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ignition and mix

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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ignition and mix

Unread postAuthor: ceizz » Wed Nov 11, 2009 10:37 am

hello every body, i am french and if Mr le capitaine can come talk french to me i will feel very better.

its ok, my question for ignition is : about the spark, i read before in here it's must be 2 mm or less with piezzo BBK, what about tazer ?

about the mix what the proportion of gas butane and air, what the percent and pressure ? for the basic mix like 2x.

thank you, i go to eat with my wife and i come back

en francais : pour avoir une bonne etincelle je pense utiliser un tazer mais qu'elle espace entre les electrodes et est ce vraiment mieux qu'un piezzo ?

pour le melange des gaz entre butane et air comprimer, quel est la dose de gaz et d air et la pression, pour avoir une base par exemple un mix 2x butane air c'est quoi ?
merci, je vais manger avec ma femme et je reviens
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Unread postAuthor: ceizz » Wed Nov 11, 2009 11:38 am

what's wrong i do, nobody try to answer me !!! :(
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 12:07 pm

ceizz wrote:what's wrong i do, nobody try to answer me !!! :(


The forum is slow moving at times, la patience est une vertu! ;)

I would imagine that since the tazer spark is more energetic you can have it at a wider gap than if you were using a piezo.

As to mixes, a 2x mix would be 8% butane pressurised to 15 psi

3x - 12% butane @ 30 psi

4x - 16% butane @ 45 psi

5x - 20% butane @ 60 psi

and so on...
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Unread postAuthor: ceizz » Wed Nov 11, 2009 12:27 pm

thank you man your answer is clear like i want, i look long time on the web for this but i saw nothing.


i have one more question: about the burst disk

there is another way to make this ?
i mine like piston but i don't understand i don't know about the principle of this systeme, how its work ? i need some explanation .

ps: ''la patience est une vertu'' . In english how to write it ?
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 12:51 pm

ceizz wrote:thank you man your answer is clear like i want, i look long time on the web for this but i saw nothing.


Unfortunately if English is not your native language it may hinder your searching.

there is another way to make this ?
i mine like piston but i don't understand i don't know about the principle of this systeme, how its work ? i need some explanation.


Image

This diagram should be clear enough. The spring keeps the piston shut and the barrel sealed under the mix pressure, but when you ignite it the pressure created is too strong and it pushes the piston back, letting the gasses escape through the barrel.

''la patience est une vertu'' . In english how to write it ?


Very similar, "patience is a virtue"
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Unread postAuthor: ceizz » Wed Nov 11, 2009 1:16 pm

yes you speak allright, there is not much thing about this in french language but its ok i have you now :)

about the piston you don't think is reaLLY better than burst disk ? why i listen only about the burst disk !! lool

i thinking now how to do for measure 20% butane inside chamber ? loool
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 1:20 pm

The piston isn't really "better" than a burst disk in terms of performance, but it's easier to use because you don't have to replace the disk for every shot.

i thinking now how to do for measure 20% butane inside chamber ?


Easy ;)

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Unread postAuthor: ceizz » Wed Nov 11, 2009 1:35 pm

yes easy.... :?

the time needed to measure butane, change burst disk, the boar have time to go find girlfriend.

measure gaz like this and inject insibe chamber and pressurize the chamber ?

i see some video they do measure gaz and air with a manometer .
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Unread postAuthor: ceizz » Wed Nov 11, 2009 1:58 pm

i mine if you want the gaz reserve directly conect to the chamber, you can't do this method !
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Unread postAuthor: ceizz » Thu Nov 12, 2009 9:23 am

how to do for measure 20% butane inside chamber if my butane reserve is directly conect to the chamber ?

for example my chamber have 1 liter capacity...
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Unread postAuthor: ramses » Thu Nov 12, 2009 5:25 pm

you would use a propane meter
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Unread postAuthor: ceizz » Thu Nov 12, 2009 10:01 pm

perfect MR ramses, thanks
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Unread postAuthor: ceizz » Mon Nov 23, 2009 10:55 am

i need understand something :

when jackssmirkingrevenge say ''a 2x mix would be 8% butane pressurised to 15 psi''

is it mine 8% of the chamber volume ? :?

thanks...
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 23, 2009 11:35 am

Yes, 8% of the total chamber volume. For example if your chamber volume is 500mL, then the amount of butane you have to inject is 40mL.
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