The SZPAK-2 was designed in Lubin, Poland, during the closing stages of the war, and later built by LWD / Lotnicze Warsztaty Doswiadczaine, first flying in November 1945 as SP-AAA. Limited production was undertaken by PZL Mielc.
The SZPAK-3 was an experimental modification with a fixed nose-wheel undercarriage, first flying on 23 December 1946.
The SZPAK-4 was developed from the SZPAK-2 and -3 as the SZPAK-4A two-seat, side-by-side, advanced trainer, and the SZPAK-4T four-seat tourer.
Spzak-2
Engine: 150 hp Siemens Sh 14
Wingspan: 11.3 m / 37 ft 1 in
Length: 8.2 m / 26 ft 10.75 in
Wing area: 18.1 sq.m / 194 sq.ft
Empty weight: 650 kg / 1435 lb
Gross weight: 1200 kg / 2645 lb
Ruise: 150 kph / 93 mph
Range: 650 km / 405 mi
Ceiling: 4500 m / 14.760 ft
Seats: 4
SZPAK-4T
Engine: PZL-built Bramo Sh.14, 160 hp
Wingspan: 37 ft
Wing area: 189,5 sq.ft
Length: 28 ft 2 in
Height: 7 ft 8 in
Empty weight: 1433 lb
Loaded weight: 2645 lb
Max speed: 121 mph
Cruise: 100 mph
ROC: 450 fpm
Range: 435 mi
Seats: 4
All Aero 