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McDonnell Douglas MD-11 Development

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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Fri Jan 15, 2021 2:47 am

Thanks guys!

Now we have LSAS overspeed protection is AFS is off or unavailable (like in this gif, i slapped the OVRD switches down to kill AFS/ATS speed protection)
basic logic:
- engages only if AP is off
- speed target varies based on throttle positon
- uses speed rate for control to prevent endless pitching up to stupid attitudes
- engages if ATS protection is unable to correct the situation, or ATS is unavailable
- takes the place of AFS speed on pitch overspeed protection as AP will not come on its own, fd bars will stIll show FCC guidance unless AFS OVRD is off (like in the gif, then speed protection from AFS is non functional)
- pilot can defeat it by pushing the yoke hard, the LSAS inputs as usual are summed to the pilots inputs
- pilot can increase the recovery rate by pulling back further, as LSAS is only able to use 5 degrees of elevator
- LSAS resumes normal Pitch attitude hold/pitch rate damping mode after recovering from overspeed.
- LSAS does not protect slat/flap/gear overspeeds!
- LSAS does not protect against Vmin/Vstall like this, there is alpha based protection that I'll model later.
Obviously its more complex than this but thats the summary. See FCOM for details, its modelled as per that.

2 examples in this gif.
Image

What a complex flight control system this plane has, but its been good fun to model!

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby GinGin » Fri Jan 15, 2021 2:52 pm

Impressive work. The gif thing highlights well the changes .
How many hours did you spend on that?
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Re: McDonnell Douglas MD-11 Development

Postby The epic chicken » Fri Jan 15, 2021 3:27 pm

the stall protetion is pretty good



also i dont know how but i broke the irs again
Imagefgfs-20210115152144 by the epic chicken the epic chicken, on Flickr
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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Fri Jan 15, 2021 5:28 pm

also i dont know how but i broke the irs again

Well I don't know how either because you didn't show me anything related to it. IRS switch position, did you let it align during manual start? did you force the aircraft to move (even though brakes fully locked) during panel state loading?

GinGin wrote:Impressive work. The gif thing highlights well the changes .
How many hours did you spend on that?

Alot. Most of the time I wasn't working lol.

I fixed the CRTs looking stupid at night.
Daytime:
Image

Nighttime:
Image

Its a slow fade inbetween based on the amount of light (red) in the sim. That way it looks more proper. CRTs are not backlit, so as the surrounding light gets darker, the black gets more blacker. The LCD IESI will not have this, the FMS's will as they are CRTs.

Also removed the rating indication of the PW EAD, someone told me it should be there a while back... but looking at real pictures its not. So idk ...

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby F-PTCZ » Fri Jan 15, 2021 8:36 pm

Great plane, very confortable to fly !

Is it normal the MCDU does not work ?

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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Fri Jan 15, 2021 10:48 pm

F-PTCZ wrote in Fri Jan 15, 2021 8:36 pm:Great plane, very confortable to fly !

Is it normal the MCDU does not work ?

Laurent


It only works in my dev version, i'm working (slowly) on the MCDU system. But I have other things to done first.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby The epic chicken » Sat Jan 16, 2021 1:07 pm

i think the irs broke because the runway it was on was sloped
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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Sat Jan 16, 2021 2:46 pm

Hmm, that's actually an interesting point. What runway did you use? Perhaps I made an error.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby The epic chicken » Sat Jan 16, 2021 3:10 pm

it sounds dumb but i wanted to see if you could use an md-11 at lukla
rw 24
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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Sat Jan 16, 2021 5:27 pm

Reproduced.
Seems the airplane being pointed so far downward means when jsbsim "fast-starts" the engines it is enough to override the braking force... making IRS align no work.

OK FINE, I just set the engine thrust by a factor of 0 if autoconfig is running to fix it... lol. Better than using slow start for panel states.
Fixed as of 1006.

Thanks mr epic chicken! Another pilot reported that the IRS went away for him but we couldn't figure out why.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby The epic chicken » Sat Jan 16, 2021 5:36 pm

just so you know i had the parking brake on
and i was holding down b
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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Sat Jan 16, 2021 6:03 pm

yeah, but I modelled the breaks realistically, not overpowered like some planes.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Tue Jan 19, 2021 4:25 pm

Added bug parking for speed and altitude, will add for heading later
Image

Also I fixed the thrust ratings above the rated temps, now the thrust you get is reduced properly. its not 100% spot on but its fairly close. I'll continue to refine it in the future.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Sun Jan 24, 2021 10:13 pm

Simulated brake system hydraulics
about 10 apply/releases with full accumilator pressures + no other hyd
rate of breaking apply/release falls drastically under 750psi

Image

This indicator now displays proper info
all thou the 3D needs some tweaking, ill improve it later

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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Re: McDonnell Douglas MD-11 Development

Postby Octal450 » Sun Jan 24, 2021 11:44 pm

Now the center main gear brakes actually work properly, and all the hydraulic brake system calculations have been updated to include them.

Kind Regards,
Josh
Skillset: JSBsim, Systems, Canvas, Autoflight/Control Systems, Basic Animations
Aircraft: MD-11 (Mainly), A320-family, MD-80, Contribs in a few others

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