ORIGINAL: chopperdudes
i'm off of 3d's yet, i can do stall turns or maybe few loops? i've just encounter another problem. i've setup my 7c to allow maximum (when i say max i mean it
) throw for all the functions (aileron, elevator, pitch etc) without binding. when i fly in normal mode (hovering) i cannot get the high end of the pitch/throttle, when i go higher than per say, point 4, the motor stalls and my heli drops. maybe a new motor? it was fine a few flights ago, and as i said, i could make the blade cp 'jump'. but now, that just wont happen. in idle up 1 it's the same, in idle up 2 it's ok because i'm keeping the throttle at 100% at all 5 points, i hope it's the motor not the battery, i did have packed over 60 i'd say on that lipo pack (number of crashes). i brought it out to the field today and all i did were semi stall turns, i was gonna try my 6 loop today (crashed 2 out of 5 i've done so far). but seeing that teh headspeed decays soooo badly, i didnt do it.
It sounds like your pitch to throttle curve is too high. Too much or little pitch at a certain throttle speed. I would say you have too much pitch too soon. In your idle up 2, how much stick do you have at a good hover. That will tell you where the bird is comfortable. What I did is disconnect the motors and with the switch in idle 1, make sure it's zero pitch at mid-stick and +10 at full. Then set up the rest of the pitch setting linear to that. And do the same in negative. The I flipped the switch back and forth from normal to idle 1 to make sure it wasn't jumping in pitch at what would be roughly 60% throttle on up. I saw a video from another forum which recommended it and it has worked great for me.
As far as the bec is concerned, it regulates the amount of voltage at any particular point. Case in point, servos are only designed to take 4.8 or 6 volts. You couldn't use an 11.1 volt battery without a bec. Also when you come out of a loop and suddenly throw the stick it doesn't allow a surge and fry everything. Most esc's have a built in bec. In dual esc configurations (like using separate esc's for the main and tail) the weaker of the two bec's has to be disabled or the two will try to overcompensate for each other and actually allow the surge.