"As Chris says, it could be anything.
 
Aso check that you are in stable mode and not acrobatic. In acrobatic mode is is very sensitive and can look like that if you are over controlling. You can tell you are in stable mode by a very slow blinking of…"

"It is normal practice for helicopter rc pilots to remove the ratchet for this exact reason. A smooth throttle is v important for heli control as accurate throttle is impertive. I would recommned changing to a smotth racthet. I dont know Futaba, but…"

"I had a dud ESC in mine - the BEC portion worked, but it did not detect the receiver - replaced it and all works well - I dont think these ESCs are the greatest quality, so a few seem to be DOA or faulty.
 
- Could also be bad solders- the motor…"

"Thanks Jani,

I plan to go flying tomorrow so I will give it a shot - I will reduce the angle factor a little and see the impact, else could also add negative expo to increase response.

I plan to do some FPV on it, but still getting used to FPV in…"

"Thanks will do - else this flies great, even with mixed escs dude to one being DOA."

"I seem to also have a motor glitch; it is clear one motor (back right) drops out for a second and recovers - I think I will try and resolder all the bits and check again."

"I am sure I did this, but will check when I get home - if this is the case - i owe you a beer."

"Oh and the only switches i have on now in the code is the #define Configurator

From Code:
1) A, B, C LED's blinking rapidly while waiting ESCs to bootup and initial shake to end from connecting battery
2) A, B, C LED's have running light while…"

"Ok in summary

I do a download - Aurduino is happy and says does download - both orange comms leds go ballistic for 20s and then,
ABC (Green Orange and Red) LEDs flash quickly for 5s then go off.

And thats it.
I open the serial port and nothing…"

"Thanks for you optimism! I will try and order a replacment in case - thanks for all your work on the ArduCopter - nice kit"

"Tried all of that - think its not working - As as I said I have a Turnigy Plush 18A ESC - does it matter if all ESCs not identical? If they have same throttle range and same settings as far as possible - should it work ?

I gues if the acceleration…"

"Mine has arrived - awesome kit - it went together quicker then I thought - an afternoon and it is done - Now I have to figure out the software

Good quality kit!"

"Tried afterwards to order a Mag, but they did not reply, so I just left it - will order it and some spare parts once things settle down."