FBW A320 HARD Stutters

[cchiozza 111]

How do you turn copilot off? I did not know it was on. I missed that. Tried DEV and same thing just hard predictable stutter. Its a new machine 12900KF 3080. All other planes are fine. I am not sure what else to try.

[Adrian123 1,016]

2 hours ago, jcomm said:

I'm on the experimental and I do have VNAV. It's not 100% ok, but it's fine !

Odd. Mine doesn't.

[cchiozza 111]

Not sure what I am doing. It was not always like this. 

[Bdub22 1,639]

2 hours ago, Adrian123 said:

4 hours ago, jcomm said:

I'm on the experimental and I do have VNAV. It's not 100% ok, but it's fine !

Odd. Mine doesn't.

You still need to plan your own top of descent. But, if you have all the altitude constraints dialed in for your arrival and start the plane down on managed mode, it will not go below an altitude constraint, and once it's past it, it will automatically descend down to the next step. Works flawlessly. 

Example. I'm at FL390 and the final approach fix is 3,000. With all my constraints in the FMC per the STAR, I can put 3,000 in the altitude selector and just press the ALT knob in. It'll stop at or befoew the first waypoint, lets say FL170, once it's past that, it knows the next constraint is say, FL110 and it will automatically start descending again for that target. 

Edited March 9, 2022 by Bdub22

[jcomm 6,064]

As per @Bdub22 above. That's how I presently "VNAV" in the FBW A320 Experimental, but I've just opted for the Development variant now for more testing.

Edited March 9, 2022 by jcomm

[vrdubin6 184]

I also noticed in my recent flight that it handles speed constraints much better. Not sure how new this is, as I don't get to fly as much as I'd like, but it will now maintain current speed until about 5 miles out from a waypoint with a restriction. Prior to this it would always apply the speed restriction for the entire leg leading up to that waypoint.

[IcemanFBW 721]

There is no VNAV or custom FMS v2.0 in the experimental version as of right now, only other various improvements including constraint logic and LNAV improvements.

[Adrian123 1,016]

1 hour ago, Bdub22 said:

You still need to plan your own top of descent.

Then that technically is not VNAV mode. Why do people make those statements or do they not know what what true VNAV is?

[Maxis 1,905]

2 hours ago, Bdub22 said:

You still need to plan your own top of descent. But, if you have all the altitude constraints dialed in for your arrival and start the plane down on managed mode, it will not go below an altitude constraint, and once it's past it, it will automatically descend down to the next step. Works flawlessly. 

Example. I'm at FL390 and the final approach fix is 3,000. With all my constraints in the FMC per the STAR, I can put 3,000 in the altitude selector and just press the ALT knob in. It'll stop at or befoew the first waypoint, lets say FL170, once it's past that, it knows the next constraint is say, FL110 and it will automatically start descending again for that target. 

Ok... thats also how I use the AC but thats just the autopilot  respecting constraints.. not VNAV.. at least in My opinion. Until we have proper TOD and a actual VNAV with proper RNAV and hopefully RNP... there's no vnav implementation as yet...

 

Unless you want to download the files from their  experimental vnav branch from their github and futz around with getting that to work.

Edit.. on my phone.. just saw that @IcemanFBW responded as well.

 

Edited March 10, 2022 by Maxis

[Mike S KPDX 598]

Oddly, I too am experience hard stutters using the latest experimental version with the last msfs update.  Never had an issue before but I am off to do a series of tests to try to nail down the when, where and what of this for my PC at least.

[LarsA 90]

The experimental version seems indeed to be responsible for the hard stutters at the moment. I had the same problem yesterday - including missing FD markers on the PFD. Went back to the development version today and had a very smooth flight without any problems from EDDL to EGLL including a lot of AIG-traffic and some other add-ons in this area. 

[Bunchy 229]

11 hours ago, cchiozza said:

How do you turn copilot off? I did not know it was on. I missed that. Tried DEV and same thing just hard predictable stutter. Its a new machine 12900KF 3080. All other planes are fine. I am not sure what else to try.

just turn the brightness of the ND and PFD all the way down and it will switch off the displays

[jcomm 6,064]

Couldn't experience any stutters with the Experimental version, no matter how long ( up to 5,5 hrs ) my flights lasted, so last night experimented with Developer and the same applies - smooth from beginning to the end.

.) I am on Win 11;

.) I am on DX 11 because of the FBW, otherwise I would keep DX12 which works beautifully in Win 11;

Recently I suggested one of the forum member ( ega ) to migrate to Win11 which he did. I am curious about the performance he gets from it compared to Win 10.

For me Win 11 is one of the best versions of Windows, maybe on pair with Win XP. Wouldn't look back even if Win 10  called...

 

Edited March 10, 2022 by jcomm

[DAD 2,667]

12 minutes ago, jcomm said:

Couldn't experience any stutters with the Experimental version, no matter how long ( up to 5,5 hrs ) my flights lasted, so last night experimented with Developer and the same applies - smooth from beginning to the end.

.) I am on Win 11;

.) I am on DX 11 because of the FBW, otherwise I would keep DX12 which works beautifully in Win 11;

Recently I suggested one of the forum member ( ega ) to migrate to Win11 which he did. I am curious about the performance he gets from it compared to Win 10.

For me Win 11 is one of the best versions of Windows, maybe on pair with Win XP. Wouldn't look back even if Win 10  called...

 

exactly my experience and observation, for both FBW exp and Win11. Just smooth

[jarmstro 2,406]

4 hours ago, jcomm said:

Couldn't experience any stutters with the Experimental version, no matter how long ( up to 5,5 hrs ) my flights lasted, so last night experimented with Developer and the same applies - smooth from beginning to the end.

.) I am on Win 11;

.) I am on DX 11 because of the FBW, otherwise I would keep DX12 which works beautifully in Win 11;

Recently I suggested one of the forum member ( ega ) to migrate to Win11 which he did. I am curious about the performance he gets from it compared to Win 10.

For me Win 11 is one of the best versions of Windows, maybe on pair with Win XP. Wouldn't look back even if Win 10  called...

 

I wonder why the FBW doesn't like DX12? Are there any other planes similarly afflicted? I'd switch otherwise.