Viper SD4 
Skyper GT9 
Certificates Viper SD4
Viper SD4:
- certified in a number of national enviroments (including certificates from the Czech LAA and the Slovak Aviation Authority)
- a type certificate issued by the Czech LAA
- vydaný typový certifikát od LAA ČR
- possible Certificate of Airworthiness in the Czech ELSA national MTOM 600 kg KET category
- A number of aircraft registered at SFUL
Certifcate Viper SD4 - towing special (UL category):
Viper SD4 successfully passed the tests to confirm the towing of gliders up to 750 kg. The Honorable Institution in France, the Center National de Vol à Voile, Château-Arnoux-Saint-Auban has confirmed the results of the tests and the Viper SD4 obtained a certificate for towing the gliders (UL category) in France.
