The ingenious designers at Estes reviewed the concept drawings and were able to capture enough information to create this replica. This scale model of the Cosmos Mariner has many interesting design features that create a masterful reproduction of the original design. In addition to laser cut balsa parts, this glider/rocket also features a clear molded top and bottom glider shell for added realism and awesome glider flights. Assembly of this Skill Level 2 kit requires some experience with scale model rockets. In terms of size, this high-flying model is 18 inches (45.8 cm) long and has a wing span of 13.5 inches (34.3 cm). When powered with a D engine, this unique concept rocket plane can reach altitudes of 250 feet (76 m) and then glide to the ground in a realistic manner while the power pod floats back to earth on a 18 inch (46 cm) preassembled parachute