A tip for you.

For TAKE OFF ONLY, put in 1 or 2 clicks of up elevator on the transmitter.

As others have said, hold full up elevator while taxing, use a SMOOTH advance on the throttle (do not jam it to wide open ) and be ready to add in some rudder as soon as the tail lifts off.

With the 1 or 2 clicks of up elevator, what I do is:

Taxi out to where I will be starting my take off run and stop the plane.

Recheck your control movements.

Add the 1 or 2 clicks of up elevator.

Leave the elevator IN THE NEUTRAL POSITION.

In a smooth steady motion, advance the throttle to full throttle (do a count while you advance the throttle - one thousand one, one thousand two, one thousand three, one thousand four. You should be at full throttle now ).

WATCH THE PLANE. As soon as the tail lifts off be ready to feed in A LITTLE RIGHT RUDDER.

The plane should lift off by itself when it reaches flying speed.

Climb up to altitude.

Take out the one or two clicks of up elevator.