Author Topic: 4" diameter projectile? (Read 2082 times)

NitroSteel · « **on:** July 15, 2009, 04:42:14 PM »

What is a good and common projectile that is 4" in diameter?

So far I've found:

30 ounce plastic Hellman's mayonaisse jar (a little loose)
*some* screw on "lids" for oxygen tanks
The disposable propane cylinders (for camping) are also a fit

I figured either of these filled with concrete would be fine. Problem is, replacement tank lids are $9.00 at the oxygen supply store, and Hellman's mayonaisse is now nearly $5.00 for a quart. I'm a little leary of cutting through the propane tanks for some reason $:-\$ .

Any other ideas?

NitroSteel

GGaskill · « **Reply #1 on:** July 15, 2009, 04:55:23 PM »

I'm a little leary of cutting through the propane tanks for some reason.

You could unscrew the valves before cutting. There will be no significant residual gas if you wait overnight.

KABAR2 · « **Reply #2 on:** July 15, 2009, 04:59:55 PM »

Quote from: NitroSteel on July 15, 2009, 04:42:14 PM

What is a good and common projectile that is 4" in diameter?

So far I've found:

30 ounce plastic Hellman's mayonaisse jar (a little loose)

and Hellman's mayonaisse is now nearly $5.00 for a quart.

NitroSteel

And after you finished 50 rounds worth of mayo you would be too fat to care about shooting cannon, also the heart may give out from all that mayo.......

Go with the propane cylinders ......Safer.... less life altering!

Ex 49'er · « **Reply #3 on:** July 15, 2009, 07:23:50 PM »

I found a 13oz. coffee can in the garage that is just a smidgen under 4". Look in hardware
stores. Maybe they make a pvc cap that big around. Good luck.

dominick · « **Reply #4 on:** July 16, 2009, 12:17:06 AM »

I've built several 4.1" barrels and a large fruit can or coffee can fits just right.

Full Scale Mountain Howitzer with 4.1" bore.

4.1" bore Sled Coehorn

Cat Whisperer · « **Reply #5 on:** July 16, 2009, 12:50:07 AM »

Fruit juice cans are a little bigger than 4" perhaps 4-1/4.

4" pvc pipe is 4.500" in diameter - and VERY consisant.

Connectors for the above are a bit bigger, cost a buck or two, but fit the standard size CW mortars.

Are there standard sizes of cardboard tubing that can be cut to length?

Rickk · « **Reply #6 on:** July 16, 2009, 12:55:27 AM »

3.5" schedule (all schedules ) or SDR (all types) PVC pipe are all 4.000 nominal diameter.

Cat Whisperer · « **Reply #7 on:** July 16, 2009, 03:01:20 AM »

SDR?

Thanks for posting this! I was not aware of anything 4" OD.

Rickk · « **Reply #8 on:** July 16, 2009, 03:23:08 AM »

You might not find 3.5 inch at Home Depot. You may have to go to a plumbing supply house.

SDR means - "SDR stands for Standard Dimension Ratio. The Standard Dimension Ratio is the outside diameter divided by the wall thickness. The lower the SDR Ratio, the thicker the wall will be. Heavy Wall SDR 26 fittings are 34.5% thicker than SDR 35 fittings. "

SDR is a different wall thickness system than "SCH (schedule)". I guess they decided they needed yet another confusing pipe system that has little connection between what it is called and what it actually measures.

subdjoe · « **Reply #9 on:** July 16, 2009, 03:26:07 AM »

Have any of the master machinists here ever considered doing a rectangular bore? We end up with all these GOEX cans...

Rickk · « **Reply #10 on:** July 16, 2009, 03:57:18 AM »

I just wandered out into the lab that I work in. One of my technicians was using a pvc pipe coupler to wind some wire around to make a coil. I had a caliper in my hand. Needless to say, I had to measure it.

It is a 3" PVC pipe coupler, and the OD measured 3.977.

Note that the outside diameter of a PVC pipe coupler may vary from one manufacturer to the next. They are mostly concerned with maintaining the ID of it, not the OD. A trip to your local hardware store with calipers in hand might be in order.

Rick

cannonmn · « **Reply #11 on:** July 16, 2009, 05:13:44 AM »

I've posted this link before but since it is easy to do and since not everyone remembers it, here it is again, sked 40 and 80 pvc pipe specs tables:

http://www.engineeringtoolbox.com/pvc-cpvc-pipes-dimensions-d_795.html

Here are the SDR dimension tables for Harvel products, so now you have lots of numbers to play with:

http://www.harvel.com/tech-specs-pvc-pipe-sdr.asp

thelionspaw · « **Reply #12 on:** July 16, 2009, 05:27:35 AM »

Yo! subdjoe. Here's your GOEX cannon. It's from the Mary Rose. Sorry for all the copy but this HP is a tird compared to my old Lexmark when it comes to editing.

cannonmn · « **Reply #13 on:** July 16, 2009, 05:55:27 AM »

Yes, the Murderer! It fired cubes.

Gonna take out my set of square cross-section drill bits and build one today!

Actually it would have some advantages as far as projectiles, you could just take appropriate square cross-section bar stock, set the length stop appropriately, and run it through the bandsaw.

Cannoneer · « **Reply #14 on:** July 16, 2009, 06:03:34 AM »

Quote from: subdjoe on July 16, 2009, 03:26:07 AM

Have any of the master machinists here ever considered doing a rectangular bore? We end up with all these GOEX cans...

Quote from: thelionspaw on July 16, 2009, 05:27:35 AM

Yo! subdjoe. Here's your GOEX cannon. It's from the Mary Rose. Sorry for all the copy but this HP is a tird compared to my old Lexmark when it comes to editing.

This 18th century rectangular bore cannon is at the St. Petersburg Artillery Museum in Russia. It was designed to fire grape shot, and supposedly disperse the shot over a larger horizontal area.

cannonmn · « **Reply #15 on:** July 16, 2009, 06:57:17 AM »

I still think I'd like to work as a night watchman in that museum-they wouldn't even have to pay me.

cannonmn · « **Reply #16 on:** July 17, 2009, 05:02:54 AM »

If you can only find PVC that is a little too large for your application, one nice thing is that it is very machinable, machines kind of like aluminum on a lathe. Only problem is that the "chip" almost never breaks! It can really get messy and in the way if you don't take care of it somehow. You can machine PVC at fairly high speeds, and the surface comes out like glass.

RocklockI · « **Reply #17 on:** July 17, 2009, 06:02:40 AM »

Boomj that rectangular bore job looks like a great project for someone !

for something kinda squarish they sure did a nice job ! nice lines , and proly real scary to face .....

gary

SHOOTALL · « **Reply #18 on:** July 17, 2009, 08:49:00 AM »

nibco sch 40 PVC-1 caps D2466 are 4 inches . You could put 2 togather with a pc. of pipe allowing the caps to touch or use a longer pc. of pipe and add weight . Can fill with concrete , diert , sand , water ,

Bornsouthern34 · « **Reply #19 on:** July 17, 2009, 05:02:47 PM »

Any fellow trying to shoot mayonaise out of his cannon must be named "Bubba" or perhaps "Nimrod"...

Victor3 · « **Reply #20 on:** July 17, 2009, 11:51:48 PM »

Quote from: Bornsouthern34 on July 17, 2009, 05:02:47 PM

Any fellow trying to shoot mayonaise out of his cannon must be named "Bubba" or perhaps "Nimrod"...

"Hold my sandwich and watch this!"

Cannoneer · « **Reply #21 on:** July 18, 2009, 12:44:20 AM »

Quote from: RocklockI on July 17, 2009, 06:02:40 AM

Boomj that rectangular bore job looks like a great project for someone !

for something kinda squarish they sure did a nice job ! nice lines , and proly real scary to face .....
gary

Gary,

I'll go along with Cannonmn's night watchman wish; I'd consider it a great vacation to have about a week, and be given free rein to wander anywhere I wished in (and outside-there are tons of bronze guns and mortars lined up in rows outdoors) this Russian museum, equiped with nothing more than a good quality digital video camera.
Here is another photo of some more experimental cannons at this museum: I'm a little lost on the intended function of these guns; I suppose these disc guns might have been intended to fire at the ground to roll, and bowl over troops and horses.

"Experimental weapons shooting disk projectiles, left to right a. Mayevskii cannon barrel, b. Plestosov and Myasoyedov cannon barrel, c. Andrianovo cannon barrel - all in the main hall of the Artillery Museum."

Victor3 · « **Reply #22 on:** July 18, 2009, 02:49:16 PM »

Looks like the picture's squished.

I like the one in the middle. I'd turn it on its side and use it as a frizbee cannon

intoodeep · « **Reply #23 on:** July 18, 2009, 03:14:03 PM »

Quote from: Victor3 on July 18, 2009, 02:49:16 PM

I like the one in the middle. I'd turn it on its side and use it as a frizbee cannon

There we go.... We can add a tennis ball cannon and we can corner the pet market too....

It's all in the name of fun... muh ha ha!!!!

Cat Whisperer · « **Reply #24 on:** July 18, 2009, 03:55:59 PM »

Oooo Ooooo Oooooo !!!!!

I just found some SQUARE heavy-duty tubing in my shop secret-stash of scrap iron!

Now to make a powder chamber and a couple of trunions for a square-shooter mortar.

To be AUTHENTIC, does the hole in the powder chamber HAVE to be square too, or can I get away with cylindrical?

Looks like 2x2 or a little less.

Double D · « **Reply #25 on:** July 18, 2009, 05:10:46 PM »

Quote from: Cat Whisperer on July 18, 2009, 03:55:59 PM

Oooo Ooooo Oooooo !!!!!

I just found some SQUARE heavy-duty tubing in my shop secret-stash of scrap iron!

Now to make a powder chamber and a couple of trunions for a square-shooter mortar.

To be AUTHENTIC, does the hole in the powder chamber HAVE to be square too, or can I get away with cylindrical?

Looks like 2x2 or a little less.

Is it seamless. you know how relentless we are about seamless....

Cannoneer · « **Reply #26 on:** July 19, 2009, 01:33:15 AM »

Quote from: Cat Whisperer on July 18, 2009, 03:55:59 PM

Oooo Ooooo Oooooo !!!!!

I just found some SQUARE heavy-duty tubing in my shop secret-stash of scrap iron!

Now to make a powder chamber and a couple of trunions for a square-shooter mortar.

To be AUTHENTIC, does the hole in the powder chamber HAVE to be square too, or can I get away with cylindrical?

Looks like 2x2 or a little less.

Cat,

Let's check out the Russian museum, it seems like they've got at least one example of every known type of artillery piece ever made by man. The museum description of this piece labels it a howitzer not a mortar, but your question about the configuration of the powder chamber has still got my interest; I wonder, if it is square shaped?

Cat Whisperer · « **Reply #27 on:** July 19, 2009, 02:06:51 AM »

BoomJ -

Great picture! Now I've got to make one that shoots some COMMONLY available objects - LIKE BRICKS!

DD -

If it's not seamless I'll put duct tape down the side to keep it together - just in case!
I think that this one will shoot blocks of wood - easy to mass produce and OK for my back yard.

Victor3 -

This one will be too small for frisbees -- maybe nacho's.

Double D · « **Reply #28 on:** July 19, 2009, 03:00:55 AM »

Quote from: Cat Whisperer on July 19, 2009, 02:06:51 AM

DD -

If it's not seamless I'll put duct tape down the side to keep it together - just in case!
I think that this one will shoot blocks of wood - easy to mass produce and OK for my back yard.

Great, I was concerned...

1Southpaw · « **Reply #29 on:** July 19, 2009, 10:38:04 AM »

Make sure it is "Gorilla Tape " Wonderfull stuff , Repaired a rip in my Semi tarp las Febuary and it is still holding fine .