Is this a good way to build cannon? prinnsipp sketch.

[oyvind]

Is this a good way to build cannon? prinnsipp sketch.












mvh

Oyvind

[GGaskill]

It would work, assuming you shrink fit the pieces together.  But you would have a joint at the highest pressure point which would collect combustion products and be a site of corrosion.  Drill from solid would be better but not always possible.

I would move the vent a little forward so that you can puncture the powder bag.  With it located where you have it, you would have to use loose powder (not recommended) for reliable ignition.

[Cannoneer]

George,

Would just shrink fitting the two parts of the barrel together be strong enough, or would the two pieces also have to be welded together where they met near mid barrel?

[GGaskill]

That much overlap would be a pretty strong joint but, on top of the static friction, pressure from firing will expand the internal tube against the external one and increase the friction between the two pieces.  Depending on how tight the fit is between the transverse faces of the two pieces, gas theoretically could get between and exert a force tending to separate the two but I do not think it would be enough to cause movement.  A weld between the two pieces would certainly resist this kind of movement and wouldn't hurt anything. 

But you do want the transverse joint to be a tight fit.

[Double D]

I don't see any good to come from it. I think corrosion will form at the joint and pressure may separate the two.  Welding might stop the separation, but I think you asking to much trying to assure the joint is tight.

[RocklockI]

must agree with DD ......if you want the parrot look ......why reinvent it .......

tracy got away with something simlar with his beast mortar , i dont think the pressures were as great .

and he used an auto gasket type sealer ......it worked .....but it got beat up too .

good luck .