Powerful oxyhydrogen cannon - We have a lift-off!
I have started to build a more powerful oxyhydrogen cannon, something similar like Estes Hydrogen Fuel Rocket:
The igniter of the Estes Hydrogen Fuel Rocket is simply a nichrome wire, but I want to continue to ignite the oxyhydrogen via spark. The spark generator I have used for the mosquito rover was a HV PCB from a bug zapper and it works not very reliable, so I designed a new one with a certain flash over at a spark gap of 1 mm:
The circuit is very similar to the voltage multiplier of my Geiger counter design, but without voltage regulation and with one Villard cascade more, able to produce about 2 kV (see attachment).
How to get perfect graphite electrodes by dismantling an AA alkali battery (No NiCd or Li-Ion battery!):
Keep the manganese dioxide and zinc casing, you can make interesting chemical experiments with it.
The electrolysis is monitoredby a Picaxe 08. If enough gas is generated, a short buzzer sounds and a green LED begin to flash. The ignition than is remote controlled.
Cannon functional principle and design:
Details of the "rocket":
It's not really a rocket, it's a projectile, because it has no own propulsion.
The projectile weights 52.6g.
Due to the large electrode surface, the electrolysis chamber draw 400mA at 7.2V (electrolyte: 6g acetic acid 100%./100 ml water) and produces accordingly a lot of oxygen/hydrogen more than before.
All boards are assambled now and working fine:
Programming the cannon:
Now I just have to launch the projectile...
2010.7.18 First launch passed