tank is about 20 inches long of 3" pipe
I fill usually to 100psi with a bike pump(although i have gone to 160, yeah i know, not smart[but good exercise])
barrel is 1.5 inches, and i use the cheapest potatos i can find, usually $3 for a bag of like 30 here in nyc (yeah i know shooting potatos near 2 major highways in queens nyc is once again, also not smart)
I would guess the potato goes 1000 feet if not further, while aiming for rooftop airconditioners 5 houses up my block, uphill, about 400 feet... i aim it staight, and it usually goes straight to the airconditioners,
![Twisted Evil :twisted:](./images/smilies/icon_twisted.png)
shot straight up it is hard to do, and it often lands down my block and has a hang time of like 8-10 seconds (as i remember it)
put a 1.5inch hole in my friends shed
![Twisted Evil :twisted:](./images/smilies/icon_twisted.png)
broke a glass sliding door (haha whoops)
![Evil or Very Mad :evil:](./images/smilies/icon_evil.png)
Anyway, just some things i have done.. I guestimate that i am shooting 250-300fps at the second it leaves the barrel, but i base this on no knowlege at all... maybe someone with a similar cannon can guess what i am getting
I am doing a speech on my cannon in english class, and would like to state a legitimate speed, rather than my guestimit
BTW
pictures
http://photobucket.com/albums/v611/rastetter/Potato/
replaced barrel since then (25"? X 1.5" inch) and added my own little altoids trigger with 9v battery and safety switch (nice)