January 5, 2017 New flight-modeling stuff done recently for 11.00: Thanks to a few hundred hours of flight experience in my Lancair Evolution so far, I am really improving the flight model in X-Plane in the area of PT-6 engines, electrical, and pressurization systems! And, while in the systems code, I’ve improved a lot of other systems simulations as well, which is always fun. So, here is the new stuff done for 11.00 so far in the flight and systems modeling area! PT-6 engine modeling: Thanks to LOTS OF FLIGHT-test IN N844X, which has a PT6, I am getting that engine just right in X-Plane! I got the RECIP engine performance dialed in when flying recip engine airplanes like the Cirrus SR-22 and Columbia-400, and now I’m dialing in the TURBOPROP performance now that I’m flying a turboprop!

Not only are the fuel flow and efficiency now correct. But the engine just FEELS right. But how does an engine FEEL right in a simulator? How does that make any sense? Well, the PT-6 engine has a distinct feel to it to operate.

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That engine is all about having enough AIRFLOW moving through it to balance the FUEL FLOW to keep the temperatures under control. The turbine is slow to respond at low power settings, since not enough air is racing through to rapidly change the turbine speed. The turbine feels HEAVY to slow-moving air with little dynamic pressure, so the turbine is at first sluggish, slow to spin up!

But as the speed picks up and the airflow with it, the turbine seems comparatively lighter compared to the airflow moving through it and responds much more quickly! So, adding fuel from a low power setting, temperatures spike as you add fuel at low turbine rpm, and cool as the turbine spins up.

The turbine sound is one sound and feel, the prop completely another since there is no connection between the turbine and prop! Only air between turbines connects the prop to the rest of the engine! So a PT-6 engine has a real feel and response in turbine RPM, torque, fuel flow and temperature over time as you adjust the throttle, prop, and idle lever at different altitudes and temperatures, always spinning up or down at varying speeds and temperatures as the fuel and air moving through it change. It is really very Steam-Punk in its’ operation. Now, TECHNICALLY described improvemens for X-Plane 11: Much better engine ITT modeling for those turboprops, including response speeds on power, prop, or condition lever changes. Better torque and fuel flow modeling as well. The dynamic pressure through the power turbine across varying rpm ranges controls you can exchanging torque and rpm to get the same power, for accurate cruise performance as you dial back the prop rpm but hold constant fuel flow, and glide with the prop feathered or not as well.

The new turbine model includes, by the way, compressor stalls, which I have gone through first-hand! As well, I have done a lot of engine failure simulation tuning for hot start, ITT runway, compressor stalls and the like. Crash bandicoot wrath of cortex gamecube iso.

As well, the turbine idle is now floating point like everything in a real PT-6. Move the red knob to move smoothly from low to idle, or hold it partway if you want to keep the engine temps JUST where you want, as you would in reality. Just remember to tweak those idle speeds in Plane-Maker now to get your idles just right! For turbines, you will want to enter a higher high idle than low idle now X-Plane does not do this for you any more, since you can now tune those fuel flows at idle as you like for yourself!

At low idle, you need to be above 52% Ng for PT6 engines. At high idle, you want to be higher the King Airs like to spin about 70% Ng to have enough speed to turn their air conditioner compressors! The shop adjusts the idle stop points per-engine, per-aircraft, based on pilot or company desires. I like my idle speeds a bit low in 844X so the plane taxis almost like it was carefully designed, and not trying to race away by taxiing at 50 knots! So the low and high idle adjusts, set in engine window of PLANE-MAKER, should be set according to how your airplane is dialed in in reality. First 20 elements of the periodic table song download. For a king air you prolly want 55% Ng for low idle, 70% for high idle, which work out to about: HI idle: 1.70 LO idle: 1.00 in Plane-Maker. In other words, our low idle is just enough to run the engine at the lowest Ng recommend, and we bump that up by 70% at high idle to spin the generators and air conditioning compressors.