Retaining the wings and horizontal tail surfaces of the I.A.R.12, the I.A.R.13, which made its debut in 1933, achieved an aerodynamically cleaner fuselage by replacing the W-configuration Lorraine engine of the earlier prototype with a Vee-twelve type Hispano-Suiza 12Mc of 500hp. The I.A.R.13 was of similar construction to preceding Carafoli-designed fighters, with a wooden fuselage and wing of mixed construction, and proved under test to have a very good performance. However, the Romanian Aeronautica Militara preferred the gulled shoulder-wing arrangement of the P.Z.L. P.11 fighter to the low-wing configuration of the I.A.R. fighters. In 1934, the Polish aircraft was selected for the re-equipment of its fighter element, with licence manufacture to be undertaken by I.A.R. Nevertheless, the Romanian company was to continue with its own fighter development.
Engine: Hispano-Suiza 12Mc, 500hp
Take-off weight: 1530 kg
Wingspan: 11.70 m / 38 ft 5 in
Length: 7.34 m / 24 ft 1 in
Height: 3.50 m / 11 ft 6 in
Wing area: 19.80 sq.m / 213.13 sq ft
Max. speed: 330 km/h / 205 mph