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GGDT too optimistic?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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GGDT too optimistic?

Unread postAuthor: JDP12 » Tue Jun 02, 2009 9:29 pm

Hey all- I've been runnin GGDT simulations to try and simulate the paintball launcher, and am wondering if its too optimistic.

For some reason, i can't upload a picture... So here are all the stats,

Pressure 110
Outer D- 1.25
ID-0
Length-3
Barrel Seal
# of valves- 1
Flow coef-20
Seat-.78
Dead Volume-2
Piston Diam-1.25
Piston mass- 1oz
Vent Diam- .2
Pilot volume- 3
Bore-1.5
Length-7
Friction-.5psi
Mass- 2 OUNCES
Diameter-1.5
Initial position-0


It tells me i should get 99 ft/s and ~200 feet. Now this is fine for 2 ounce paintball grenades, but it seems way to optimistic for such a small chamber and low pressure...

What do you think???
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Re: GGDT too optimistic?

Unread postAuthor: jackssmirkingrevenge » Tue Jun 02, 2009 9:33 pm

ilovetoblowthingsup wrote:It tells me i should get 99 ft/s and ~200 feet. Now this is fine for 2 ounce paintball grenades, but it seems way to optimistic for such a small chamber and low pressure...


You do have a long barrel and efficient valve to compensate for this though, at what launch angle was the 200 foot range calculated?
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Unread postAuthor: JDP12 » Tue Jun 02, 2009 9:39 pm

i did the calculate max range.... it was about 44 degrees

oh that's 7 inches by the way not 7 feet...hoping that was obvious..
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 02, 2009 9:48 pm

ilovetoblowthingsup wrote:hoping that was obvious..


Not as obvious as you thought :roll: but still, if it's going at 99 feet per second and launched at around 45 degrees, why not, as long as there's a favourable wind :)
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Unread postAuthor: JDP12 » Tue Jun 02, 2009 9:48 pm

hahahaahah....

it just seems like way too good for a volume of 3.5 cubic inches.

Guess I'm just stupid....

First chamber will be out of steel... because I can't wait for PVC to dry.... then after that it will be all PVC... assuming it is successful of course
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