I've got a character making homemade napalm bombs and I need to know if she can't find a lighter, can she just shot the damn thing to make it explode?
Don't know if you need to know the ingredients, but just in case:
styrofoam cup
vodka
plastic wrap, secured around the top with a rubber band
paper towel ripped to size for the fuse
gun powder from a bullet
She had the gun and found the other stuff in a kitchen, but I think leaving a lighter there is too convenient, so I thought I'd see if shooting it was realistic enough to improvise with.
Thanks for the tips!
1) Napalm doesn't explode. Napalm is a jellified hydrocarbon that is generally contained in a frangible metal container and dropped from an airplane. The energy of impact spreads the napalm which then burns slowly. You actually want Napalm to splash, but you want it to splash in big blobs, not as tiny drops.
2) As opposed to rednecks who every summer blow themselves up starting grills with gasoline, it is actually quite difficult to get gasoline to explode. Believe me, I've played with it enough. Gasoline will only burn in the presence of oxygen. And since gasoline vapor is heavier than air, it tends to sink and displace the air instead of mixing. To mix fuel and air you need a lot of turbulence. So to get it to explode it must be vaporized and mixed with air, and the two must be in something at least close to the proper proportions - around 14:1, air to fuel. Fuel air explosives use a charge to disperse the fuel, then a powerful igniter. Automobiles inject just the right amount of fuel into a cylinder, compress the fuel - which raises the temperature hundreds of degrees - then a 20,000 volt spark.
3) Vodka, or any typical alcoholic drink, is highly resistant to exploding, primarily because they are usually half or more water which makes vaporizing the flammable liquid very difficult. Shooting a bottle of vodka will not make it explode. It will probably not even explode if shot with an incendiary round.
4) Flammable liquids will burn though, but try lighting some vodka some time. It is harder than you think.
5) If you are going for ultimate realism, try a propane canister or maybe garbage bags filled with natural gas from a stove.
6) You do have an ace in the hole. 90% of the population thinks just about anything will explode if you shoot it enough times. Even water. Shoot the bomb, have it blow, and thumb your nose at the 10% who think it's fakey.
-MM