I am building a slingshot cannon for a demonstration for school groups. <br><br>The cannon is suppose to function as much as possible as a "real" cannon but without the explosives!<br><br>I built one using compressed air but i dont like the hose - compressor - etc.<br><br>So i have built one using a slingshot mechanism that fires 30mm cannon balls about 10 meters - which is perfect but i need a better trigger solution.<br><br>I now use an electromagnet and a steel plate on the band. So the kids put the cannon ball in barrel and push it back with a ram rod. This puts the band under tension and eventually the steel contacts the magnet which holds the band back ready to fire<br><br>Then the kids can "light" the fuse which cuts power to the electromagnet and out comes the cannon ball. <br><br>I am wondering if there is a better electronic trigger system. The steel on the band is robbing me of some of my power and also is harder on the gun because of the weight of the steel moving forward. <br><br>I have electricity - i am looking for an electric trigger system to replace my electromagnet. Ideally i can just buy the assembly - maybe it was designed for a different purpose? I can also build a trigger if i had a good design as well. <br><br>the pull strength is about 10kg<br><br>Thanks for your help!