The PZL P.11 was Poland’s principal fighter aircraft at the outbreak of World War II.
Designed in the early 1930s by Zygmunt Puławski and built by Państwowe Zakłady Lotnicze (PZL), it featured a high-mounted gull wing and all-metal construction.
Though revolutionary at its 1934 introduction, by 1939 it was obsolete compared to contemporary German aircraft.
Deployment in the September Campaign
At the start of the German invasion on 1 September 1939, the Polish Air Force fielded approximately 129 PZL P.11 fighters, including:
20 P.11a models (early production)
109 P.11c models (main combat variant)
These aircraft were distributed among pursuit squadrons of the Pursuit Brigade and army cooperation units, with concentrations around Warsaw and key field army sectors.
Combat Performance
Despite its outdated design, the P.11 was flown aggressively in the defence of Polish airspace.
Its strengths included:
Excellent maneuverability at low altitudes
Rugged construction suitable for rough-field operations
Experienced pilots, many of whom had trained extensively on the type
However, the aircraft faced overwhelming disadvantages:
Inferior speed and climb rate compared to German Bf 109s and bombers
Light armament of two or four 7.92 mm machine guns
Lack of radios in most aircraft, hindering coordination
No armor or self-sealing fuel tanks
Despite these limitations, Polish pilots flying the P.11 achieved notable successes.
Confirmed kills included:
Messerschmitt Bf 109s, Heinkel He 111s, Dornier Do 17s, and Henschel Hs 126s.
The exact number of victories remains debated, but estimates suggest 30–40 German aircraft were downed by P.11 pilots in the campaign’s early days.
Losses and Withdrawal
Losses were severe.
Most P.11s were destroyed in combat or on the ground during Luftwaffe raids.
By mid-September, surviving aircraft were increasingly relegated to reconnaissance and liaison roles.
A few were evacuated to Romania, where they were interned or used for training.
Legacy
The PZL P.11’s wartime service was a testament to Polish pilot skill and bravery.
Though technologically outclassed, it was the backbone of Poland’s fighter defence in 1939.
Its combat record—while modest—symbolised resistance against overwhelming odds and marked the end of the gull-wing fighter era.
