TY JOUR TI VIRTUAL SIMULATION OF PROMISING AIR-TRANSPORT SYSTEM OF BALLOON TYPE KW virtual simulation KW 3D-print KW model KW aircraft engineering KW balloon KW air-transport system JO Bulletin of Bryansk state technical university AU Anamova, R.R. AU Avtushenko , A.. AU Ripetskiy , A.. PY 2016 IS 2016 PB Bryansk State Technical University