So this was a project that my friend and I did today.
It took us about an hour and a half to do (Not including battery charging and dinner breaks. XD)
Unfortunately, it only shoots a tennis ball about 20 feet...
Heres the upside. The cost:
-3/8 x 6' Carrbolt (x2) 0.89
-U Bolt (x2) 3.78
-Door/Gate Spring (x2) 3.98
-2" PVC Coupling (x2) 1.72
3" x 5' PVC Pipe 5.49
TOTAL+TAX= 16.73
So, that comes out to $8.37 a pop... Not bad for a good looking prop.
Heres the link:
https://www.facebook.com/album.php?aid=40485&id=100000008627629&l=5a0d535efaAll in all, mostly a fun project. This is only a proto-type. We're hoping to increase the range and velocity in other models.