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737-800 Development (ex build the best jet in Flightgear)

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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Octal450 » Thu Jan 18, 2018 10:08 pm

I need to know what you are judging it by. If you are judging it based on that version of the Airbus, then I cannot take your account seriously. That version had major FDM problems.

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Josh
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby legoboyvdlp » Fri Jan 19, 2018 3:13 am

Unless you have wierd texture problems then you have an ancient version of the A32X. Didn't the update checker work?


Also, I found some videos on my computer with clear sound recordings of the 737. They may or may not be ready by Sunday.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby V12 » Fri Jan 19, 2018 5:30 am

it0uchpods :
I downloaded most recent A32x and here is comparison with 737 :
- A320 reacts on rudder without any jerk, absolutly smooth and lineary, 737 starts turn with jerk with high yaw rate
- roll similar for both planes
- A320 changes pitch again perfectly smoothly, 737's initial reaction is significant faster, then similar to A320
IMHO, 737 has only 1 glitch - reaction on the rudder.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Octal450 » Fri Jan 19, 2018 12:29 pm

Okay... But:

* They are different planes. I imagine they are similar behaved though
* Did you test with FBW in DIRECT? Or else you feel the FBW not the FDM

I found some 737 rudder data, once I have time I'll implement it. But wait, I am busy.

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Josh
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby V12 » Fri Jan 19, 2018 3:12 pm

No, I didn't test direct law.
But thank You for explanation.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Octal450 » Fri Jan 19, 2018 3:22 pm

Sure.

Then yes, my FBW stuff was flying the FDE, not you :wink:

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Josh
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby V12 » Fri Jan 19, 2018 3:26 pm

Direct law tested, aircraft's reaction on rudder is normal - smooth and without jerky. I was absolutly surprised with precision of the simulation - I was able maintain height only with thrust. Absolutly amazing work !
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Octal450 » Fri Jan 19, 2018 3:31 pm

Thanks much.

OK. I imagine the rudder response should be similar given they are a similar sized aircraft and vstab.

Once I finish up my current MD-11 FDE work I'll take a look at the 738's yaw axis.

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Josh
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby V12 » Sat Jan 20, 2018 5:27 pm

One more thing on 737 should be tuned - brake efficiency. At Edwards AFB I made some tests :
viewtopic.php?p=326595#p326595
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby legoboyvdlp » Sat Jan 20, 2018 6:14 pm

New sounds published and released under the GNU GPL 2.0. A sound file which was used illegally, rain.wav was removed --> this file can be included in software, including commercial software freely... but cannot be redistributed, as in an opensource software.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Soitanen » Mon Jan 22, 2018 6:41 am

Just some data from flight test for brakes tuning:

Test 1.
GW - 133650 lbs. Brakes + spoilers. No reversers. Dry runway. Sea level. Measure time and distance when decelerating from 136 kts to 1.5 kts ground speed.
Results: Time - 15.2 sec. Ground roll distance - 1661.4 ft.

Test 2.
GW - 138438 lbs. Brakes + spoilers. No reversers. Dry runway. 3468 ft pressure altitude(ICAO KROW, runway 21). Measure time and distance when decelerating from 127 kts to 0.05 kts ground speed.
Results: Time - 15.7 sec. Ground roll distance - 1542 ft.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby omega13a » Mon Jan 22, 2018 6:57 am

legoboyvdlp wrote in Sat Jan 20, 2018 6:14 pm:New sounds published and released under the GNU GPL 2.0. A sound file which was used illegally, rain.wav was removed --> this file can be included in software, including commercial software freely... but cannot be redistributed, as in an opensource software.

I'm sure there's a free rain sound file out there that could replace it.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby GabrielYV » Mon Jan 22, 2018 8:48 am

Thanks @soitanen

@omega13a, in version 1.0 will come a new sound of rain, do not worry.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby V12 » Mon Jan 22, 2018 9:05 pm

Thanks GabrielYV,
now, Your 737 flying really very good, reactions on rudder are nice smooth. Braking distance and deceleration is in realistic range from 3 to 4 m/s2. Perfect job.
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Re: 737-800 Development (ex build the best jet in Flightgear

Postby Octal450 » Tue Jan 23, 2018 2:29 am

@V12
It was a bit of a quick and dirty fixing for now, as I am currently in the hospital. It should be fine tuned a bit more. Thanks @soitanen for the info.

Kind Regards,
Josh
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