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Part Ghetto First Combustion 75mm Mortar

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Part Ghetto First Combustion 75mm Mortar

Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 9:51 am

Well this is my very first combustion in all my experience with Spudguns, it took a bit over an hour to complete and just seems quite ghetto with all the tape and whatnot. It will definately be my last combustion.
The bore is actually closer to 68mm than 75mm.

The shots were in order of Crap - Best.


[youtube]http://www.youtube.com/watch?v=Nfh7mNwuiuk[/youtube]
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Unread postAuthor: potatoflinger » Thu Mar 27, 2008 10:20 am

That isn't a bad looking gun, but as you said the performance wasn't too great, although the shots were getting progressively better, so I guess you were getting better at measuring the fuel.

Unless you go all out and build an advanced combustion, the performance of a combustion gun won't really be too amazing.
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Unread postAuthor: Tom » Thu Mar 27, 2008 10:56 am

It doesn't look that bad :D . I don't now if it's possible but when you don't have a bigger chamber the barrel I would use a powerful fuel like hydrogen :twisted: . I'm not sure the PVC will hold that amount of pressure :!:
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Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 11:21 am

Lol, well thanks guys..It's probably going to rot in my shed now. :D

I'm a pneumatic man, I like them far more than combustions mostly due to the reliability.
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Unread postAuthor: Carlman » Thu Mar 27, 2008 12:04 pm

what is your ammo for that thing?

and also a simple propane meter would work wonders for this thing :D
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Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 12:10 pm

I'm using very loosely fitting tennis balls and whatever else I can shove down the barrel. This cost almost nothing to make, the end plug is custom made from a piece of wood and bolted into the end. I'm using a schrader for supplying new air to the chamber.

I can't be arsed to make a propane meter for this beast, all efforts are going into my rather huge spud gun instead (it's yet another pneumatic).
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Unread postAuthor: Carlman » Thu Mar 27, 2008 12:12 pm

mmmmmmm k, i still love it though :D
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Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 12:13 pm

Lol, doesn't even produce a muzzle flash. :(
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Unread postAuthor: Carlman » Thu Mar 27, 2008 12:28 pm

what is the ratio you using?, spose you could control and change that by moving the position of the stop...
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Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 1:46 pm

C:B Ratio was about 0.5:1. Yeah, I thought about moving the stop.

I did a dry fire earlier and it sure does require ear protection when standing right next to it.
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Unread postAuthor: Tom » Thu Mar 27, 2008 2:07 pm

What is the maximum pressure of the PVC your using?
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Unread postAuthor: MaxuS the 2nd » Thu Mar 27, 2008 3:21 pm

It is rated for 10 bar (147.5psi). I'm doubtful it will fracture under such low pressures.
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