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Hybrid ThorJack

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: jackssmirkingrevenge » Thu Mar 15, 2012 1:23 am

POLAND_SPUD wrote:an aircylinder can solve all your problems


... even if your problem is an unsatisfied partner, if copulatingmachines.com is anything to go by :D
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 1:49 am

you're terrible! :D
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 2:17 am

Merci, je fais de mon mieux :D
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 6:28 am

I'm ready to shoot this afternoon! :D

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Unread postAuthor: pneumaticcannons » Thu Mar 15, 2012 7:52 am

damn man, you really do work fast lol.
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 9:32 am

thank !

Holy crap!

2 hours in the sun to try to get a shot at MIX10! and NOTHING!

I tested everything, Air BP before, otherwise, ignition cylinder, direct and son by anything ...

I withdraw the chamber, I look if the piezo walk and it works good I ever did three tests and still nothing ....

I imagine it is not a piezo rabbit poop!

I buy from a flash kodac, chocolate and canada dry! :D

I really balls ...

Notice the order of mixing:

When I purgeais the chamber, the smell of butane was stronger when I put this one first ...
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Unread postAuthor: POLAND_SPUD » Thu Mar 15, 2012 9:52 am

even if your problem is an unsatisfied partner, if copulatingmachines.com is anything to go by
I knew you'd mention your favourite website.
you're predictable


damn man, you really do work fast lol
yeah :shock:

When I purged the chamber, the smell of butane was stronger when I put this one first
Did you include the volume of tubing in your calculations ?
Did you purge the tubing ?

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Unread postAuthor: Petitlu » Thu Mar 15, 2012 11:01 am

yes and yes!
by cons, the flexible chamber is very narrow (flexible paintball), may be ensure mixing hurts when I put the air first, when pressure equalization ...
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 11:15 am

Oh noes... troubleshooting time.

- are you sure youre getting good spark even when it is set up (meaning there are no grounding problems)?

- is your spark gap 1mm or less? With a low energy piezo this is essential.

- are you sure the disk material you are using will burst at the pressure which the ignition will generate? I found it's very possible to have the mix ignite and the disks to remain intact if too strong.

- are you sure the chamber is 100% airtight? Even a slight leak (from the burst disk for example) can be enough to throw your mix off.
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 11:26 am

I removed the chamber and the spark was done but in my opinion not to MIX10 ...

my spacing is 1 mm

I tested the disc under 40bar! all sealed, and the manometer not drop. Whenever I have purged the chamber it was unburned gas.

I tested under 50bar chamber, it is waterproof

I think it comes from the BBQ too weak to MIX10
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 11:37 am

Petitlu wrote:my spacing is 1 mm


Can you make it smaller? I usually make it less than 0.5mm, and with a cigarette lighter piezo I can ignite up to 16-17x, so if you're getting good spark I don't think this is your problem.

Did you calculate the volumes accurately? Propane and butane have a notoriously narrow ignition range in terms of percentage concetration so the correct mix is crucial.
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 11:44 am

I can not make it smaller ...
for volumes, many with a precision manometer very accurate.
I followed your advice, 3.5% propane / butane

I still think that the problem is the ignition BBQ
I'm doing a flash ignition ...
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 11:47 am

can you try a lower mix, like 2x?
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Unread postAuthor: Petitlu » Thu Mar 15, 2012 12:00 pm

2x:
Air: 1.13 bar
bp: 0.6 bar
manometer reading: 0.6-1 :?
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 12:02 pm

Right of course.

5x?
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