I just installed a pair of flat bottom rotors on my CP Pro and it wouldn't even come off the ground. I moved the control links to give it more pitch and it will now fly but it seems to take more power to get it moving. Hover is just over 3/4 throttle and the red light is on constantly while flying. Is this normal? Also what can I not do with the flat blades verses the stock blades other than inverted flight? (Can I still do a quick loop?)
Thanks
Guy

I had the opposite effect. I have been flying my Blade CP using the flat bottom blades. I tried to use the aerobatic blades and could not get much lift with them. ( Just thought I would give them a try.) Anyway just increase your blade pitch a little at a time until you can hover at about 3/4 throttle, with out the red light coming on, at least until you are at about full throttle.

flat bottom blades are generally more aerodynamically efficient than symmetricals, so they take less power. you usually need to reduce the pitch of the blade grips when going from symmetrical to flat bottomed, since flatties have a built in positive angle of attack.

sound like you have too much pitch, which reduces rpm and boggs down your motor. in this situation your motor will draw too much current and you will not achieve the maximum lift available from your heli. adjust the pitch links (the ones above the swash, not the ones attached to the servos) so the heli just gets light on the skids around 1/2 throttle. this usually means you'll end up hovering around 3/4 throttle like DVI said.

the other possibility is your main motor is going bad. if it is, you'll have similar symptoms.