Update: REP 5.0 for the SIAI-Marchetti SF.260

The SIAI-Marchetti SF.260 is one of the most iconic light aircraft ever built. Known as the “Ferrari of the sky,” it was designed by Stelio Frati in the 1960s and went on to become a staple of military pilot training worldwide — including with the Italian and Belgian Air Forces. Today, we’re happy to announce that REP 5.0.4 is now available for the JRollon SF.260 and for all the other REPs that already received the REP 5.0 update in the past.

This is the first time the SF.260 receives REP 5.0. Therefore, this update is a significant step forward for the package.

How to Update

This update is free for all existing users. You can download it using the SkunkCrafts Updater, or re-download the full installation package from the X-Plane.org Store and reinstall from scratch.

REP 5.0: What Changes Under the Hood

Since REP 2.0, all piston engines in our packages use a fully custom engine model that replaces X-Plane’s default engine entirely. REP does not tweak the simulator’s engine — it removes it and rebuilds it from scratch. Every cylinder is simulated individually. Temperatures, combustion, power output, vibrations, and wear all come from the model itself.

REP 5.0 refines this foundation further with significantly improved per-cylinder data and a new electrical and alternator model. The new electrical system eliminates several long-standing quirks caused by X-Plane’s internal electrical overrides.

The SF.260 comes in two variants: the civilian version, powered by a carbureted Lycoming O-540, and the military version with the fuel-injected IO-540. We model both engines according to their real-world specifications — including the full Bendix RSA fuel injection system on the military variant, and realistic carburetor dynamics and icing behavior on the civilian one.

A Feature-Rich Package

SF.260 I-LELM flying over northern Italy.

The SF.260 with REP has always been one of the most complete packages in our lineup. Here’s a recap of what’s included.

Engine & Systems

The engine truly breathes air, mixes it with fuel, and produces power through a physically coherent combustion process. Nothing is scripted or precomputed.

Per-cylinder simulation: CHT, EGT, compression, power output, vibrations — all from the model
Carbureted O-540 with realistic icing behavior (civilian), or Bendix RSA injected IO-540 (military)
Full oil system: viscosity, temperature, filter wear, pump condition
Spark plug fouling, engine preheater, vacuum system, and more
Every cockpit light has its own load on the alternator — electrical management matters
All circuit breakers are fully functional, each controlling the exact system labeled next to it in the cockpit

Avionics

We built our custom avionics to work exactly as described in the real aircraft manuals — not as approximations.

Custom Bendix/King KX165A Nav/Com, KR87 ADF, and KFC225 autopilot — all functions implemented
Custom Garmin GTX330 transponder with all modes, including altitude monitor, count-up/down timers, OAT/DALT, and flight time
GNS430 support, RealityXP GTN650/750 support
If an instrument needle gets stuck, you can tap on it with the mouse — just like the real thing. Worn-out avionics can be serviced in the Maintenance Report.

Cockpit & Configuration

The SF.260 was designed as a military trainer, so the normal PIC position is the right seat. Our package lets you choose: right seat or left seat, and the instrument panel adapts accordingly.
Three cockpit layouts available: Civilian Analog, Military Analog, and Civilian G1000
All cockpit lights use custom REP-driven illumination — they can fail and wear over time, each carrying their own electrical load on the alternator

Systems & Procedures

The flaps are continuous and can be set to any angle between 0° and 50°. At flight speeds, aerodynamic forces act on the flap surfaces, so the actual deflection is slightly less than the commanded position — exactly as in the real aircraft.
Emergency landing gear extension is fully simulated. If the hydraulic system fails, you crank the manual handle located between the seats — about 27 turns — just like the real procedure.
Complete walkaround and pre-flight inspection before every flight

Persistence & Wear

Full wear and tear across engine, avionics, landing gear, instruments, and more
Damage is cumulative and saved between sessions — each livery has its own state
Battery discharges in real time, even when X-Plane is closed

What’s changed in 5.0.4

SF.260 Fix: The amperometer appeared twice in the indicators list in the hangar window
SF.260 Fix: The HSI gyro could enter free mode even when properly powered, causing heading misalignment
SF.260 Fix: The GTX330 transponder could crash X-Plane when double-clicking the FUNC button
SF.260 Fix: Cockpit lights glow now works correctly in X-Plane 12+
SF.260 Fix: GNS430 background graphics could appear corrupted on certain systems
SF.260 Improvement: New engine sounds

Other REP planes:

Thrada Beaver XP12 Fix: REP’s fuel tool may overwrite the payload set with Thranda’s mass and balance tool
Cessna 172 Fix: The fuel pump sound was not played anymore in latest X-Plane 12 versions
Cirrus SR22 Fix: Fixed fuel tanks size
All B58 Baron Improvement: Slightly tuned EGT curve
PAE G36 Fix: on some systems, the G1000 text font may be partially corrupted.