ABS tennis ball launcher with propane

spudgunnerwryyyyy · Wed Aug 29, 2007 8:10 pm

Here is my combustion. It has a 3" ABS chamber 24" long. The chamber has 1'' female threads to accept my 2 barrels. The spark is provided by a barbecue igniter. I am very satisfied by it as the whole thing only cost me ten us dollars for I reused an old igniter. This is my first combustion so please don't flame.

EDIT: I was going to use a 16 inch 4'' chamber but was out of the required fittings for a 4" chamber.

EDIT: I added a propane meter. Much more consistent firing.

EDIT: Added pistol grip and burst disc union sch 80. Also changed meter design. Very consistent firing. I am looking for a second hand 50mm fan.

EDIT: The pvc bushing is epoxied into the abs reducer so don't freak out.

Novacastrian · Wed Aug 29, 2007 9:54 pm

In my experience with combustions i have found long chambers to be less effective than short stubby ones, something to do with the flame
front(s), this looks alright for a first attempt. What does the tape do around the back of the chamber near the cleanout cap?
Damage pics would be great. :violent3:

spudgunnerwryyyyy · Wed Aug 29, 2007 11:22 pm

Its Gorrila tape to insulate the screws from my hand

.
More comments would be nice. What should I do on design on my next gun. I mean besides fan and propane.

Novacastrian · Thu Aug 30, 2007 3:52 am

Get larger size pipe for the chamber, you can have the capacity the same, and get a nice shaped reducer

Oh yeah and a fan, just use a ball valve and syringe for metered propane

spudgunnerwryyyyy · Thu Aug 30, 2007 12:28 pm

Could you explain the syringe thing I haven't heard that method for metering propane.

edit now with propane injection.

spudgunnerwryyyyy · Sat Sep 01, 2007 6:48 pm

Added propane and burst disc for paint ball barrel. I am going to get a 20' long 1/2''barrels for double A's. Burst disc plus propane makes this way more powerful. Going to Fry's to see if they have 50mm fans for cheap.

Novacastrian · Sat Sep 01, 2007 7:09 pm

Sounds like it's coming along very nice

f.c · Sun Sep 02, 2007 6:05 am

agreed it looks nice. makes me consider fixing up an old combustion gun i was given.

spudgunnerwryyyyy · Mon Sep 03, 2007 1:51 am

Thanks guys. I updated pics and changed some designs. Worth checking out.

spudgunnerwryyyyy · Tue Sep 04, 2007 10:54 pm

I have done many tennis ball shots. I get about 11 seconds hang time. Video coming later.

shadowlanc17 · Thu Sep 06, 2007 7:49 pm

wow this gun is really cool haha good job for a first timer

spudgunnerwryyyyy · Thu Sep 06, 2007 11:10 pm

I love it, trigger is great, burst disc rocks. Tennis balls are so much fun. So loud.

mcoln1213 · Thu Oct 04, 2007 5:26 pm

that looks pretty cool

noname · Thu Oct 04, 2007 9:00 pm

Wow. Apparently, you have no idea how unsafe this gun is. You solvent welded a PVC bushing into an ABS reducer. THis gun is also handheld. Could you possibly be dumber?

Also, reducing the diameter to 1" in the middle decreases performance like hell. A burst disc is also useless in a combustion, performance wise.

BigGrib · Thu Oct 04, 2007 11:35 pm

Aside from the re engineering this needs ie noname's comment on the abs pvc no no, it looks like a good gun, i would re work the meter a little bit, she looks a wee bit cumbersome, maybe just clean her up a bit.