To those critical of Austin's "bounce-back" idea for helicopter ground effect, I would say this: remember this is a model, a simulation. Austin is looking for ways to model some rotocraft behaviours that can be reduced to code. Airflow in rotor systems is extremely complex (see RW Prouty's work on this). The mass airflow through the tail rotor also has an influence when airspeed is low. There's the shape of the fuselage to consider, articulation of the blades, texture of the gound, length of any grass; the direction and velocity of wind etc etc - it is impossibly difficult to model many different rotorcraft given the number of variables and so the problem has to be reduced and simplified. X-Plane gets better and better thanks to the inquisitve mind of its creator and his considerable skills. Bravo, I say! (I've been flying helicopters since 1988).

Xplane has been the most realistic flight sim for years. When I first tried it, all those tiny little motions that come from changing a power setting, adverse yaw, side slip etc, were just "wow" and that must have been 10+ years back now. Big thanks, from an xplane pilot!

Awesome videos man. I really like when Austin talks about xplane. I can see his passion. I am a software engineer and I appreciate being passionate about a project. May I suggest a talk about volkan and or SLI? Anyways, love the videos Austin!!! Keep them coming.

im loving all of this Austin activity

Geez Austin, pick on a student other than Michael for once. ;)

Hello Austin! My gratitude to your work is always present! About the thermals (being a glider pilot myself), yes, the model is pretty much the best of what you can choose in order to more accurately simulate the lift gradient on one wing, from where the resultant lift differential occurs, but..., for the sensitive data (implemented default thermal dynamics constants, such as intensity gradient versus thermal radius) cannot be easily determined by mind. Something that you've done very right and also fun was when you tried to re-ensure that there is a "magic" 25% chord position of an airfoil where about the pitching moment remains nearly unchanged for a given amount of alpha range (you know, when you've done that test with a symmetrical shape body blown by the wind on top of your car for some entertaining validation purpose). Perhaps the same way, you should try to place some vertical speed measuring anemometers at different heights above ground (to have a sort of "field of values" also distributed in the vertical) where a small dust devil or any other form of thermal activities take place, thus have the "Ahaa...!" values that you'll need. Yes, that can turn a bit into scientific tests, but ain't it nice? It would be useful (for us, the aerospace engineers) to become an Adam Savage (from "Mythbusters") yourself ;). Besides the thermal dynamics simulation that you're about to implement, it's really a must if you're about to implement the other physical simulations as well! Really, I hope you'll never get tired of improving this for all of us...! One day, sooner or later, people will have a great gratitude! We have no other hope than you for this cause! Regards!

I'm a flight Instructor for helicopters and I've never heard of rotor bounce-back. In-ground effect comes from the coanda effect, taking away the downwash to the sides, thus reducing induced flow(aka rotor tip vortices) In running landings we keep ETL while getting into in-ground effect. If IGE was only working when slower than ETL, this maneuver wouldn't work. So I don't see wind bouncing back up when inground effect. (If that was a thing we would have higher pressure while hovering compared to when taking off. And with our pitot static system we can see changes in pressure. And neither the altimeter nor the VSI is showing a change in pressure.

Yes, we know everyone wants seasons, Vulcan, Metal, clouds, and weather. But, Austin does the flight model. He does not do the aforementioned items.

I love how these guys are like a really cool university staff. No marketing, no bells and whistles. Just rock solid fundamentals.

My biggest wishes for upcoming and future flight models would be more realistic stall and especially spin characteristics and behavior (also aileron inversion at stall speed), and more realistic behavior of the airplanes in turbulence. Often it seems they bump around too quickly/jumpy and suddenly. I hope that you, Austin, will read this and will be able to implement these things at some time in the future! :)

Hey, having flown on the 172, I can say you're doing a nice job on trying to make x plane as real as possible

I did a test flight with B3 tonight in VR, and decided to do some barnstorming in the F-4. Wow, the new stall mechanic is definitely noticeable. I tried to pull a sharp maneuver over the mountains and didn't watch my airspeed. The plane suddenly rolled left and I became a passenger. Unfortunately I was too low to recover, but hey, it's a sim and we can do these things from the safety of our computer chairs! Keep up the good work Austin and LR! It was a crazy sensation to have that sudden moment of panic knowing I had lost control of the aircraft.

it's one thing to talk about the physics and dynamics of plane aerodynamics, it's another to translate that to code. This guys does both. Pretty incredible. Must have went to Purdue ;)

All I want to know, will there be an exam? Love it keep them coming.

I love watching Austin talk at 2x playback speed. His level of intensity just increases... =D

Austin you're a legend this is why I love X-plane it's the best decision I've ever made switching over to X-plane ! It just keeps getting better and better

Wow. What other company owner would put this much effort into his product! Austin, you've sold me on xplane. I've been using another sim, and have xplane, but couldnt commit to switching over. Great work, you've earned another loyal xplane customer. Thanks for your commitment 👍

Brett S is also very generous with his time helping people in the X-Plane forum.

Austin this is fascinating work! I cannot believe it took me 10 years to swop from FSX to XP.

I feel about the happiest man when I see "Austin at work" as he directly involves into more studying with the most important goal in mind, which from me, is his greatest role in life: making X-Plane's aerodynamics and flight dynamics physics less erroneous compared to reality! As an aerospace engineer, glider pilot and ex-aerodynamicist (calculated the test results from wind tunnel tests), I haven't seen anyone with a greater implication in this region alone then this man. It's like God knew who to choose for doing this simulator, so I truly appreciate him for that. Although, as I started watching the video with great interest, I've stopped a bit at around 7:07 for what seems to be, ehh..., probably a small confusion, but which I'm anyway certain that will be correctly implemented/worked in the X-Plane's equations code! Sorry and please correct me if I'm wrong, but it seems like you've made a confusion there between the vertical speed component reference and the resultant speed component reference when you've calculated the time it takes for the air particle to reach from the blade's height to the ground (Hh as you've named it). You've taken the Vw (that's the speed of the particle along it's path, not the vertical component) in the equation which is the hypotenuse component but using the vertical cathetus distance component, instead of the vertical component cathetus which should've logicall been used for that distance reference if you want to correctly determine the required time.

austin...make it simple...add a new box to installer for alpha builds, then make a new upgrade branch for alphas similar to how you differentiate release and beta branches...

I am so glad you work so hard to make the best flight sim ever, I see this as a valuable training aid.

Not only is the what, why, and how amazing in all these recent videos, but the interaction with the community is as well. Here lately anytime that notification goes off it is like yep, have to watch it.

Really happy with these changes! Especially the moment created by a thermal, because it is quite hard to find the position of your glider in a thermal right now.

This sort of coded physics floats my boat. I, as somone who digs flying choppers in X Plane, am very exiced to try and notice the difference with the new beta. Austin is the best sort of people.

If Austin drinks the Brazilian coffee would be much more electrical than the normal and won't be able to do this video.

Damn I feel bad for Michael, he has to take hard exams every video from Austin🤣

Really incredible how passionate you guys work on that sim. I really like using it whenever I can't fly IRL. One thing that would make me even happier would be a more accurate behavior in slip conditions like forward slip. I feel like the increase in vertical speed is not enough. Also the IAS should drop.

ANOTHER GREAT FREAKING VIDEO KEEP EM COMIN PLEEEAASEEE! #BESTDEVSEVERRRR

It almost seems as if you could now apply some machine learning to integrate some of these new effects into a more holistic model of the entire surface as a complete model. The ML could take data from actual sensors and integrate it into the X-plane model to trim these new effects against real world values. Now the question would be where to get this data to integrate and feed the ML system and build data from the new model. I hope I am making sense above. Also, voice simulation has come a long way from the stuttering audio offered currently.

One thing Austin did not mention about with the Helicopter Rotor Bounce Back, is that the winds can also move that disturbed air away from the column of air. Which would change the amount of power required. Hope that Brett tosses that one Austin's way.

Austin, with respect to your explanation of best climb rates for helicopters: I believe you can fine tune that rule of thumb of 5 time delta V by relating it to the diameter of the rotor. Considering the date of posting of your video, I expect you have likely already included this.

Excellent. Keep the updates coming. Two biggest immersion killers are taxiing ( planes feel like there is no weight to them) and sea planes operating on the water. A2A j3 cub on floats does best job so far out of all sims.

Love Austin's passion! Great presenter.

The air pushed down by helicopter rotors DOES NOT "bounce back" up into the rotors - someone please explain to me how air bounces off the ground and goes back up into the rotors while other air is simultaneously coming down from the rotors at the same time someone explain that to me! no.. air is a fluid and two fluids can't "flow through" eachother sorry

propeller efficiency at a standstill vs during take off roll (or in flight) and also helos hovering........ the difference in efficiency is due to the prop having to accelerate air from zero velocity versus air already approaching the blades

It is incredible all the improvements that are being made in x-plane, but I still wonder, it is planned to improve the physics of water eyes for seaplanes?!

My wife says I'm a nerd because of watching this.

if you've ever flown a Piper PA-20 series you know those things are the most gentle in a stall. They just start losing altitude until you correct pitch. :)

who busted the door stopp!!!?? :)

I'm so hyped for this new flight model. It fixes like all of the realism issues I've ever had with the old one.

why are we going to Austin's website for the beta? Why not deliver it like all the other updates?

Austin put some turbulence with origens in wave mountains and termic linked with the kind of ground,not necessary turbulence but wind,More interference the sorrounding,more live,like with the termic gradient...

I love how active you guys are with xplane. Just makes me want to stick with xplane even as new Sims come out.

Austins enthusiasm is so brilliant!

Looks like there are issues with the space shuttle. In 11.40 it goes uncontrollable but in 11.36 its fine.

Dude, did you just touched the whiteboard, like you were touching the screen for the next frame (4:56)? LOL>… Awesome man! Love the math. Keep it up!

On the second pic with a helicopter dT=2H/V as wind moves back and forth to the disk.

Nice stuff Austin, be great if the sound of props couldn’t follow some of the math you have done. I have heard piston aircraft taking off from cockpits and there is a difference in tone between the prop under full acceleration standing still then starting to roll, compared to when the aircraft is travelling at rotation speed. I have heard this in a Beech 18, one great aircraft..

Love these videos, it’s clear Austin is really passionate about developing X-Plane. Wonder if there’s any update on Vulcan though?

Can we fix Michael's audio? not being critical, just would like to hear those great questions coming in.

can you imagine this guy drunk?? lol

I've seen your videos on controllers etcetera but can you do a video on what you would consider to be the most realistic from yoke to pedals to levers etcetera. Essentially put a setup together that you would stamp your name on for a student pilot to use.

“Coming at cha from Mikes playhouse...” oh boy.

Hi Guys, loving the videos, thank you so much I have been with X-Plane from the start and now my sons are enjoying all your hard work too, we will be going to the Flight Sim Show at RAF Cosford and wondered who will be coming from X-Plane this year please?

Installed this new update (i installed the previous 11.40 beta 1 before and it worked). With this one, Xplane directly crashes when launching. XP-11 on Macbook pro

I would only use programs that has an out of box price not a monthly or yearly fee. Too many free editors that are free or one time fee that are excellent

First of all, thx Austin for your amazing work on the new flight model. But I have to say, this little checkbox in the settings does no justice to this great new feature. It should be an option on a per plane basis so it can be easily be used with updated planes which already have support for the new flight model, while older once can use the (lets call it) legacy flight model. For me as a user having to switch back an forth in the settings as I use different planes is less than ideal.

You should make a webinar to answer questions from developers, greetings

Better Thermals! That are outstanding news for us glider jockeys! It seems I don't have to switch to Condor-2 to get a good glider simulation :-) Please could you take care of the math which is calculating the take off by winch? The ASK 21 is not instantaneous airborne, the plane is rolling 10+ meters before it lifts and the speed at the highest point is not 200 km/h but around 90 - 100 km/h. 150 km/h is the max allowed speed at the cable for the ASK 21.... Thank you so much!!

Only thing I've noticed with the helicopters is too much flat pitch during autorotations. The helicopter does not want to come down like I expect in real life... 4000 hours of flying them. It's not bad, just seems a little off.

Hmmm ... Microsoft shows a video of it's stall, then Austin shows a video of his new stall ... competition is good.

Oh my nerdniness is going to love this. But I have assignments to do, ironically about legacy and new air navigation systems. This will have to wait.

Hi Austin, I am really amazed how much thought is behind your simulator. Here I have a question, because you just make me discover the "Use experimental flight model (requires airplane reload)" checkbox. Will I have to have it checked just as a standard, to have all these features running? Which would be the situation to better use it unchecked?

This is Like Austin Master Class :0)

10m tall wind socks ? Here's what I found: ICAO/CAA standard - 20 ft (6.0 m) mast height

So when does Micheal do his exam? :P

Austin, does the wake turbulence get affected & move in the direction of the wind as it settles?

Can we get a 12.08 flight model etc changes explanation 🙏🏻😁

I installed the beta today. I wanted to see what difference it would make to helos. Take offs, fine. Flight, fine. Landings, SUCKS!! It seems like fixed wing stall characteristics now apply to helos. Nose up attatude to slow forward speed results in falling out of the sky!!

Hi Mike, hi Austin! Your updater is giving me 11.40b1 at the moment. I guess I'll keep checking. I'm in the UK and you're probably rolling it out.

You gave that machine coffee!? Are you high?!

One thing that xp really needs to work on is the control sensitivity. I literally feel like im flying an aerobatic plane when its just a 172

What happened to that door? :-D

Austin, could you do some real world flying with a GoPro so we can see how movement in the cockpit equates to a similar aircraft in XP11? Not all of us get to fly for real. Thnx.

Wind profile.... if you divide by 0 (Hr=0) you get undefined..... cant divide by 0

and then the timeline screws off in a tangent.

Hahaha. A lot of coffee. Hahaha

Hi, Compatible with last RV Vive Cosmos HTC in pre-order now ? Merci.

#WTFisFS2020? IDK who cares when you have XP11 and Austin; the best Devs in the World!

Serious question....Windows 7 or 10 for the best operation...? I'm running 7 as of now...and noticing all the new chances in plane performance in B1.

Can I check the beta in steam or do I need to do it through your site ? Thanks for the amazing sim !

great!

We need realistic wake turbulence instead of bumping it is realistic

RIP Door stop

Since i bought an AMD RX 5700XT , can you please hurry up Vulkan ? ;-)

Love video release notes.

Hey Austin, what is the formula, when is Vulkan going to land ?? I give you 2 months (max).

Learned a lot, thanks :)

Love the math. Love X-Plane. Thanks Austin!

Explained super

Has there been any work to implement (VRS) Vortex ring state in Helicopter flight?

so when xplane will have default volumetric clouds?

When’s the exam?

Any chance for better ATC current phraseology his limited and doesn't match with current actual use as seen on steo and premier1drovers channel. and support for SIDS and Stars? (Yeah I am new and may not be up to datee but thanks for listening)

Thernals influence doesn't depend on the surface of the wing segment? At great surface more thermal effect I thing, in gliders maybe not to mutch important because the surface of each segment mantains contants because the wing have the same surface in the tip or in the center but in airliners the tip of the wing have less surface than the center segment of the wing.

CFIs say that secondary stalls are worse or more dangerous than the first stall. Is there any physics supporting that or is it due to some kind of human or behavioral factors or is that just completely wrong.

I have the 11.40 beta 1 but I cannot find a link for the third beta. I've gone to your web page and went to the beta page but no links. I use the link in the email you sent me for beta1 too but no luck. Help please

I've been to austinmeyer.com and clicked on the X-Plane tab but see only Demo and Buy Now, I see no details about an installer, and nothing about beta, and nothing about 11.40b1 or b3.

I shouldn't watched this, makes me feel really dumb. Anyone know any good online maths tutorials?