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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 » Wed Mar 28, 2012 2:05 pm

I redid my electrodes hoping to be able to do with my flash Mix40:

I have not done the system of electrodes / / but I opted instead for a plug HM.
You can also see a seal that helps me when I want to unscrew the spark plug to clean it.
I tested this config up to 40bar and no worries, the spark is good.

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Unread postAuthor: killerbanjo » Thu Mar 29, 2012 11:27 am

Looks nice and clean mate, really looking forward to the finished product
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 11:46 am

Thank you!
Tomorrow I'm testing at Mix20 and Mix30!
tests will be done with the .50 caliber rifled barrel
and a smooth barrel copper in 12mm caliber (.472) and covered with iron along 100cm (3.28ft)

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Unread postAuthor: killerbanjo » Thu Mar 29, 2012 12:27 pm

Sweet :D looking forward to it
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 12:41 pm

Me too!
I did rupture disks today with cans of "1664"!

:D
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 29, 2012 12:50 pm

can you give me the exact diameter of the copper pipe? It's easier to make the sabots for a smoothbore barrel :)
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 12:58 pm

Diameter in : 12mm

But in a smooth barrel not rotating the bullet ...
Note with a sphere or an arrow that's not important ...

will support the smooth barrel Mix40?
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 29, 2012 1:04 pm

Petitlu wrote:But in a smooth barrel not rotating the bullet ...
Note with a sphere or an arrow that's not important ...


Yes, and also there's a lot less friction drag - that's why modern tanks have smoothbore barrels ;)

will support the smooth barrel Mix40?


What's the thickness of the copper?

covered with iron


What does this mean exactly - did you put it inside an iron tube?
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 1:18 pm

thickness of copper tube: 1 mm

yes I put the copper tube in an iron tube
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 29, 2012 1:18 pm

wall thickness of the iron tube?

is it an exact fit?
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 1:21 pm

thickness: 0.8mm

no space between the tubes

weakness is at the connection, the steel tube stops against the brass fitting
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 29, 2012 3:52 pm

Shouldn't be a problem.

I've done some machining in the meantime, i apologise that the workmanship is quite shoddy and rough, I don't have much free time at the moment - but it should all fit well and give you some good results :D

There's 5 8mm bearing sabots for your rifled barrel, 4 collars and pusher plates for your smoothbore barrel and 3.4mm diameter nails that should slip on without modification, and two tail sections that would require you to cut the head off the nails.
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 4:09 pm

Thank you!
I can not wait to test all these shoes!

I will remove the burrs, no problem!
you made multiple versions, it is good
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 29, 2012 4:20 pm

Petitlu wrote:Thank you!
I can not wait to test all these shoes!


No worries, will post them tomorrow :) looking forward to your results.

I'm hoping the centrifugal force on the 8mm sabots in the rifled barrel will help the sabot spread and separate.

I will remove the burrs, no problem!


Don't bother too much, they are going to be fired after all :)

Thinking about it, it's best if you cut off the heads of all the nails you use, in order to avoid the weight at the back making it tail-heavy. A bit of 5 minute epoxy to keep the nails in place should be enough.
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Unread postAuthor: Petitlu » Thu Mar 29, 2012 4:31 pm

Nails are striped so they will not go with the epoxy
:D
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