Amateur-built, but still very well constructed Racek 3 glider, built in the mid-1930s. The design came from the joint efforts of František Kantor and František Štrupl in 1934. F. Kantor built it alone; in 1937 Karel Kuklík began helping with production.

The glider was first flown at the Kbely airport on October 24th, 1937. The test pilot was S. Rodovský. The first takeoff was a tow behind an extremely quick military airplane AERO Ab-111. The glider handled quite well, both in tow and in free flight, and reacted well to control inputs. The aircraft was immediately cleared for flight.

František Kantor later recalled this event: "Sunday, October 24th the flight took place with Radovský's assistance behind an extremely fast Aero 111 military airplane. A slower one was not available right then. The entire time of the flight I was trying to stand aside and with closed eyes – waiting to see what would happen. I was worried, only occasionally did I sneak a look. I felt responsibility, nervousness and fear. I don't even know if Radovský had a parachute. During the test in Kbely, soldiers were present. One highly polished and decorated officer asked, "Who built it?" Everyone pointed at me, and I was ready to die of embarrassment. I was wearing a worker's cap and a suit coat, threadbare and splattered with adhesive, and knee breeches. The expressions of wonder on everyone's faces were a sight to see."

The glider was transported to the Raná u Loun airport. In June of 1938, there was a glider competition in Raná, during which this glider was damaged – the pilot caught a tree with his wingtip. The Racek was transported for repairs, but these dragged on, and in the meantime, the Nazis occupied Czechoslovakia and prohibited further flights.

The glider was test-flown again after the war, and presented to the public in May, 1947. It was removed from service in 1948. In 1951, it was acquired by the museum, as a gift from the owner, František Kantor.

The glider has an oval fuselage, covered in plywood, all wooden construction and high-winged. The pilot's cabin is covered with a transparent canopy. Behind the cabin, on the upper part of the fuselage is the attach point for the wings, which use a Göttingen 527 airfoil, have a wooden frame and are covered in fabric. The horizontal and vertical stabilizers are permanently bonded to the frame, also with a plywood surface. The wings' leading edges back to the first spar are covered in plywood, the rest in fabric. The glider landed on an ash skid, sprung with rubber blocks under the fuselage.

Technical parameters:
Wingspan: 15.2 meters
Length: 6.5 meters
Fuselage height: 0.97 meters
Wing surface area: 14 square meters
Empty weight: 210 kg
Flight weight: 310 kg
Maximum speed: 65 km/hour