Dude nicely done on this.... my stuff don't hold a candle to this. Keep it up man. Oh, and might I suggest some Wind Vortex, Tech to give it that extra BOOM effect? It will make the flames look awesome!
Hmm, interesting. I see only one tank with fuel. In reality, hand held flamethrowers use two kinds of tanks - one for burning liquid and second one for pressurised gas that's used to propel and eject the burning fuel. Using mechanical pump to achieve good pressure for the stream would not be possible because such device would become too heavy.
However, if it would be possible to generate enough power to generate required pressure of the liquid, then it would also be possible to create a single tank flamethrower. The concept would in fact be similar to some degree with minigun (and your design), but instead of using electric drive to rotate barrels it would use that power to rotate pump. If would also take while for the pump to spin to operating speed, making it very similar to miniguns.
Another approach could be using some of the fuel to propel small gas turbine that would then propel the main pump. It wouldn't need heavy power supply then, but you would lose some fuel just to fire the darn thing.
Anyway, interesting. Forbidden by modern conventions but still... interesting
my favorite weapon in just about any game the only problem is I never find enough ammo to make it a good gun to use regularly. sides nothing says good morning like a enemy toasting and running around alite with your gun.