Mr.Tallahassee wrote:Search the GGDT site. Depending on what model and size you have, there should be an accurate representation for the valve. I think it's under the "Archives" section.

Found it. Thanks.

Last stupid question, what would you select for valve type if using a modded sprinkler valve?

Gun Freak wrote:It is fine.....

Thanks.

Just finished my tennis ball cannon, and realized that my C:B ratio was probably way out of whack. ATM: MY 4'by 2.5" barrel has a volume of 235 CI, my 3' by 3'' chamber measures in at 254. For a combustion the best ratio is between .6 and .8, What would it be for a pneumatic? about the same?

Gun Freak wrote:What is a 2 1/2" x 2 1/2" bushing

I think he meant coupler...
Speaking of which......

Fill it with water or paint, then cover the holes with wax or something that will pop out really easy on impact. Either way you will know if it hit the target.

I do like that idea better. Anyone know the best way to melt wax? Im think a double boiler. Ill try hot glue first, oly because its ...

I was brainstorming ideas for ammo for my WIP 2.5 in cannon, and A marker tennis ball came to mind. I was thinking Take a tennis ball, puncture or cut several small holes, one large one, fill it with flour/cornstarch/etc, seal with hot glue. It would be used n MilSim airsoft. to disable tanks, and ...

I saw, that, and was very jealous. I should have some completed pictures up tomorrow, Ive got the epoxy on the SV drying, and was able to get everything but the barrel, which I bought from Spud Tech (awesome store BTW!) will be here tomorrow in the mail.

Well, a coupler between the bushing and the chamber and barrel but either way, If you want i can post a picture around Thursday.

Damn tech, what was the range while it worked?

Matty, Its going to go: SV> threaded adapter>1inch PVC>bushing>Chamber/barrel

Im going to give a plumbing contractor in my area a call tomorrow. Crossing my fingers for a 2.5inch coupler, they must have some 3inch ones as well.

You have a firing video of that beast?!

UMMMMM, the bushings you posted in the link, are they for your barrel and chamber????? If they are, please dont hit any babys, because you need slip to thread adaptors, I think!!!!

I just had a vision!!! The reason they are not fitting is because you need to use couplings!!!!! your pipe goes in ...

Firstly, your post seems impossible. My local Home Depot stocks least half a ton of pressure rated PVC pipe (red lettering on the side says something like "240psi @ 74F"). Secondly, ordering online isn't that expensive. I do it all the time, and I'm not rich.

Did you actually check the pipe ...

Currently in the middle of building a sprinkler valve based tennis ball cannon, and NO where in Maine can I find pressure rated PVC. I have been to two different Home Depots, Lowe's, small contractor stores, a plumbing store, ans a Tractor Supply. None oif the above carry any pressure rated SCH PVC ...

120 feet will be fine, probably safer for MilSim anyway.

I've run into a problem- Got my SV opened up this morning and it has a guide rod. From searching around a bit, could i possibly invert the rod (epoxy it to the bottom half), then mod as normal?