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A telescopic wing is a shape-changing method of the aircraft wing known as the morphing wing system. Wingspan extends capability on telescopic wing increasing the aspect ratio to get a high lift force. The telescopic wing on a flying wing configuration as an external wing and glider wing as an internal wing can be used to increase the coef f icient lift (C L ) when carrying out special missions. The aerodynamic characteristics using the Computational Fluid Dynamic (CFD) simulation approach is presented. For the 40% internal wingspan, the highest C L increment was 12.9% at a 10 o angle of attack. For the 50% internal wingspan, the highest C L increment was 14.9% at a 10 o angle of attack. on the 40% internal wing, the highest coe f ficient drag (C D ) increment was 4.7%, and the largest C D increment on 50% internal was 9.5% at the angle of attack of 20 o . The pressure distribution along the internal wingspan was uneven from an angle of attack of 15 o due to the wing tip vortices of the external wing. Streamline pattern shown a bubble separation from the leading edge at an internal wing root by external wing tip vortices. Keywords : Morphing wing , telescopic wing , flying wing, glider