loganater Posted January 19, 2019 Posted January 19, 2019 (edited) Just had a good test firing of my homemade sugar rocket. I know I have a lot to learn and the exhaust, but just seeing what everyone thinks. Also does anyone have tips on making a homemade electrical ignition system along with rupture disks? I know a fuse ignition is usually frowned upon, but I don't currently have anything else to ignite the motor. Any other tips would be greatly appreciated! Test #2 (1-17-2019) Success.MOV Edited January 19, 2019 by loganater
dagabu Posted January 19, 2019 Posted January 19, 2019 A few questions first: Is this a model rocket?Why a rupture disk on a sugar rocket motor? To save the rocket body? Fuse ignition is fine for pyro but not allowed on model rocketry. Use an e match from China to light them if you can do so legally, you are making rocket motors so you must? Homemade? Christmas light igniters can be found in this link. Use a momentary-on puch button switch and a 9V battery and 20m of wire to light them.
JMan Posted February 11, 2019 Posted February 11, 2019 (edited) Hey, quick reply here but Im on my phone and cant see the video. I use the christmas light igniters that dagabu gave a link for very easy and mildly reliable. As for rupture disks Ive done my own experimentation with sugar rocket sand they help tons on liftoff. I used laser cut plywood with some notches cut out at every 30 degrees so fuel could grab it and keep it in place (also was a very nice place to stick two small Christmas light wires through to attach two alagator clips. You can also cut a small circle out of aluminum cans but its hard to do electrical igniters this way cus well, no exposed wires. I doubt you got a spare laser cutter around to make plywood nozzles/burst disks but you can easily make it on a bandsaw or table saw even. Guess it wasnt such a short reply after all Edited February 11, 2019 by JMan
wingnutt Posted August 22, 2019 Posted August 22, 2019 Personally, I use 30ga nichrome wire bent in half. I dip the tip in nitrocellulose lacquer, then a quick dip in fine bp. A 3s lipo battery is more than enough juice to ignite them quickly and predictably. Have never had a misfire using this to ignite rammed powdered kno3 & sugar.
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