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McDonnell Douglas MD-11

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Re: McDonnell Douglas MD-11

Postby Octal450 » Wed Aug 10, 2016 9:21 pm

I got the AP using elevator, then using the trim slowly to bring the elevator back to neutral. I'm testing it in my AP, might be something nice to put in the MD-11, I'll try it when I put FLCH. Just need to change your controllers to use /controls/flight/elevator (or elevator-filter, I don't remember), then my system takes care of the rest. When the AP is off, you can trim the aircraft normally. I am working on making this much slower, and delayed, to simulate autotrim/LSAS/FBW.

Josh
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Re: McDonnell Douglas MD-11

Postby tikibar » Thu Aug 11, 2016 7:11 am

Hi Josh,
I've got a couple more things to adjust in the AFS: the thrust on step climbs, and the rate of change for Mach by pitch mode. Hopefully by the weekend. There was a bit of a setback when I screwed up and deleted a bunch of stuff and had to do it over again.
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Re: McDonnell Douglas MD-11

Postby Octal450 » Thu Aug 11, 2016 8:06 pm

John,
Alright I won't nag you anymore ;)

does the PROF (vnav) work on this model?

Josh
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Re: McDonnell Douglas MD-11

Postby tikibar » Fri Aug 12, 2016 2:09 am

Yes and no. Yes, PROF mode will automatically change the target altitude using information from the route manager, and it will automatically engage CLB THRUST mode when the target altitude changes. No, it does not adjust climb/descend rates to account for distance.
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Re: McDonnell Douglas MD-11

Postby Octal450 » Fri Aug 12, 2016 5:29 am

@tikibar
OK thanks.

Looking forward to the next update :)

Josh
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Re: McDonnell Douglas MD-11

Postby Octal450 » Sat Aug 13, 2016 1:33 pm

@tikibar
Great! The following things need to be fixed:
AP change from VS to ALT HOLD needs to also be 500 ft before target altitude. (important)
When descending, the pitch mode should be IDLE CLAMP (minor issue)
Engaging Flight Director puts LOC mode on???? (minor issue)

I've adjusted FLCH and installed my elevator system. The AP now operates the surfaces like a real MD-11. It is on my repo. It's working very very well now. Looks like months of banging my head against a wall finally paid off!

:D

Best,
Josh
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Re: McDonnell Douglas MD-11

Postby tikibar » Sun Aug 14, 2016 7:28 am

Okay! Fixed those three issues. I just eliminated the pick animation from the FLT DIR button, since we don't have a flight director at the moment and engaging LOC is definitely wrong.
I love the auto trim feature. That is working great!
I tuned the ALT and VS modes a little bit. ALT had a persistent oscillation at FL370, and VS was a little overly aggressive. Your IAS by pitch is working great. Mach by pitch is a little aggressive in making speed changes. Is there some way to slow that down? It might be more difficult with the combined control loop.

All my changes are pushed to my repo.

Cheers,
John
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Re: McDonnell Douglas MD-11

Postby Octal450 » Sun Aug 14, 2016 2:28 pm

@tikibar
Great thanks!
I'll pull and merge

I'll tune the Mach by Pitch right now :)

If you want to try it as well, reducing the number in these lines:
774: <scale>500.0</scale>
787: <scale>500.0</scale>

Reducing the numbers makes it less aggressive.
Just make sure they are both the same, or funny things happen!


Feel free to take my controllers to any planes you want. It's all GPL.

The oscillations are probably since the trim doesn't change the pitch as quickly as the elevator, so the controllers are slightly out of tune.

I also have a flight director system, which works by taking the target-pitch-deg and target-roll-deg. I'll try to implement it.

EDIT: I've tuned Mach by Pitch, Doing some test flights, then I'll push.

Glad you like it,
Josh
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Re: McDonnell Douglas MD-11

Postby Octal450 » Sun Aug 14, 2016 7:07 pm

There is a problem I cannot understand: The route disappears from the Nav Display sometimes.

Image

PITCH sometimes missing from PFD -- my fault -- I fix.
Also, the LNAV controller could use more precision, he missed my waypoint TAU about 5 nm. since the new FDM, It takes more Yoke to bank.

Everything else is OK!

Also, do you have any ideas to find out of the plane is taking off or landing? The ailerons droop only on takeoff at Flap 15(dial a flap)

EDIT: I got flight director working nicely off /autopilot/internal/target-pitch-deg. But for roll! /autopilot/internal/target-roll-deg is ALWAYS 0! How this is possible? In the MD11-autopilot.xml file, every roll property uses this... I cannot understand.

Josh
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Re: McDonnell Douglas MD-11

Postby tikibar » Tue Aug 16, 2016 2:21 am

The route only appears on the ND when it is active. If you haven't pressed 'Activate' on the RTE or LEGS page of the CDU or in the Route Manager dialog, the route won't appear. Changing the departure runway after activating will de-activate. Overflying the destination airport will usually de-activate.

The LNAV can be affected by the bank limiter. If you try to take too sharp a turn too fast, it can make you swing too wide. Sometimes you have to either slow down or increase the bank angle limit manually to make a tight turn.

For that flight director property... all I can think of to suggest is check the spelling, capitalization, and make sure you don't have a _ instead of a -.

I just pushed something for the aileron droop problem. Give that a try. :)
John
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Re: McDonnell Douglas MD-11

Postby Octal450 » Tue Aug 16, 2016 2:37 am

tikibar wrote in Tue Aug 16, 2016 2:21 am:The route only appears on the ND when it is active. If you haven't pressed 'Activate' on the RTE or LEGS page of the CDU or in the Route Manager dialog, the route won't appear. Changing the departure runway after activating will de-activate. Overflying the destination airport will usually de-activate.


John,

ND:
Nope. I was flying along. Then it just disappeared. Then it came back about 2 mins later???

Bank Limiter and LNAV:
Just beware: in the real aircraft, LNAV doesn't follow the bank limiter switch. It is hard set to 25 deg under a certain altitude, (I'll grab that for you tomarrow) and then reduced to 15 or 20 above that altitude.

Target Roll Degree:
The strange thing happens before the FD. Target roll deg doesn't change. So how does the roll modes work? I am going to mess around with it.

Aileron Droop:
Let me just warn you that what you did would *disable* the animation, so the aileron could get stuck drooped on certain conditions. I am going to use a filter to fix this, and set the /surface-positions/aileron-droop to flaps, if controls/flight/droop is true, and back to 0 if it's false. I'll do it all tomorrow. Also, when we implement dialaflap, that will be helpful.

Speaking of dialaflap, I'm trying to add it to my MD-88/MD-90 family right now, so I'll port that to the MD-11 later if I succeed. Then I'll model the dial in the VC.

Autospoiler:
Also autospoiler doesn't seem to work properly.
Spoilers 3 on touchdown, then when nose gear down, spoilers 4.
In the air, you cannot select more than spoiler 3. Can you add this as well? (when you have time of course :) )

AFDS:
APPR/LAND button should arm BOTH LOC and G/S. It cannot be unarmed with the button, only if another roll mode is commanded. (HDG HLD, SEL, LNAV) Changing the Pitch mode does not disarm G/S or LOC.

In other news, the Systems Display has now 2 pages and a switcher! Pitch trim handle animation was wrong, I fixed. Coming soon...
I've pushed an update to Mach by Pitch. it should be less aggressive now. Also a fix in exterior stab trim animation.

Best,
Josh
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Re: McDonnell Douglas MD-11

Postby tikibar » Tue Aug 16, 2016 4:28 am

I'm not sure about the ND, then. Deactivating the route doesn't happen within the aircraft codes. That's in the route manager itself.

I added a limiter to the spoilers when it's in the air. What else is wrong with the autospoiler?
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Re: McDonnell Douglas MD-11

Postby Octal450 » Tue Aug 16, 2016 2:39 pm

It selects spoiler 3 on landing, as it should, but then it does not advance to spoiler 4 when the nose gear is down.

Hmm, this only happens in the MD-11. I'm going to test it a bit later.

Pulled @ merged. Did you have a chance to test mach by pitch yet?
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Re: McDonnell Douglas MD-11

Postby tikibar » Tue Aug 16, 2016 3:55 pm

Your a61ddee commit only contains changes to the horizontal stabilizer animations, not to the mach by pitch...

Admittedly, I only did one test on the fix for the speedbrakes, but it worked like it was supposed to: spoilers to 3 on main gear touchdown, then to 4 on nosegear touchdown.
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Re: McDonnell Douglas MD-11

Postby Octal450 » Tue Aug 16, 2016 5:34 pm

Hmm OK. Let me check my commit!

Yep my bad,
Commit 233e7fb should have it.

I'll test today.
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