VIPER SD4 ALL-METAL LSA - Interview of Dan Johnson with Adrian Lecky, sales agent of Viper SD4 in USDevelopment and manufacture of the Viper SD4 and Skyper GT9 Ultralight (UL) / Light Sport Aircraft (LSA) planes, is done in TOMARK s.r.o., TomarkAero and TomarkAero CZ Division, by experienced specialists in aviation and mechanical engineering. The latest technologies and CAD systems, as well as CNC machining, are used in their manufacturing.
We offer you exclusive photos from the production and finishing, unique photos from strength tests of the plane’s structure under various loads. The uniqueness of Viper SD4 is also in the fact that it is one of the few planes in its category that have successfully passed the elasticity tests of all its parts, the so-called Flutter tests. Viper SD4 successfully mastered the SPIN tests, which are necessary for obtaining a certificate EASA CS-LSA. Viper SD4 RTC has been certified according to EASA certification specifications CS-LSA Amdt.1. EASA.A.606
Our primary intention is to offer you, our partners, customers, and aviation enthusiasts, specialised information, quality consulting and exclusive documentation. If you like the things you learn, photos and videos, or if they inspire you or encourage you to propose a change or modification, please let us know. We look forward to your views and ideas.
Viper SD4 and Skyper GT9 websites
We bring you a product web sites Viper SD4 and Skyper GT9. Inside you'll find extensive information and gallery of TomarkAero products
Viper is an excellent low wing aircraft which does not seek eccessiveness but rather comfort and worthiness. Classic construction, the aiplane sits on a wide main landing gear which could easily accomodate. The cockpit is the most comfortable and widest I have ever tried on aircraft of this class, its well ventilated which is very appreciated under its large canopy.In flight I noticed two things, a perfect balance of the ailorons which work practicaly on their own during strong turbulance and a perfect right sided off axis of the engine which allows cruise flight with perfect control. Both qualities which are usually not found in light aircraft.
Diego DONNA, test pilot, (Italy)
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Viper SD4 RTC. Flight: Košice - Bratislava - Trenčín - Zlín - Žilina - Košice
Viper SD4 
Skyper GT9 
