Thursday, April 28, 2011
This is an RC glider that was converted to rocket power with fireworks. Probably a violation of safety codes... but still very fun.
"I got a few boxes of 25 shot Saturn Missile Battery fireworks on the way home. As you can see they unpack nicely. The fuse just runs right through the bottom and you can pull them back and forth like beads on a necklace.
The fuse lights an ejection charge and this ignites a short bit of rocket propellant in the plastic missile, then there is a delay fuse and a exploding charge in the head.
The circuit is the same one I used to launch the Estes rockets, as stated above it took me a while to get it back in working order. The microchip just monitors incoming pulses and when it sees the right length pulse 3 times in a row it activates a relay connecting the rocket fuse to the main battery.
The LED's are there to show you if it got a fire signal, if the system is armed, blah blah blah
I tried a few things but in the end I just dug out a good old Estes rocket igniter and shoved it into the missile fuse, wound it with a bit of wire and dabbed some hot glue to hold it all together."
See the whole story at the RC Groups Forum.