reguarding the sk540 fbl unit,,i had a bit of a set up dilemma reguarding the tail,,the design of the n5c tail has 5 degrees offset built in to counteract the torque of the main blades,, so with all arms at 90 you should have 5 degrees of pitch on the tail blades but the problem arose as the sk540 apparently needs to see zero pitch on the blades,,so the synergy gys said run the 5 degree offset as designed and the skookum guys said no it needs to see zero,,any how i went with the zero which meant the tail controll arm wasnt at 90 and the tail slider was well over to the 1 side,,now i still managed 98/98 in both directions for teh tail so flew it any way and it flew fine,,had a little twitch in the tail but upping the gain sorted 99%of it ,think the rest is down to the belt too slack and the rich running motor,ive now set it back to the 5 degree offset for my next flight and will report back once its been in the air again