What is the deal with header tanks? (the secondary tank on some helis) what do they provide, and is it worth it? if so, how exactly do you make a header tank?

well header tanks are great, they prevent air from entering the fuel line when performing
numerous 3d stunts, in turn causing the engine to "hick-up" or stall. the act as a air trap pretty
much, also depending on the size they can add to flight time. i use mine (by accident) for an
emergency. i was running and forgot to check my fuel level and i was on the header tank so it
saved me pretty much.



there great and I would get one, consider them as necessary as blades or for some training gear.

cool, is it possible to buy one, or do you have to make it?

you probably can buy them anywhere where you can buy RC-helis, starting at $12.- or so. they are not as important as having blades, but when installed properly (at the height of the carb.) the engine will run consistent in any flight position.
you can run your main tank empty and you will hear and see the difference once the engine starts using fuel out of the header tank

i was just saying that for me becuase when i fly 3 d the clunk sucked air and i crashed. this happen twiced that's why there best for me