The Engine’s Logic

The Reality Expansion Pack features the most complex piston engine logic ever experienced in X‑Plane. It is 100% custom. It does not rely on internal X-Plane dynamics.

This big improvement is available for all the aircraft targeted by REP.

Why? Because a custom logic works to simulate all the different components you find in a real engine.

The code inside REP recreates the behavior of the pistons, the cylinders, the oil, the fuel lines, the injectors, the battery, the cowl flaps, the spark plugs and all the other little things that make an engine alive.

The result is that you need to proper manage the engine. If you don’t, the engine will revolt against you, leaving you alone just when you need it more.

In fact, you have to follow the proper procedures to start it up, to warm it up and to fly it in the sky.

Just like the real thing, the engine wears out one flight after another. If you do not take care of it, such replacing the oil when necessary, it will die on you one day or another.

The engine logic is being enhanced with every upgrade. That is, with every upgrade you get more things to care about and more stuff to learn when in flight.

The Features

This is the list of things that REP is able to simulate within X-Plane:

  1. Proper procedures for pre-heating, priming and startup
  2. Realistic engine spoolup and “roar” at startup
  3. Starter overheat and wear
  4. Turbo automatic waste gate (C210 only)
  5. Turbo lag (C210 only)
  6. Correct engine torque
  7. Correct power output at every regime/setting
  8. LOP and ROP operations
  9. Spark plugs fouling
  10. Interchangeable spark plugs between default and fine-wire
  11. Correct cowl flaps drag
  12. Realistic engine vibrations (needs HeadShake)
  13. Cylinders compression
  14. Cylinders cracking and seizure caused by improper engine management, such running at high rpms when the CHT is still too low
  15. Propeller movements at low speed caused by the cylinders compression
  16. Fuel filter clogging
  17. Fuel vapor in the fuel lines that may prevent a startup
  18. The “popping” and “sputting” sounds of a big bore engine
  19. Oil viscosity at different temperatures
  20. Different oil types (SAE10W30, SAE30, SAE50) that can be replaced in the hangar
  21. Oil filter clogging
  22. Wearing of the oil fluid
  23. Oil pump failures
  24. Vacuum pumps failures
  25. Electric pre-heating
  26. Winterization kit

The Behavior

Did you know that X-Plane’s default piston engine is not as good as you may have tought when it comes to simulate a specific engine model? That is because it is designed to “just fit” every kind of airplane.

It means that it’s made out of compromises to be “good enough” under every operating condition. That is, it’s not “realistic enough” if used to simulate a specific engine model.

This is where REP enters the game.

Every engine simulated by REP is so realistic that it has its own behavior. Something that you won’t find in the default X-Plane engine.

REP’s engines can starve on fuel vapors or be flooded by the fuel itself if not managed correctly.

Every engine outputs the correct HP at every regime setting. You will get the correct fuel consumption and thrust under any operating condition.

You have to correctly prime the engine before startup, depending on the cylinders temperature.

Did we mention that REP features an electrical engine pre-heater that helps you to start the engine on winter?And what would you say of the propeller animations? Check them out in the video below.