Since March 2017 the design has been built by HMS Aviation, which is also located in Krosno, Poland.[3]
The Czajka was designed to comply with the Fédération Aéronautique Internationale microlight rules and US light-sport aircraft rules. It features a cantilever high-wing, a two seats in side-by-side configuration enclosed cockpit, tricycle landing gear and a single engine in tractor configuration.[2]
The aircraft is made from carbon-fiber-reinforced polymer. Its 9.721NaN1 span wing employs Fowler flaps to keep the stall speed low enough for the FAI microlight category. The standard engine provided is the 1000NaN0 Rotax 912ULS four-stroke powerplant which gives a cruise speed of 2300NaN0. The cockpit is 1.2150NaN0 wide.[2]