So now, we can finally say that we have good propwash speed AND SWIRL over the tails of those tail-draggers! (And all other planes with engines in the front blowing propwash on the tail!)Īlso, propwash now spirals in FRONT of the prop when in reverse! Good find for the person that reported this bug!Īlso, propwash now tuned a bit more to follow the orientation of the prop, as we have found to be the case both with tail-draggers doing take-offs and the BackFly e-VTOL, which runs its’ wing in propwash without stalling, as long as there is propwash over them, proving that the flow is aligned to the props as long as power is put into the flow. This is good for tail-dragger and other handling where swirl angles over the tail matter. So X-Plane now tracks experimental data very very very well in propwash swirl! So this is a very nice start with analytical conservation of energy to DETERMINE the swirl, then using empirical data to apply that swirl at the right places in the prop stream tube. Now, X-Plane uses the efficiency and drag of the prop to estimate the swirl angle using conservation of energy, and then applying that swirl angle at all prop radial locations according experimental data, and holding that swirl as you move aft in the prop stream tube as per experimental data. In reality, the SWIRL ANGLE does NOT change with propwash speed or longitudinal location along the propwash stream tube, so tracking this swirl ANGLE in X-Plane instead of swirl SPEED gives us the most accurate propwash swirl in all locations, no matter how far behind the prop. The insight here was to NOT track propwash swirl in meters per second, but instead track it in degrees of swirl from straight aft! Now we have thew swirl angles at all radial distributions dialed in! Some of this wake turbulence tech comes from Xavion, where I developed it to avoid (another) wake-turbulence hit in the real airplane.īetter propwash swirl based on 4 different tech reports! Wake turbulence, better to track other planes!Ĭommand-m to see wake turbulence from your plane and others when in flight.ģ-D per-plane wake turbulence following wind and settling profile! We find it to be about 0.10 for the PT-6 turbines, and is almost certainly very close to 0 for any reciprocating engine. TURBINE AND RECIP EXHAUST HORSEPOWER TO POUNDS OF THRUSTĮnter how many pounds of thrust the exhaust puts out per horsepower output of the engine. Now we have EXHAUST THRUST as well for the turbines and recips! So while the metar or real weather or other weather setting sets the wind at 10 meters (the wind sock height), the profile from that down to the ground (by definition 0 for the atoms touching the pavement, and a curve in between) follows the wind turbine wind profile model This is from data on wind above ground carefully compiled for wind turbines!!! Har! New wind PROFILE from wind sock to ground So the glider raises a wing in the edge of a thermal. Thermals for gliders are found per element now, Which is cool and causes a little bit of settle as you start to get going before ETL. Rotor bouce back in ground effect now modulated by forward speed. This really drops a wing more in the stall! Stall is now TRIPPED and you really have to lower the nose to recover the non-separated flow, as per reality.
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