A shortage of engines was a major obstacle to mass production and development of the IK-3, so tests were conducted with more powerful engines, including the Daimler-Benz DB 601, Rolls-Royce Merlin II and Hispano-Suiza 12Y51.
The tests were incomplete at the time of the Axis invasion, and the only prototype to be fitted with a non-production engine was deliberately destroyed by factory personnel during the invasion, along with the incomplete production aircraft.
Development of a dual-control two-seat trainer variant of the IK-3 had commenced but pressure on the design team had delayed the completion of the project when the invasion intervened.

The development of the IK-3 encouraged the three designers to pursue the idea of a twin-engined fighter, capable of long-range reconnaissance, photographic reconnaissance and operation as a "destroyer" or heavy fighter similar to the Messerschmitt Bf 110.
The concept included both one-seater and two-seater versions.
Development of this new aircraft, designated IK-5, was commenced on the back of the success of the IK-3.
The VVKJ ordered a one-seater prototype in early July 1939, with its first flight scheduled for late 1941.
At the time of the invasion, the production of the IK-5 prototype was well advanced, but it was not pursued either during or after the war.
The advanced Yugoslav Ikarus S-49 fighter, produced after World War II, was based on the IK-3.
A shortage of engines was a major obstacle to mass production and development of the IK-3, so tests were conducted with more powerful engines, including the Daimler-Benz DB 601, Rolls-Royce Merlin II and Hispano-Suiza 12Y51. The tests were incomplete at the time of the Axis invasion, and the only prototype to be fitted with a non-production engine was deliberately destroyed by factory personnel during the invasion, along with the incomplete production aircraft. Development of a dual-control two-seat trainer variant of the IK-3 had commenced but pressure on the design team had delayed the completion of the project when the invasion intervened.
The development of the IK-3 encouraged the three designers to pursue the idea of a twin-engined fighter, capable of long-range reconnaissance, photographic reconnaissance and operation as a "destroyer" or heavy fighter similar to the Messerschmitt Bf 110. The concept included both one-seater and two-seater versions. Development of this new aircraft, designated IK-5, was commenced on the back of the success of the IK-3. The VVKJ ordered a one-seater prototype in early July 1939, with its first flight scheduled for late 1941. At the time of the invasion, the production of the IK-5 prototype was well advanced, but it was not pursued either during or after the war. The advanced Yugoslav Ikarus S-49 fighter, produced after World War II, was based on the IK-3.
Rogožarski IK-3