SpudFiles

Does someone here knows how much % of propane is there is normal hairspray? Because i know that they use propane as a propellant and i would need to know it to convince my dad to switch from hairspray to propane, to make an metered gun . I also know that hairspray attacks the pvc and it leaves it sticky(wich help me too)

And no, you are not spoonfeeding me because i searched a lot on internet and cant find.

Does someone knows it? i dont need exactly, the ten's will be alright.

Most spray cans are more propellant than stuff being propelled. For hairspray i would figure that 80 to 90% of what comes out'a the can is propane.

That assumes it actually uses propane. Some spray cans use a mixture of things like butane, isobutane, propane etc.

As long as it is a hydrocarbon (like the ones listed above) it doesn't really matter since they all contain virtually the same amount of energy when used in a spud gun.

You should read up a bit on what "stoichiometry" means, in particular, what it means in a combustion spud gun. Tell your dad that there is no more or less "energy" in a squirt of hairspray or a squirt of propane. The two are identical. Propane is just a bit cleaner, easier to use and cheaper than hairspray.

Go find out why too much fuel in a combustion spudgun is not a safety problem. Once you understand that overfueling is not dangerous then you can explain to your dad why it doesn't make any difference if you use hairspray or propane, the energy in the chamber will be the same.

The only real difference is that with propane it is much easier to use the correct amount of fuel. If you could find a way to "meter" hairspray it would behave just as well as pure metered propane.

To learn about fuels a good place to start would be the spudwiki page on combustion spudgun fuels;
http://www.spudfiles.com/spud_wiki/inde ... n_Spudguns