Recommended headspeed of Trex 700X (12S Setup) for your reference.
1. Beginner hovering with max flight time: 1700 to 1750
2. Hovering and moving around (and slow 3D): 1800 to 1850
3. Smooth 3D: 1900 to 2050 (1950 is ideal)
4. Hard 3D: 2100 to 2150
5. Smack and get max noise (min. heli life): 2200 to 2300
1. Beginner hovering with max flight time: 1700 to 1750
2. Hovering and moving around (and slow 3D): 1800 to 1850
3. Smooth 3D: 1900 to 2050 (1950 is ideal)
4. Hard 3D: 2100 to 2150
5. Smack and get max noise (min. heli life): 2200 to 2300