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Step 5Final Assembly, Safety and Firing
When the cement has cured for a few hour you can not attach the sprinkler valve. Be sure to use teflon on the pressurized side.
Keep tightening and make sure you stop when the solenoid is facing downward. This makes a nice little point to grab on and puts the manual bypass switch at your fingertip.
I currently use a 3' barrel. Honestly, this is too short for loaded projectiles, but it is almost too big for water bottle rockets.
SAFETY
I always pressure test my guns above what their normal operating pressure is. I tend to stay around 60psi and I tested at 90psi. I attach my air line to the filler valve and place the whole thing in a wooden box. I then slowly bring the pressure up to 90psi and I stay here for about an hour.
FIRING
I purposely leave the teflon tape off of adapter on the barrel side. This allows me to unscrew and make the whole thing easier to transport and load projectiles. I find that ketchup packets will fit if coaxed in there slowly while twisting. But, don't fire at higher pressures - otherwise the packet rips open inside the barrel and a rectangular foil wrapper shoots falls about 3 feet away.
Firing water bottle rockets: Fill a 2L (or even a smaller 20oz bottle) a third to halfway full and set it on the ground. Charge the reservoir to your firing pressure. When you are ready to fire, make sure your firing range is clear and push the barrel into the full length of the bottle.. Pick up the whole cannon/rocket and point upwards. Let everyone know you are about to fire and pull the trigger.
You will get wet -- I tend to hold it out the side a little bit.
Keep tightening and make sure you stop when the solenoid is facing downward. This makes a nice little point to grab on and puts the manual bypass switch at your fingertip.
I currently use a 3' barrel. Honestly, this is too short for loaded projectiles, but it is almost too big for water bottle rockets.
SAFETY
I always pressure test my guns above what their normal operating pressure is. I tend to stay around 60psi and I tested at 90psi. I attach my air line to the filler valve and place the whole thing in a wooden box. I then slowly bring the pressure up to 90psi and I stay here for about an hour.
FIRING
I purposely leave the teflon tape off of adapter on the barrel side. This allows me to unscrew and make the whole thing easier to transport and load projectiles. I find that ketchup packets will fit if coaxed in there slowly while twisting. But, don't fire at higher pressures - otherwise the packet rips open inside the barrel and a rectangular foil wrapper shoots falls about 3 feet away.
Firing water bottle rockets: Fill a 2L (or even a smaller 20oz bottle) a third to halfway full and set it on the ground. Charge the reservoir to your firing pressure. When you are ready to fire, make sure your firing range is clear and push the barrel into the full length of the bottle.. Pick up the whole cannon/rocket and point upwards. Let everyone know you are about to fire and pull the trigger.
You will get wet -- I tend to hold it out the side a little bit.
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