New, better instructable:http://www.instructables.com/id/GolfballAntennaNerf-Cannon---Build-One-That-Shoo/
New, better video:http://nz.youtube.com/watch?v=pkejntZlQC0
This is my golfball gun, it features a 2" barrel sealing piston with 1.5" porting. The chamber is made from 2" Pressure Rated PVC pipe and the barrel is 1.5" PVC pipe. For more information go to:http://www.spudfiles.com/forums/viewtopic,p,100616.html#100616
Big Thanks to Nicholas Benigni, owner of SpudGunExtreme.com
You can find his website and spudgun products here:http://www.spudgunextreme.com/
Note: In the video I am wearing safety glasses you just can't see me, the shot at the end without them is perfectly safe as I was only firing air.
I also have more then enough objects as a back stop to make certain the projectile doesn't go all the way.
One shot I am firing into the open, I was shooting a golfball 380m at a golf course that was closed due to weather 50m away.
You may need to use some Lube to help the piston slide easier:http://www.amazon.com/Astroglide-Personal-Lubricant-Water-Based/dp/B000CLTYCW/ref=pd_bbs_1/103-7975610-3340617?ie=UTF8&s=hpc&qid=1189202562&sr=8-1