

yes one pump stroke per fill or 1 stroke to fill 2x, 2 stroke 4x .......

today i found in my personel"pot of gold" this brass fits!

jean
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Attachments
IMGP0295.JPG
1/8 t and left site solder fitting for pump
IMGP0295.JPG (32.46 KiB) Viewed 559 times
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pot of gold ;)
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mmmhhh.... verry small
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Unread postAuthor: Insomniac » Wed Oct 15, 2008 6:02 am

Wait a moment... If it's one stroke per BAR, then that means one stroke for 2x, and two strokes for 3x... not 4x. Remember, the chamber starts with a 1x mix, and supposing each stroke gives the 14.somthing psi needed, (or one bar), then its just number of strokes + 1 = mix.
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Unread postAuthor: jean » Wed Oct 15, 2008 6:13 am

hi
i mean per stroke 2 bar (29 psi).
pump volume double than the chamber.
i see in the chamber is no fuel bevor the first stroke! but i don´t know it is a problem

jean
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Unread postAuthor: CasinoVanart » Thu Oct 16, 2008 11:46 pm

How are you planning on fueling it jean. It sounds as though you are mixing the fuel with air before pumping the chamber to pressure with said pre-mixed fuel-air. Sounds like a good idea to me if that is the case.
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jep

Unread postAuthor: jean » Fri Oct 17, 2008 8:48 am

hi

yes
first i will use a syringe instead of a pump to test all (seal, combustion, piston work, inigtion.....)
after i will build an fuel sytem like the "firestorm omega" visualised in Theories/Accessories Database ( http://www.spudfiles.com/forums/firesto ... 14507.html ) conformed to hybrid.

1. mixing the fuel in pump
2. pump in chamber to xbar
3. inigtion

mh but i dont know how essential it is to vent the chamber after every shot!?
i hope it is not so important at 5x, 10x or 20x.....

today i change the solder fitting to pump (pump id now 20mm) and attach the barrel ( 5mm id brass tube).
its not so easy as i wish.... drill out a 1/8 plug but a little out of square
next day i will a secend try.
yesterday i order ptfe material for piston and checkvalve. i hope thats the right material to use in this place.

irgentwelche deutschen user hier die mir beim übersetzen helfen können?

jean
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Unread postAuthor: CpTn_lAw » Fri Oct 17, 2008 9:39 am

Jean, are you german, french or english?
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"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
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Unread postAuthor: jean » Fri Oct 17, 2008 11:04 am

german .. sry for bad english :oops: :cry:
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Unread postAuthor: CpTn_lAw » Fri Oct 17, 2008 1:18 pm

No probs! i'm not english either! Ich kann nur ein bischen deutsch sprechen...aber, ich glaube, daß es andere Mitglieder gebe, die sprechen deutsch!! guten abend ;)
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Unread postAuthor: rp181 » Fri Oct 17, 2008 5:23 pm

Ich kippe spreche Deutsches .....
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Unread postAuthor: CasinoVanart » Fri Oct 17, 2008 7:10 pm

I don't thinking venting will be much of a problem, you may have to adjust the fuel mixture a little bit to make it leaner after the first shot.
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Unread postAuthor: microman171 » Sat Oct 18, 2008 12:26 am

I have always wanted to make a hybrid plinker too! In NZ fittings cost MUCH MUCH more. I was thinking of using 0.8mm tubing (steel I think) from the hobby store and welding some how... Copper would be so much easier...
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