DG-505 4m Electric Factory already installed air electric brake in the wings Model no. : FF-B043C Specification : Material : Epoxy fuselage /Balsa wood wings Wingspan : 4000mm Length : 1375mm Wing Area : 72 dm sq. Flying Weight : 3800g-4200g Recommended Power system:Included Retract gear: Aluminum Retract glider / Wheel 2.7"