I’ve combined data from a number of NACA tech-reports, and confirmed them as follows:įlight-test on the Boeing 707 in the 60’s showed that the reduced downwash over the tail due to ground-effect threw the nose down about 2.5 degrees if you never flared. Rather than just applying wash behind the disc, we now ACCELERATE the air leading up to the disc over a distance, then ACCELERATE it behind the disc over a distance, as happens in reality! This increase in propwash speed over distance is modeled after charts showing inflow of air into the prop disc, watching the air accelerate as it is pulled into the disc, and pressurized to continue speeding up behind the disc! Hit the control-m key a few times while looking at a propeller airplane at full thrust and not moving (or slowly moving) to really see this effect. Root AOA, tip AOA, and power to interpolate: Now in addition to the helix-angle prop-twist, we add some AOA to the blades to get us to the optimal AOA for the airfoil… with some washout near the tip to reduce induced drag if desired.Īnd in X-Plane, the propwash is now much nicer: It’s in the engine screen, prop tabs:Įllipse ratio: Enter a value of 1.0, or approaching 1.0, to get elliptical props for more efficiency… X-Plane will take the Oswalds efficiency to 1.0 as the ellipse ratio goes to 1.0. Now in Plane Maker, engines screen, you will notice some really cool new stuff. Propeller and propwash modeling improvements: You will see that the drag is initially higher than in previous versions of X-Plane.Īs well as the more accurate wing forces post-stall, in Plane Maker we also draw little spheres where the wings connect, so you can see where you have (or don’t) connected wings in Plane Maker. So, for third-party aircraft-makers, do a batch-convert on your airfoils in Airfoil Maker, and then re-test any post-stall flight that you want to. (BUT BE WARNED: IF THIRD-PARTY ACFT MAKERS HAVE TWEAKED THEIR AFLS TO BE JUST PERFECT FOR THEIR PLANES, THEN THOSE MODS WILL BE OVER-WRITTEN!) NOTE: This is NOT a change to X-Plane! It is a change to Airfoil Maker and the airfoil files that we distribute! If you want to realize this new accuracy in your personal or third-party aircraft, then fire up Airfoil Maker and do the batch-update to update all of your airfoils. This new improvement makes ZERO difference when the wing is not stalled, but post-stall, the drag is now much more accurate. New drag coefficients in the airfoil files are now much more accurate POST-STALL. Now we find ground effect for each BIT of the helo rotor! This phases in the ground effect from front to back as we approach a tall helipad! Situation files get you close to landmarks for quick sight seeing.Settings UI for re-enabling notification windows that have a “don’t show this again” checkbox.New UI for manually setting joystick curves per axis.Updated joystick config files to use sim/autopilot/servos_off_any. ![]() ![]() Updated airspace to 2018 & Navigraph default data 1708.Shader system rebuilt as part of port to Vulkan.FM improvements / experimental FM UI option.Improved industrial zones in US autogen & reorganized library.XPD-9729 Contrails and wing condensation missing in replay.XPD-9501, XPD-9449 AMD driver bugs with displays & weapons.XPD-9388 Software hangs upon exit when using VR.
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