1" or 2" porting valves?

[A-98]

well, lately i have had the desire to build something a little bit more powerfull, yet still compact.

my question is , should i go with a 2" supah equivelent, and buils something like a condensed version of the SP93xx from spud tech( maybe a 2' chamber and a 3" barrel) or, should i go with 2 1" porting valves and make something along the lines of a 1/3 scale mega-launcher (GGDT-ed it and about 500 fps with a paintball).

the only thing that im worried about with the SP93 is that, joel says is "LOUD", and recommends not firing it in a city...and i live on the outskirts of a city. and im 13, and weigh ~110 lbs..and wouldnt like being nocked over by the recoil

as for the mini-mega-launcher it would be VERY small (width is 7" length [without barrel] would be 15") and i want something more impressive/big. ive considered going with a 1.5" valve and making a 1/2 scale gun, but in not sure if i can find pipe/fittings in my city that is larger than 2".

if all else fails i might toss up the money for a 2" supah-equivelent, AND 2 1 inchers! ...not that ill have any immediate use for the 2" one...

well, ive made this long enough, so ill let you comment.

[Pete Zaria]

Personally I'd go for the 2" porting Supah-knockoff over two 1" valves, unless the 1" valves were QEVs. A mini-megah with dual 1" QEVs shooting paintballs/marbles would be SWEET.

Sound is controlled by two things: chamber-to-barrel ratio (bigger is louder) and pressure (again, higher is louder).

Recoil is controlled by projectile weight. Heavier projectiles = more kick. Potatoes and golf balls aren't too bad. Concrete-filled caulk tubes hurt like a mofo. Etc...

Sounds like a fun project. Keep researching and planning and designing before you glue anything, and you're sure to get an awesome finished product. Post pics for us!

Peace,
Pete Zaria.

[A-98]

ya, i know bout the heavy=recoil...and know first hand that a short barrel will make a big noise (think 2"by 3/4" barrel with a burst disk at 100 psi..my ears are still ringing )

as for the dual QEVs, why would you want those over a 1" chamber sealing piston? i would exhaust the valves using my 3/4 sprinkler valve, so i don't think you could get much faster actuation. not sure about the flow comparisons tho. and personally i don't think QEVs look as sexy as a piston valve 8)
i plugged it into GGDT yesterday and i got a better performance with the 1" valves vs a 3/4 QEV (had to guestimate a bit on the piston valves tho), so i think ill go with those. but if you can convince me otherwise, im game.

ive already drawn up the mini-mega-launcher ( can anyone say oxymoron? ) and i plan on doing a scale drawing on some legal paper later,so i can see how big it would be.

pimpmann can make me a 2" valve for less than a supah, and then the 1"ers cant be that much, so i think ill fork up the money, and get all 3 and use them in whatever projects i may make. ill naturally make it so that the valves can be removed and used in multiple projects(my sprinkler valve is switched between 4 diff projects!) so ill get my moneys worth.

[VH_man]

Wow, I want to see this thing when youre done. if you are doing a dual barrel-sealing tee valve you will officially be my GOD

[A-98]

im using 1" porting chamber-sealing piston valves
imagine a mega-launcher that you can hold in your hands!

[schmanman]

like this, but with piston valves.

[A-98]

yup, almost exactly, but with more of a mega-launcher back, that one comes out of the valves, into a 90º and then into a T. mine will be an exact replica of the back of the mega launcher.

where did you find that? could you please link me?

[squeaks]

Okay, the only thing is that two 1" valves will not let the same flow out as one 2" valve. It's all because of the area formula for a circle(pi*r^2) If you double the radius, the area grows by four times. In that case it would require four 1" valves to get the same equivalent.

[A-98]

ya, i know.
i said it was going to be a 1/3 replica.