eureka! [TANKS]

[Christopher Clark <cjkkclark-at-comcast.net>]

I think I finally figured out how to design a multiple "rocket" 
launching system for a katyusha, nebelwerfer, panzerwerfer, etc.  Chris 
B.'s homemade canon got my mind working and I'm pretty sure I solved 
the last part of the puzzle.  Here it is: a CO2 cylinder releases air 
through a regulator into a large accumulator.  The accumulator is 
shaped much like a pipe manifold (long chamber with several nozzles 
opening out of the side).  Attached to the accumulator's nozzles are 
air hoses that run to the multiple firing tubes (3/4" PVC tubes).  What 
they actually connect to are solenoid valve/vacuum solenoids (one for 
each tube).  All of the solenoids are connected to the same circuit 
that is closed by the "firing" servo.  Until today I could not think of 
how to fire the tubes, but I through the magical world of the internet 
I learned all about solenoids, and the problem seems solved!  However, 
now the trick is to find several (5-10) such solenoids that are not too 
expensive...any ideas?  I've been doing a lot of online searching, but 
nothing has jumped out at me yet, so I figured I'd seek some 
suggestions.

Also, no one has answered my velocity question yet, so I thought I'd 
throw it back out...is there a certain fps that is required?  Does 
someone bring a chronometer, or is it like an honor system thing?

Finally, as a side note, I was so excited about the solenoid thing that 
I had to tell someone, so...I told my wife and her response simply was 
we have a baby before I get to start another project after the 
'Picacho'.  So I guess I'll try to motivate my dad or brother to take 
up this project...

Chris "do our cats count as kids?" Clark