This paper model is Delta Glider, an Orbiter Space Flight Simulator, the papercraft is created by Juanelm. There are blue and red two versions. Orbiter is a freeware space flight simulator program developed to simulate spaceflight using realistic Newtonian physics. For more information please click here.
You can download the paper model templates here: Orbiter Space Flight Simulator "Delta Glider" Paper Model Free Download [Blue]