Three generations of EXTRA300 simulated aerobatics. Excellent 3D performance. The wing with hollow structure is designed with high strength, no deformation and clean movements. The 18mm diameter carbon fiber wing cannula has high strength and light weight. Three generations of improvement: upgrade the motor material, the power is 15% higher than that of the second generation, which is more violent. The winglet with wingtip is added, which greatly improves the low-speed lateral flight performance and makes the crane move more easily and easily. Digital steering gear and lengthened steering gear rocker arm are standard, which can improve the control accuracy and stroke, make the action more delicate, and make the rudder surface angle larger. The aileron is upgraded to a spherical rudder rocker arm, which reduces the virtual position and improves the accuracy. Level: 30E. Wingspan: 1m 2 wingspan. Take-off weight: 1180 grams. Motor: 3536 kv:800. Electric adjustment: 4S 40A.