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Sitten on toki joukko ihmisiä, jotka tuntuvat suunnitelevan lentokoneita X-plane lentosimulaattorilla. Kun on tullut tutustuttua hieman tuohon aerodynamiikkaan, lentokoneen mitoitukseen ja hieman on päässyt jyvälle myös siitä miten X-plane mallintaa koneet, voin sanoa että minä en lentäisi sellaisella koneella, joka on suunniteltu X-planella....Koneen Cd0-arvokin annetaan manuaalisesti, ja toisin kuin monet tuntuvat luulevan, softa ei mallinna vastusta rungon muodosta. Samaten tuntuu olevan yleinen käsitys että softa tekisi "CFD-analyysiä lennossa", ei pidä sekään paikkaansa. Profiilista on yksi epätarkka painejakaumakäyrä esimallinnettu, ja softa käyttää siitä taulukoituja arvoja. Ja kuten arvata saattaa, kyseessä on vaan yksi tapaus yhdellä Reynolds numberilla.
Just keep in mind the discussion we had some time ago regarding X-plane. It is a game designed for the casual or amateur designer. Yes, it does have viable math behind it but there's much it cannot and will not tell you, especially near the edges of your flight envelope or areas where the airplane is outside the normal cruise flight attitude. And last time i looked, it also has no numerical output so cannot provide you with coefficients, which are of course the only meaningful bit of information that you can base design evaluations on. But it will provide you with a bit of qualitative information within the cruise, take-off and landing parts of your flight envelope so you'll at least get an idea of how your plane might fly once you get it in the air.
IMHO X-plane version 7 is the best one for simulation like you are looking for. Later versions started getting more cluttered up for the gamer market. Other than some things like tire friction coefficients the newer versions don't do anything better than the older versions. Load time is much quicker with the old ones as well.If you keep in mind the programs limitations and spend the time to accurately setup the parameters it can be a very good tool. You're not going to get hard real world numbers but it will let you know quickly if you have any serious problems. It also gives good feed back on little changes such as 2 more inches of prop diameter or another 1/2 degree of wing wash out. Again, not numbers that you can directly relate to the real world, but the magnitude of the trends is close.