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Unread 30-09-2006, 23:42
Matt H. Matt H. is offline
Long Distance Mentor
FRC #1726 (N.E.R.D.S.)
Team Role: Alumni
 
Join Date: May 2006
Rookie Year: 2007
Location: Sierra Vista, AZ
Posts: 238
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Re: Optimizing Air Cannon Range

Thank you all very much for your advice. Tonight I tested the cannon with 80PSI and shot a well rolled and rubber banded tee-shirt lubricated with talcum powder 25 yards. This is a significant improvement over last nights performance it is still lacking.

I'm not sure why the tubing would restrict our airflow. The opening from the tank to the tubing is 1/2 opening and I don't believe that can be modified with out significant structural changes to the tank itself. Since the tubing is a large diameter than this opening the tubing should not at all restrict the airflow no matter how long.

I will however look into a butterfly valve. I am slightly worried about time however because the robot must be finished before 10/20 which is our homecoming game.

Also does anyone know at a glance how fast could a butterfly valve open when actuated with a KOP pneumatic system?

Also should be make a chamber of say 5" steel piping directly attached to the valve (which is directly attached to the cannon) to improve airflow; that is definitely an option. I believe (however I am often wrong) that because our cannon is 3 1/2' long (3" diameter) a chamber of 5" diameter piping 1'4" long would allow for complete expansion into the barrel. Would this have any significant effect on our efficiency?

Thanks again, sorry for having so many questions.