Specialists from the Department of Airspace Engineering of the Faculty of Mechanical Engineering of ČVUT (Czech University of Technology) in Prague carried out tests of the flexibility of the plane’s structure and of all its parts, so-called flutter tests. The basis of the test is in the analysis of the combined effect of aerodynamic, elastic and mass forces in the airplane’s structure. We carried out the measurement of amplitudes and responses in the transmission of vibration waves into the fuselage and wings of the plane. The tests verified the aeroelastic properties of the plane and of its structure and allowed to assess the risk of flutter throughout the plane’s operational airspeeds.

The carried out flutter tests have shown the resistance of all structural parts of Viper SD-4 to flutter under the given distribution of aerodynamic forces. Viper SD-4 completed that demanding test by flight tests - and thus proved its resistance to flutter.