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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: Petitlu » Tue Apr 10, 2012 1:53 pm

I received an ignition coil Quad 250cc, I made my new ignition system!
I arcs of 20mm, I would have no problem ignition in large Mix.

I took an electrical discharge in hand, it's weird ... :shock:
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 11, 2012 12:05 am

Sweet, looking forward to more shots :)
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Unread postAuthor: Crna Legija » Wed Apr 11, 2012 1:10 am

Petitlu wrote:I received an ignition coil Quad 250cc, I made my new ignition system!
I arcs of 20mm, I would have no problem ignition in large Mix.

I took an electrical discharge in hand, it's weird ... :shock:



is it like this iv all ways thought about getting one of them.
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Unread postAuthor: Petitlu » Wed Apr 11, 2012 1:21 am

Jack me too!
But that very bad weather at home ...

I bought the coil on ebay also, the model is different but the electric arc stay the same ! :)


I have functioned with a stroboscope miniature the coil, there are good arc
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Unread postAuthor: Petitlu » Thu Apr 12, 2012 1:29 pm

Here is my final electrode that will serve me for tests and later:

Image

here is my new ignition system for tests of ThorJack.

My new box for testing, the right is located the coil and the relay, the small box contains the ignition flash.
Also a 12v battery to power the relay in the other box.
A interuptor start charging the capacitor, the other interuptor and push send 12v to actuate the relay:

Image
Image
Image

I also miniaturized the ignition that will go on Thorjack, I followed the tutorial below:

http://www.spudfiles.com/forums/viewtop ... 1c6e0372eb

Image
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 13, 2012 2:48 am

Petitlu wrote:Here is my final electrode that will serve me for tests and later


Hmmm... looks a little... flimsy.

Have you thought of using an actual automotive spark plug?

You can get miniature ones for big R/C engines, chainsaws etc, something like this, very cheaply.

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Unread postAuthor: Petitlu » Fri Apr 13, 2012 3:00 am

yes I have thought a spark plug.
But the diameter is too big and too would weaken the chamber.
Or should be a connector M1/8BSP-F14Metric but I can not find
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 13, 2012 4:30 am

Question:
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Unread postAuthor: Petitlu » Fri Apr 13, 2012 4:46 am

yes, it is 1/8BSP

the spark plug has an M14 thread - 1mm
So I need an adapter 1/8BSP Male / female M14-1mm
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Unread postAuthor: MrCrowley » Fri Apr 13, 2012 4:49 am

I think it might be 1/8" (guessing from a post made on the first page).

I think spark plugs are perfect for hybrids but there's a reason neither of my two hybrids have them: they're difficult to find in the right thread sizes.
I'm sure I could order one with 1/8" or 1/4" threads off the internet but I've struggled to find affordable NPT/BSP spark plugs online in NZ and I haven't found any in stores. I know they are out there but I got sick of looking.

I could also epoxy them in a galv. fitting but that doesn't really give me much reason to ditch my homemade electrodes.
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 13, 2012 4:59 am

Hmmm... I could be inclined to make you a custom one if I have time ;) though really, with a 1/8" nipple, bolt and some epoxy you should be able to make one that can go to 40x and beyond.
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Unread postAuthor: Petitlu » Fri Apr 13, 2012 5:14 am

nice, but not one would use when the spark plug?

I'll watch the threads of spark plug radio controlled car

EDIT :
I bought a connector or 1/8-1/4 BSP like this:
http://www.flowfitonline.com/acatalog/O ... D_174.html
With a tap of 14mm-1mm I remake the thread!
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Unread postAuthor: Petitlu » Fri Apr 13, 2012 7:22 am

I also made this electrode that looks like a spark plug

Image
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 13, 2012 7:24 am

What was the problem with this one, it looks great ;)
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Unread postAuthor: Petitlu » Fri Apr 13, 2012 7:36 am

j'avais eu un problème d'étanchéité mais maintenant c'est résolu.
Elle est un peu encombrante mais pour les tests...
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