I use a stun gun for ignition instead of a piezoelectric ignitor, guarantees a hot spark and facilitates separation of the launcher from the operator adding safety.
I'm able to launch plastic bottles over 100 metres with this device.
launch procedure is
spray fuel in bottle
place bottle on launch tube
created painfully with instructables for android
Step 1: Materials Needed
the basic idea is:
2, 2 inch lengths for the inside "H" supports
4, 8 inch lengths for the outside "H" supports
1, 16 inch length for the launch tube. I'm using schedule 40 transparent PVC ( web search " Ryan Herco flow solutions clear pvc" to find a local source for clear pvc. Clear pvc is expensive however it adds a high cool factor).
3, 1/2 inch "T" pvc fittings
piece of paper to stuff tightly into the end of the launch tube
1 hot glue stick
Step 2: Fuel, the Best Safe Fuel
high power yet burns at a low temperature
leaves no residue
easy to ignite
what is it?
cooling spray for first aid kits
why is it so good for combustion launchers?
super low boil off point
no residue (hairspray and deodorant leave residue)
low temperature combustion unlike other superfuels like mapp gas, this will not melt the launcher or projectiles.
look at the photos for additional details including ingredients.
Step 3: The Assembled Launcher
Step 4: Ignition Tube Assembly
Inject a sizeable amount of hot glue at the end. This forms a seal. See the photos for additional information.