PZL P.11 - Variants

Variants

P.11/I

First prototype of the P.11 fighter, powered by a 384 kW (515 hp) Gnome-Rhône Jupiter IX ASb.

P.11/II

Second prototype of the P.11 fighter, powered by a 395 kW (530 hp) Bristol Mercury IV.A in a long chord cowling. Used for comparative tests of Letov Kbely, Bristol, Ratier, Szomański and Chauvière fixed pitch wooden propellers, achieving a best speed of 346 km/h (215 mph) at 4,000 m (13,123 ft) with the Chauvière.

P.11/III

Production prototype of the P.11 fighter, powered by a Bristol Mercury, with simplified structure to ease production.

P.11a

The initial version for the Lotnictwo Wojskove - (Polish Air force), which ordered thirty, actually built after completion of the Romanian P.11b order, powered by 370.6 kW (497 hp) – 385.5 kW (517 hp) Polish Skoda Works Mercuty IV.S2 engines.

P.11b

Fifty aircraft ordered by the Romanian Government, powered by 391.5 kW (525 hp) Gnome-Rhône 9K Mistral or I.A.R. 9K Mistral engines.

P.11c

The main production version for Lotnictwo Wojskove.

P.11f

Eighty aircraft, powered by 443.7 kW (595 hp) I.A.R. 9K Mistral engines, built as licence production by I.A.R. in Romania.

P.11g Kobuz (Hobby)

Developed as a stop-gap to fill in for delayed P.Z.L. P.50 Jastrząb fighters by strengthening the structure to absorb the power of a single 626.37 kW (840 hp) P.Z.L. Mercury VIII, with an enclosed cockpit and four improved 7.92 mm (0.312 in) KM Wz 36 machine-guns. The converted P.11c prototype flew for the first time on 15 August 1939, less than a month before the German invasion, forcing abandonment of the programme.