FSX Polish Sukhoi Su-27 Demo

The Polish Sukhoi Su-27 Demo is a freeware add-on for Microsoft Flight Simulator X designed by AFS-design, with principal development and creative work by Andreas Meyer. This remarkable package showcases a single-seat Mach 2-class Soviet-era fighter jet, originally crafted by the Sukhoi Design Bureau. Widely referred to by its NATO reporting name “Flanker,” it is recognized for its potent turbofan engines, large airframe, and robust aerodynamic capabilities, including the option of performing the famous Cobra maneuver.

Distinctive Exterior Form and Internal Structure

The Su-27 shares some aerodynamic features with the MiG-29 but is notably larger. Its integrated wing-fuselage layout includes leading-edge extensions that effectively form a cropped-delta wing. However, the aircraft still uses tailplanes, twin vertical stabilizers located outboard of the engines, and fold-down ventral fins that help maintain lateral control. A relatively high percentage of titanium—estimated at around 30%—contributes to the fuselage’s structural integrity without reliance on composite materials. The result is a strong but agile frame with advanced wingtip mounting for missiles or ECM pods.

Engine and Intake Configuration

AFS-design’s rendition captures the Su-27’s unique engine arrangement, where the Lyulka AL-31F turbofan powerplants are positioned with enough separation to optimize airflow, even under demanding operational conditions. This spaced layout also augments lift performance and helps minimize wing loading. For high-speed flight, the jet’s intakes feature movable guide vanes that accommodate Mach 2+ cruising ability, and mesh screens shield the intakes during ground roll to prevent foreign object ingestion.

Flight Controls and Maneuverability

A cornerstone of the Su-27’s agility is its fly-by-wire system, one of the earliest examples to reach frontline service within the Soviet Union. In conjunction with powerful control surfaces and a relatively light wing loading, the aircraft excels at both high angles of attack and very low speeds. Demonstrations of its high-alpha handling are famously showcased with maneuvers such as Pugachev’s Cobra, where the jet achieves a brief but dramatic nose-up posture with exceptional stability.

Avionics and Integrated Systems

The avionics suite includes an OLS-27 infrared search and track (IRST) device located just forward of the cockpit, which can detect targets at distances up to 80–100 km. This IRST can be used with the onboard radar or in a stealthy standalone mode, linked to infrared-guided missiles like the R-27T/ET or R-73. Additionally, a laser rangefinder improves the accuracy of cannon engagements by providing precise targeting coordinates.

Weapon Loadouts and Defensive Capabilities

Armed with a 30 mm GSh-30-1 cannon (situated near the starboard wingroot) and a maximum of 10 hardpoints, the Su-27 offers flexible loadout configurations. Typical missiles include the short-range R-73 and medium-range R-27 families, while advanced variants can integrate the R-77 for expanded engagement envelopes. The fighter is furnished with a robust high-contrast HUD alongside a helmet-mounted sight, formidable tools in close-range aerial combat.

Key Performance Figures

Manufacturer

Sukhoi Design Bureau

Crew

1 or 2

Dimensions

Length: 21.9 m, Wingspan: 14.7 m, Height: 5.92 m

Wing Area

62 m²

Engine

2 × Saturn/Lyulka AL-31F producing 122.8 kN each

Maximum Speed

Mach 2.35 (approx. 2,500 km/h)

Range

3,530 km at altitude

Service Ceiling

18,500 m

Weaponry

A single 30 mm GSh-30-1 cannon plus various air-to-air missiles

Highlights of the AFS-Design Package

This detailed add-on presents multiple Su-27 variants, including single-seat, dual-seat, and a four-aircraft formation model. The exterior and interior modeling feature high-resolution textures with refined reflective surfaces and dynamic light effects. There are extended animations such as canopy movement, spring-system landing gear operation, and functional control surfaces for flaps, spoilers, and airbrakes.

• Animations include boarding steps, brake parachute deployment (activated only on touchdown), and radome opening.
• A complete virtual cockpit with fully operational gauges, autopilot, and radio-navigation tools.
• Realistic flight dynamics, offering different trim settings that emulate authentic Su-27 handling.
• Engine simulation with thrust reverser and afterburner visuals.

There are 45 individual paint schemes, representing operators such as China, India, Russia, Poland, Kazakhstan, Eritrea, and Ethiopia. Re-painters will find an included repaint texture set for further customization. AFS-design has also provided formation flight models for those who want to simulate multi-jet demonstrations.

Installation and Configuration Notes

After unzipping the contents to a temporary folder, run Su27_demo.exe and follow the on-screen instructions. Once installation completes, launch Microsoft Flight Simulator X, select your Su-27 variant, and begin the simulation. To ensure compatibility, disable the DirectX 10 preview in the graphics settings. After making these adjustments, restart the simulator.

Default in-simulator commands include:

• F5, F6, F7, F8: Changes in formation flight
• # (touchdown only): Deploy brake parachute
• Shift + E: Opens boarding steps and radome

For optimal realism, confirm that DirectX 9 is active and that any DirectX 10 features remain disabled. This ensures proper rendering and animation behavior throughout the add-on.

All models, panels, sounds, textures, gauges, and animations in this freeware add-on were created by Andreas Meyer, Germany. AFS-design brings an impressive interpretation of the Su-27 to the virtual skies, delivering an immersive experience that highlights the fighter’s agility, engine performance, and advanced avionics.