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Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 11:01 am
by IAHM-COL
@Bomber
Sweet.
That's encouraging.
I'm surprised to see that the smoothing by itself had such nice effect on the polars!
Had you tried out the spanwise projectors (like 2_2.csv, or 5_5.csv) to check if/how the shape transformation is making sense too?
In shape and in polars obtained.
Best,
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 11:09 am
by IAHM-COL
does something come to mind about why in the resulting polars, for lift given drag, in the green plot, there is no lift coefficients calculated for drag coefficients about 0.175?
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 2:28 pm
by bomber
IAHM-COL wrote:@Bomber
Had you tried out the spanwise projectors (like 2_2.csv, or 5_5.csv) to check if/how the shape transformation is making sense too?
In shape and in polars obtained.
Best,
If you could redo but for 8 sections only... I'd have a like for like comparison.... but as yours is in split into 10, it makes it a bit different.
regards
Simon
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 2:30 pm
by bomber
IAHM-COL wrote:does something come to mind about why in the resulting polars, for lift given drag, in the green plot, there is no lift coefficients calculated for drag coefficients about 0.175?
I'm not sure I understand as I'm not seeing this in the graphAh I see what you're saying.... those are plots per AoA
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 3:23 pm
by IAHM-COL
bomber wrote:
If you could redo but for 8 sections only... I'd have a like for like comparison.... but as yours is in split into 10, it makes it a bit different.
regards
Simon
Yes. I can do.
Do you mean every 0.125 evenly?
like
[0,0.125,0.25, .... 1] ?
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 3:55 pm
by IAHM-COL
bomber wrote:IAHM-COL wrote:does something come to mind about why in the resulting polars, for lift given drag, in the green plot, there is no lift coefficients calculated for drag coefficients about 0.175?
I'm not sure I understand as I'm not seeing this in the graphAh I see what you're saying.... those are plots per AoA
an image is worth 1000+ words
an image with words is worth 1000+words words
![Image](https://i.ibb.co/H2hHfjV/dvl.png)
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 3:57 pm
by bomber
I think it's 1/7 for an 8 wing split
0 = root
0.1428571428571429
0.2857142857142857
0.4285714285714286
0.5714285714285714
0.7142857142857143
0.8571428571428571
1 = tip
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 4:06 pm
by IAHM-COL
https://github.com/IAHM-COL/py-JSBsim-g ... src/outputI think this is what we want
the wing is split in even 8 segments
0 = chord
7 = tip
1-6 = internal segments going from low (chord wise) to high (tip wise)
Used this segments proprortions:
Code: Select all
array([0. , 0.14285714, 0.28571429, 0.42857143, 0.57142857,
0.71428571, 0.85714286, 1. ])
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 4:07 pm
by IAHM-COL
bomber wrote:I think it's 1/7 for an 8 wing split
You are exactly right.
I didnt introduce the numbers myself, so even my brain fooled me, the software said, no no,.
It seems we are good now.
See post above
I did not update images or video, as it is not fully necessary for this test.
but csv files are up to date
Re: A tool for JSBsim Flight Modelling
Posted: Thu Jun 18, 2020 4:09 pm
by bomber
and image of the wing within the Autocad file..
the white dims show the dimensions for the centre of each wing section
https://drive.google.com/file/d/11edKmP ... sp=sharing