|Role||Two seat ultralight|
|First flight||1 November 2006|
|Number built||110 by July 2016|
Ultralight from €63,000
LSA €65,000 plus tax.
The Tomark Viper SD4 is a Slovak single–engine, all-metal, two-seat low wing monoplane with a fixed tricycle undercarriage and side-by-side seating for two people. The aircraft is built by Tomark s.r.o. of Prešov.
Design work on the Viper began in 2004, with the first flight on 1 November 2006 and market introduction in 2008. It is intended for touring, training and glider towing.
The Viper is constructed mostly of metal, with aluminium skinning, using CNC machining. Composite materials are used for the tips of the flying surfaces, the fuselage upper decking, engine cowling and wheel fairings. The wings have constant chord and curved, slightly upswept tips; they are built around one main and one auxiliary spar. The short span ailerons move on piano-type hinges, with slotted flaps on the rest of the trailing edges. The low-mounted horizontal tail is also of constant chord apart from a cut-out for rudder movement; the starboard elevator carries a flight adjustable trim tab. Fin and rudder are straight-edged, but swept.
The standard Viper is powered by a 60 kW (81 hp) Rotax 912UL flat four engine but the more powerful 75 kW (100 hp) Rotax 912ULS is an option. The forward fuselage is a monocoque, the rear a tube structure with an aluminium skin. The cockpit seats two in side-by-side configuration under a framed single piece canopy, with further transparencies in the fuselage immediately aft. The main undercarriage legs are cantilever springs. The mainwheels are faired and fitted with hydraulic brakes; the nosewheel is also faired and may, as an option, be steerable. Other options include instrumentation, ballistic parachute and towing gear.
The aircraft received its EASA SD4 RTC restricted type certificate in March 2016.In the US it is an accepted light-sport aircraft.
The first two production aircraft appeared at AERO Friedrichshafen in April 2007. AERO 2009 saw the first example of the Ultralight version and the announcement of the LSA variantIt was originally aimed at French flying clubs but is now being marketed in the USA following certification in October 2010. US production at Winnsboro, Texas is under consideration.
By mid-2010 there were two Vipers registered in France and ten in Slovakia.By November 2010, 26 had been built.
Data from Jane's All the World's Aircraft 2011/12
The Kappa 77 KP-2U Sova, later produced as the Jihlavan KP-2U Skyleader and most recently as the Jihlavan Skyleader, is a two-seat civil utility aircraft designed in the Czech Republic and available in kit form for home building. It is a conventional low-wing monoplane featuring all-metal construction and tricycle undercarriage.
The Flight Design CT series is a family of high-wing, tricycle undercarriage, two seat, ultralight and light-sport aircraft produced by Flight Design of Germany. The family includes the original CT and the CT2K, CTSW, CTLS and the MC models.
The CSA SportCruiser is a two-seat, single engine, tricycle undercarriage, fixed-wing aircraft that was introduced in 2006 by Czech Aircraft Works (CZAW), now named Czech Sport Aircraft.
The SportStar and EuroStar are a family of a two-seat, light sport aircraft (LSA), manufactured by Evektor-Aerotechnik of the Czech Republic and powered by a Rotax 912ULS, 100 horsepower (75 kW) engine.
The Remos G3 Mirage and Remos GX are German high wing, two seat, single engine light aircraft, built by Remos AG of Pasewalk. The aircraft is supplied as a kit for amateur construction or complete and ready-to-fly.
The Pipistrel Virus is a two-seat, single engine light aircraft, manufactured by Pipistrel in Slovenia and Italy, and sold as an ultralight, homebuilt kit, or light-sport aircraft.
The B&F Fk14 Polaris, also called the FK-Lightplanes FK14, is a single-engine, low-wing ultralight aircraft that seats two side by side. Designed in Germany in the late 1990s, it remains in production as of 2011.
The Breezer is a low-wing, single-engine ultralight aircraft, seating two side by side. Designed and built in Germany, it meets both European and US light light-sport aircraft requirements and has been in production since 2001.
The Roko Aero NG4 is a single-engined sport aircraft, available in both light-sport aircraft and ultralight models, which seats two side by side. It is in production in the Czech Republic.
The BRM Aero Bristell NG 5, now called the Bristell Classic, is a Czech low-wing, two-seat in side-by-side configuration, single engine in tractor configuration, ultralight and light-sport aircraft that was designed by Milan Bristela and is produced by BRM Aero. The aircraft is supplied as a complete ready-to-fly aircraft.
The TL Ultralight TL-3000 Sirius is a conventional single engine high wing ultralight and Light-sport aircraft seating two side-by-side. It was designed and is produced in the Czech Republic.
The UL-Jih Fascination, also called the Fascination F100, is a conventionally laid out, two seat, low wing, single engine ultralight, designed and built in the Czech Republic. Two variants were offered in 2010.
The UL-Jih Evolution is a conventionally laid out, two-seat, high-wing, single-engine ultralight, designed and built in the Czech Republic. Two variants were available in 2010.
The Groppo XL and Groppo Trail are very similar single engine, tandem seat, high wing ultralight aircraft designed and built in Italy. Both can be supplied complete or in kit form. The two models differ chiefly in undercarriage type.
The Aerospool WT9 Dynamic is a Slovak ultralight and light-sport aircraft, designed and produced by Aerospool of Prievidza. The aircraft is supplied as a complete ready-to-fly-aircraft.
The Flaeming Air FA 04 Peregrine is a German ultralight and light-sport aircraft, designed and produced by Flaeming Air of Zellendorf, Brandenburg. The aircraft is supplied as a complete ready-to-fly-aircraft.
The Apollo Monsoon is a Hungarian ultralight trike, designed and produced by Apollo Ultralight Aircraft of Eger. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.
The BDC Aero Puma is a Canadian ultralight and light-sport aircraft, originally designed by the Italian aircraft designer Antonio Bortolanza and built by Aeroplast of Sale, Piedmont, Italy. It is currently produced by BDC Aero Industrie of Lachute, Quebec. At one time available as a kit for amateur construction, now the aircraft is supplied only as a complete ready-to-fly-aircraft.
The Rokospol Via is a Czech ultralight and light-sport aircraft (LSA), designed and produced by Rokospol Aviation of Prague, introduced at the Prague airshow in 2008. The aircraft is supplied complete and ready-to-fly.
The Tomark Skyper GT9 is a Slovakian ultralight and light-sport aircraft, designed and produced by Tomark of Prešov, introduced in 2014. The aircraft is supplied complete and ready-to-fly.