This is my flamethrower which uses ISOPROPANOL as a fuel. It is only capable of a range around 1 ft, but is quite powerful. More experiments would be needed with the fuel to increase the range and effect any further. Range is still be limited by the diameter of the lego tubes. There are interesting design possibilities regarding a longer burst, (this is currently a single-shot weapon), including the use of an air tank...!
I have not continued investigations along this line as the range of the weapon is so limited.
However, it is quite capable of setting fire to paper huts, which was all it needed to do!.
This is a PROPER flamethrower. Twin lego cylinders are used to eject the fuel (same as before) from a syringe (from an ink cartridge refill kit). This gives the advantage of a smaller hole (the syringe has a metal end) which can be shaped with a handy pair of pliers..
The same tubing sytem is used as before, but this time the valve connects to two "instant action" cylinders (the old type, only one input). These have a greater csa (cross sectional area) than the syringe, so they give loads of power to force the fuel through the fine nozzle. The flame is 1-2 metres in length and can set fire to stuff in that range. I have two syringes, each in their own holder for quick changes. The ignition flame is provided by a blu-tack mounted candle on the end of an adjustable boom at the front of the flamethrower. This is a parallel wossname, so it moves up and further away from the syringe, or down and closer to it. This allows me to adjust for the decrease in the candle's height as it burns.
VIDEOS ARE HERE! go to VIDEOS. Right click and "save link as". Maybe more videos in the future, but please leave reviews on my MOC pages so that I know if anyone is interested!