I have two small pieces of 2-1/2" SCHEDULE 20 that I found, but I need
several longer pieces for a non-plumbing project. I want to make some
pneumatic beer-can launchers (for aerial shooting practice). 2-1/2"
schedule 20 is an ideal slip fit for a standard beer can.
The local Home Depot and Lowe's both say it doesn't exist until I show
them my sample, but still can't get any for me. The samples I have
are dark gray in color.
I've been looking for several years, off and on, and have never found
a plumbing store that had this stuff.
DO NOT USE PVC FOR THIS!!!
PVC has a very nasty habit of fragmenting under shock-loads.
If you must, at least wrap it with wire, so that if it does fracture,
the bits can't get into people.
HDPE is better, as it doesn't do this.
I don't know.
I do know that the pyrotechnics guys make mortars for launching
shells out of HDPE, as it fails benignly, tending to bulge or tear,
rather than fly into little shards that embed themselves in flesh.
(steel tubes are also common, as are cardboard, for one-time use)
ABS is probably _worse_ (more brittle) than PVC in this respect. There's
very little pressurized use of ABS. The only one I can think of is
Hypertek rocket motor reloads, but that's single-use, and wall thickness
starts out at thicker than sched 160, hopefully the motor stops before
it gets to sched 20 ;-) [+]
I'd prefer HDPE or schedule 40 or 80 PVC. But I don't think he can
find anything with that ID in sched 40 or 80.
[+] Fuel grain is custom-molded ABS "pipe-like-thingie" with a nozzle
on the business end. ABS because it's easy to get molded, and works
better as fuel than PVC. HDPE is even better for that...
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.
Look at how the FAA makes the pneumatic chicken cannon and the pneumatic
turkey cannons. They use them to qualify aircraft windshields. You
might find some good alternatives that are safer.
Remove SPAM From Address to Reply wrote:
The really dark grey is schedule 80 pipe. Light grey is
Check with a commercial plumbing house. If they do not carry it,
they should know who does in your area.
Might look here:
Keep the whole world singing. . . .
wrote in message
Try looking here:
Apparently, its also known as irrigation pipe:
"PVC Pipe Schedule 20 (a/k/a IPS and Thin Wall) Pipe Outside Diameters
have as of January 2001 been verified as consistent with those industry
standard dimensions also specified in ASTM D 2241 - 00. The PVC pipe
referred to in this Table is poly(vinyl chloride) PVC pipe for use in
the distribution of pressurized liquids only, and is typically used in
Hope that helps.
Grandpa Koca - SAHD for 6 - Keeper of the Perpetual Kindergarten
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