Tips for Trimming your Syma DragonFLY

You'll probably find that out of the box your DragonFLY doesn't fly all that well - certainly mine just spun round and round and from what I've heard they all do. The trick is to spend a little time fine tuning various aspects of the helicopter. There are two main things you need to do. The first is to stop the DragonFLY spinning round all the time. The second is to get it flying forward. Note that you really need a wide open space to fly this helicopter - indoors is a no-no. Unless you live in an aircraft hangar!
The first is the trickiest, and varies from model to model. The only adjustment provided is a small potentiometer located on the control box in the cabin (indicated by the green circle):



This varies the threshold at which the tail motor increases its revs - although mine doesn't seem to do anything anymore. If you look at which way the helicopter spins - or hold it and feel which way it is pulling - you'll probably find the tail rotor is too powerful and it's actually spinning the same way as the rotors. If so trim off a small amount from each blade of the tail rotor until you have achieved stability. Now you should be able to spin it round with the transmitter to point in the right direction.
I find that my DragonFLY still spins when taking off, before it settles down to stable flight. I haven't found a way to stop that yet - but I'm working on it...
Because the DragonFLY has no cyclic pitch control the only way for it to move forward other than being blown by the wind is if it is out of balance. Stick a weight in the nose to achieve this. I settled on a large washer in the end which provides about the right speed. The heavier the weight, the faster it will fly, and the quicker the batteries will run out!