This aircraft paper model is a Zenith STOL CH 801, a four-seat sport STOL aircraft developed by Chris Heintz and available in kit form from the Zenith Aircraft Company, this paper plane is designed by stahlhart.
The STOL CH 801 is a four-seat sport utility kit aircraft based on the successful two-seat STOL CH 701 design developed by aeronautical engineer Chris Heintz in the mid eighties. Since its introduction in 1986, more than 400 short take-off and landing STOL CH 701 aircraft have been successfully built and flown around the world, many being used for light utility purposes.
The larger STOL CH 801 has been developed to expand the utility of the STOL CH 701 model by increasing the useful load from 500 lbs. (225 kg) to 1,000 lbs. (450 kg.) while retaining the original design's short and rough field capability. While the two designs share many similarities in appearance, they actually do not share any airframe parts due to the significantly larger size of the STOL CH 801.
You can download this airplane papercraft here: Zenith STOL CH 801 Free Airplane Paper Model Download