bowling ball mortar or cannon

[dobber]

i just aquired a nitrogen tank that i would like to turn into a bowling ball projectile device. before i cut the bottom off and ruin a good tank, how do i tell if the inside diameter will be big enough?

[KABAR2]

what is the outside diameter?

[Cat Whisperer]

Measure the circumference.

C = pi * diameter; therefore:

C/pi = diameter  (outside diameter)

Subtract 2x the wall thickness (about 1/4 to 3/8 each wall depending on the tank).

That will give you the ID.

[GGaskill]

The max pressure rating determines the wall thickness.  Ordinary cylinders are rated at 2000 psi; they are about 1/4" thick.  There are high pressure cylinders rated at 6,000-10,000 psi with thicker walls.

[NitroSteel]

I believe it has to be an outside circumference of 29-5/8 inches to be big enough for a bowling ball mortar.  The wall thickness on all of the tanks this size (that I've cut) have been slightly thicker than 1/4", more like .30".  There could be some of this circumference that are difference, but I've cut 4 of them and they were all approximately this size.

Hope this helps.

NitroSteel

[Double D]

I beleive if you look in Tim's References post i the stiky's at the top of the frum you find the numbers you need.

[Cat Whisperer]

I believe if you look in Tim's References posted in the sticky's at the top of the forum you find the numbers you need.

I KNEW that SOMEONE posted it SOMEWHERE!   

Bore Size of commonly used items for cannon projectiles:
A bowling ball gun with proper windage would need a minimum bore of 8.815 inch.
Circumference of a bowling ball.  Max 27.002 inches.  27.002 xi .31831 = 8.595 maximum diameter of a bowling .  (8.595/39)x40= 8.815 inches http://www.topendsports.com/sport/tenpin/dimensions.htm

[Double D]

Cat Whisperer,

Tim's a brilliant guy and has posted some amazing things in his sticky...you should visit....wait you are Tim!