The PZL SW-4 Puszczyk (en: tawny owl) is a Polish light single-engine multipurpose helicopter manufactured by PZL-Świdnik.

[4] The original design for the SW-4 called for it to be powered by a 300 kW (400 shp) PZL Rzeszow GTD350 turboshaft engine, as featured upon the prototype mockup.

According to PZL-Swidnik, the early SW-4 could reach the rated top speed of about 240 km/h (130 kn) and a max range with auxiliary fuel tank about 900 km (485 nmi).

[citation needed] A decision to redesign the main rotor head resulted in considerable delays to the flight testing program; during this time, other changes were made to the rotorcraft, included the horizontal stabilizer being extended and improvements of the hydraulic systems.

[citation needed] In 2002, the first production model SW-4, which was equipped with the Rolls-Royce engine, was approaching receipt of certification from the Polish civil aviation authority.

[7] Following on from the certification of the Rolls-Royce model, PZL Swidnik pursued a separate re-certification for a modified SW-4 fitted with a Pratt & Whitney Canada PW200 powerplant as an alternative option.

[15][16] In 2013, AgustaWestland was given a Royal Navy contract for the SW-4 Solo's development as part of the UK's RWUAS (Rotary Wing Unmanned Air System) Capability Concept Demonstrator (CCD) programme.

Amongst the changes to this commercial variant include flight performance changes to provide for increased smoothness and greater control authority, the integration of a mass vibration absorber, the adoption of a Genesys Aerospace glass cockpit common to the larger AgustaWestland AW119 Koala, hydraulic improvements, and an optional upgraded Model 250-C30R engine.

[27] The SW-4 is capable of transporting up to five people, including a pilot, in crashworthy seats; passengers are provided with a high level of external visibility and comfort, an optional vibration absorption system is also offered.

[25] PZL- Świdnik stated that multi-role operations had been a high priority during the SW-4's development; and that the rotorcraft is well-suited to passenger transport, primary and advanced training, patrol and surveillance missions.

[25][27] Both basic and advanced trainer variants of the SW-4 have been developed to conform with NATO standards and military pilot training regulations, it is promoted as possessing a high level of inherent flight stability and safety; the advanced model is compatible with night vision goggles (NVG) and is equipped with an emergency simulation unit.