Hi guyz...I just need a little help here,
I just notice that the throttle of my transmitter is just about 20% but the heli is increasing the RPM in a high speed w/o touching or moving the throttle. The heli is on the platform, Is it normal?
Thanks!!!...

You should have two settings in your transmitter that can be adjusted to get different behaviors of "RPM" (I usually see it called "head speed" or "rotor speed"). There is usually a throttle curve setting and a pitch curve setting. These two settings will tell the transmitter how calm or wild the collective will behave at different stick positions.

Here's a good link to a forum topic on that subject:

http://www.rcgroups.com/forums/showthread.php?t=1651066

If I understand it correctly, on a collective pitch heli, the rotor speed is usually set so that it spins up to operational speed before you actually lift off, with the pitch still at a slightly negative or zero angle. Then it should stay at that speed and just use the angle of the rotors to go up and down in flight (though agressive 3d is probably not like that).

Thanks alot for your time and may GOD BLESS YOU ALWAYS...