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i really like the idea of the wood to secure the solenoid!we were using the same 9v batteries for many days. we took them to quite a few airshows where they were used all day (over 7 days) and i haven't had to change the batteries in any of them. i did notice that you are using an orbit sprinkler valve, and i have only used the rainbird valves. that's all that i can think of for the difference in run times. might be worth trying a rainbird valve if you build another? (i can't imagine they would be that different though).as for the residual charge, any kind of load should eat the voltage (such as a light bulb, but just make sure a resistor is used to drop the voltage so that the bulb won't be blown out).also, sorry i took so long to respond!
great work on this design! you and i came to a similar design and i just discovered yours. i made an instructable not too long ago after some of our old launchers got destroyed by some careless employees and i needed to make something a bit more sturdy. i used two inch tubing for everything, but now i want to go and buy some more pvc and try a smaller/cheaper design. thanks again for all the work.
no problem! i have spent a fair amount of time standing in the plumbing aisle staring at all the pieces... :)
yes, that's a great idea! i looked at them, and the price was the main reason i didn't include them in this build. all of the bike pumps we've been using have gauges built in, so we have the students use them (also the younger groups we always have an adult helping them). the sprinkler valve is the weak link for this size pipe, and it is rated for 150 psi i think.if i were to add a blow off, i would probably put it with the valve stem connection. thank you for the suggestion!
Air Powered Rocket LauncherView Instructable »