Stability and safe are upgraded, no need to remove when folding and storing the quadcopter, and practical. Adopt quick releasing and folding, quick installation, and practical. Lightweighted and stable to carry the fuselage, hardly affecting quadcopter flighting; Effectively increase the height of about 30mm, protect the fuselage from dirt and scratches; Firmly lock the fuselage for stable installation, without affecting the positioning at the bottom of the fuselage;