X Plane 11.40

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X-Plane 11.40 is Final Posted November 9, 2019 X-Plane 11.40 is now final! You will be prompted to update to X-Plane 11.40 when you start X-Plane; Steam users will. Go to austinmeyer.com for install details the installer will say 11.40b1 and this is normal since this is the first public beta. If you live in the usa and n.


August 24, 2019

In a video published today by Michael Brown of Laminar Research starring himself and Austin Meyer, details on what X-Plane 11.40 is to include were shown.

X-Plane 11.40 is to exclusively feature flight model improvements, from the much-needed based on user feedback to lesser-known effects.

The full video can be watched in full below. It is almost 45 minutes long, but if you'd rather read it in person, scroll down a bit further.


He is, however, accepting a limited number of applications from members of the public for alpha testing for people who watch the video, details of which were stated in the first part of the video.

11.40 is all about the flight model. Since its inception, Austin has continuously built upon the Blade Element Theory of X-Plane to make the handling of the aircraft as realistic as possible.

In today's video, he went through nine key areas of the flight model that will be addressed in X-Plane 11.40, as displayed on the whiteboard behind him. He also made further comments about the recently-announced Microsoft Flight Simulator, before going off on a tangent about the car manufacturer Tesla.

Starting with the top-left, Austin noted how the exhaust thrust can contribute a significant proportion of a plane's propulsion. For a Pratt & Whitney PT6, this was said to be as much as 10%. X-Plane 11.40 will be able to incorporate the exhaust propulsion through Plane Maker.

Also detailed was the wake turbulence. Already implemented, Austin has built upon it in 11.40 to leave 'little breadcrumbs' that can move with the wind. Each wingtip will now produce turbulence individually and can be viewed using the view flight model feature, through Ctrl and M or Cmd + M, depending on the operating system.

Next up is the change in the angle of air velocity. It concerns being able to track the velocity of a prop and finding the force as a result of the velocity.

11.40 will do a better job of having the propwash move away from the propeller mostly perpendicularly but tilt back over time and space and have the air move more with the local airflow as indicated by the arrows.

It applies to VTOLs as shown, but taildraggers will also benefit considerably from this, particularly during takeoff and landing, as the air moves with the wind behind the propeller.

A propeller will not only move air backwards but also in a spiral due to drag.

In 11.40, Austin wanted to know “how much does the propeller drag the air around in a spiral?” and listed three ways of calculating this:

  1. Look at the lift over drag ratio of the propeller. He gave the example that for every 10 knots of air moving backwards, there could be 1 knot caused by drag that acts as the spiral component.
  2. Calculating the amount of spiral wash based on propulsive efficiency. Another example he offered, was an 80% efficient engine having roughly 20% go “to the rotational wash of the stream,” based on Newton's third law of motion.
  3. Looking up NACA tech reports from World War II and compare his theory with those derived from actual flight models and tests.

He said this matters because the prop wash will hit the horizontal stabiliser.

The fourth point was the phenomenon of wash across a propeller disc. Air at the back of a disc relative to the direction of travel has had more time to accelerate over the whole disc, and is where the velocity of the air passing through the blades is the greatest, as shown by the lines closer together in the diagram.

Moreover, Austin said he tested this on Beta Technologies' Ava he is helping with, an eVTOL: as it sped up going forwards, it started to tilt back. Analysis of the data revealed a very close result with his original prediction.

On the right of the whiteboard, is delayed wash. This is simply the time it takes for air leaving the main wing to hit the tail wings, and results in an increasing tendency to pitch upwards as a result.

Whilst X-Plane has been able to simulate downwash, resulting in the opposing force of lift from the main wing, on the tail wings, it has never taken into consideration the time it takes.

11.40 now approximately works out this delay based on airspeed and the change in pitch per unit time that air moves from the main wing to the rear wings. Austin noted it would be too taxing on performance to simulate airflow more realistically to calculate a more exact time.

As shown on the right, end-plates/wingtip devices were also talked about. Specifically, Austin explained how they work, and why they matter in flight.

What changes in 11.40 is the fact that the T-tail of an aircraft has been treated as a massive end-plate all this time, but this is no longer the case in the new update. Now, the vertical tail component of an empennage is no longer being treated as an end-plate and was described as more of a bug fix.

Next in his flight model improvements, is the area rule. He described the phenomenon that at supersonic speeds, air is compressed in front of the leading edge of a wing that induces drag. But by thinning the fuselage at the root of a wing, air is allowed to flow near the fuselage and ease the pressure at the front of the wing.

X Plane 11.40r2

The benefit of this is that as the area of the wing is made larger, the cross-sectional area of the aircraft doesn't change, therefore reducing drag.

The area rule has been improved in 11.40 and can be defined in Plane Maker.

The last but one item is sea wave shape. Up until now, X-Plane has modelled sea waves as a sine curve, but the reality is that the peaks are usually much sharper.

Thus, Austin says that the peaks contain less water volume, making physics on water smoother and less harmonic. “[A] seaplane should handle a decent bit nicer on the waves.”

Finally, the change in the coefficient of lift of a wing is to change due to the changing angle of an aileron. This is based on an average number of NACA teach reports Austin used.
Following on from detailing the flight model, Austin briefly discussed Microsoft Flight Simulator. He said he has a gut feeling it will be 'amazing.'

But he mentioned that it will have no impact on him, like how X-Plane was able to coexist with other Microsoft flight simulators since 1995. He said X-Plane was originally based on the mathematics and physics behind the flight model, and that is how it will continue going forward.


Austin expects there to be no further major changes to the flight model, only minor ones. These will all be available only with the experimental flight model box checked in settings.

Finally, at 38:23, Austin spoke unrelatedly about how great Tesla is, but highlighted a key problem with the oil industry and car dealerships in South Carolina.

X-Plane 11.36 is expected to go live very soon with a couple of very minor tweaks to the simulator.
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November 8, 2019

The next large update to Laminar Research's X-Plane is upon us, with the release of 11.40. While not quite as big as 11.30, today's update brings with it many behind the scenes changes - namely to the flight model.

This is due to creator Austin Meyer's added experience with real-world planes following flight testing of his own plane: Ava, an aircraft modelled almost entirely in X-Plane's Plane Maker. To learn more about Ava, check out an article spotlight on the VTOL craft.

11.40 began it's public beta life in early September, and has since seen 10 incremental versions up until 11.40r2, which dropped today.

The changelog for this update is extensive - it's available in list form below.

Release Candidate 2

  • XPD-10325 APU N1 is saved for replay using the correct scale now.
  • XPD-10366 Fixed crash when tracking to YMUL GNSS RW23 MULEH.
  • XPD-10369 G1000 MFD track-up route leg plotting error.

Release Candidate 1

  • New datarefs:
  • XPD-10269 GPU time for debugging.
  • XPD-10347 Wing stalls.
  • XPD-10350 Access to 3-d proj matrix from 2-d UI call.
  • Tweaks to AI landings & interaction with ATC.
  • XPD-8169 DELTA and ABS DELTA replay properly in .snd files.
  • XPD-8754 Replay recreates wheel impact sounds.
  • XPD-10225 Critical altitude for electric motors.
  • XPD-10325 Replay recreates APU N1 for sound.

Beta 9

X-plane 11.40 For Sale

  • Body shadowing code improvements for speed with high numbers of FM iterations
  • X-Plane uses the right reynolds numbers for airfoils even if the order is entered backward in the .afl file.
  • XPD-10058 Added a link to the complete Gateway contributors list.
  • XPD-10342 The same IP and port must not mean the same app.
  • XPD-10349 Instanced objects go nuts when sim is paused.
  • XPD-10352 Stall speed fixed when experimental FM is off.
  • XPD-10354 Fixed NaN crash with AB412 Helicopter, when using zero size weapons.
  • XPD-10355 Fixed override_engines to not double engine forces.

Beta 8

  • Minor German text fixes.
  • NaN fixes.

Beta 7

  • Better AI airliner landings.
  • XPD-10320 Fixed nosewheel steering with experimental FM on.
  • XPD-10333 We now log if the experimental FM is turned on or off.
  • XPD-10336 S-76 torque number fix.
  • XPD-10338 Fixed afterburner thrust for pre-11.40 aircraft.

Beta 6

  • New feature: authors can specify preferred climb speed for AI aircraft use.
  • SF-50 trim settings tweaked by Austin.
  • Fixed buildings missing at KSEA & LOWI.
  • Fixed local date being wrong when it’s past midnight GMT but early evening locally and track system date and time is in use.
  • Fixed crash at KSAV if trying to contact tower.
  • New log messages for bad ATC Frequencies that are in the navaid freq range.
  • Autostall recovery tweaked a bit.
  • Adjustments to how AI aircraft climb, hold altitude and fly final approach to TDZ.
  • XPD-10313 S76 Radio Altimeter Error.
  • XPD-10326 Fixed engine override dataref.

Beta 5

  • Latest Gateway airports added.
  • Fix for flight model crashes.
  • AI tuning & push back truck force adjusted.
  • XPD-10321 Bleed air commands doesn’t modify bleed mode.

Beta 4

  • XPD-9793 Save all random seeds in sit/rep, not just wxr.
  • XPD-10294 FM fixes for vortex ring state.
  • XPD-10307 Fixed propwash swirl.
  • XPD-10309 FM fixes for for helicopter (VRS/Wash).
  • XPD-10310 Fixed GPS error when course is < 360 as double, but not < 360 as float.
  • XPD-10311 Fixed missing decals on desktop.

X Plane 11.40 Crack

Beta 3

  • Weather & time fixes to .sit & .rep files.
  • G1000 now displays “LOADING”, just like the real one does when it re-projects the map.
  • XPD-8560 Carrier ILS frequencies off unless using military plane or helicopter, carrier approach, or auto tune radios.
  • XPD-10256 GPS OBS is now decoupled from OBS in VLOC mode.
  • XPD-10278 Fixed missing headers in data output.
  • XPD-10290 Melding of approaches and transitions works again.
  • XPD-10293 External visual weather or time not synced with master.
  • XPD-10295, XPD-10296 Fixed wind “calm zone” being to high.
  • XPD-10298 Restored custom “master caution” from plugins.

Beta 2

  • Updated joystick configs & manuals.
  • Updated code signing for upcoming macOS Catalina.
  • XPD-7964 Fixed weapon view.
  • XPD-9083 Fix the map around the international date line.
  • XPD-10240, XPD-10291 Fixed bug where blank named roads would always be treated
  • as one way.
  • XPD-10273 Restored aliases for old command names.
  • XPD-10289 Wake turbulence makes light aircraft explode.

Beta 1

  • XPD-8518 Incorrect metar QNH interpretation (/// entries).
  • XPD-9659 Propwash flow in reverse incorrectly swirls behind the prop disk and flows ‘straight’ after the prop disk
  • XPD-9872 Ground trucks slow to a crawl when passing on the same network segment.
  • XPD-9984 Update UI to indicate GPS commands work with G530.
  • XPD-9969 Make oil temperature datarefs editable.
  • XPD-10003 In some planes turning on and off the Landing lights has no effect on battery amperage draw.
  • XPD-10005 Area-ruled correction factor added to Plane Maker.
  • XPD-10017 Removed duplicate DRM alert.
  • XPD-10199 Wetted area in cycle dump documentation updated.
  • XPD-10227 Updated docs for sim/flightmodel2/controls/left & right_brake_ratio.

To update, simply re-run the X-Plane 11 Installer. For Steam users, the application will auto-update for you.

The Laminar team recently presented at Flight Sim Show 2019, which took place at RAF Cosford. To see our full recap from the presentation, check out our article here.

X-plane 11.40 Flight Model Youtube

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X Plane 11.40 Release Notes

Threshold encourages informed discussion and debate - though this can only happen if all commenters remain civil when voicing their opinions.

Please enable JavaScript to view the comments powered by Disqus.

X Plane 11.40 Fps

© 2018 - 2021 Threshold AS
All rights reserved.