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Timmy74

C-130 and excessive "tipping" while taxing....

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Hi Guys,

 

Was just wondering if anyone has a fix for the large amount of -I'll call tipping- while taxing this aircraft...?  What I mean is when taxing and then turning (while taxing) the lean or "tipping" along the aircraft's "X" axis is quite unbelievable...!  Is there something in the aircraft's .cfg file that can be tweaked to reduce or even stop this annoying issue?

 

Or am I the only person who has this issue?

 

Regards,

Tim..

 

 

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Can confirm the issue but never bothered to look for a fix. On the other hand, it seems to be really forgiving on hard landings.

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 On the other hand, it seems to be really forgiving on hard landings.

Touche CoolP but the the "tipping" while taxing drives me NUTS!!!!  

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Well you could experiment with the settings in [contact_points] within the aircraft.cfg.

Will do and will get back to you CoolP.  Thank you for that link I ave never seen that before.  Its great to know now what does what in the aircraft.cfg files.

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Wishing you good luck. Maybe there's more stuff one could tweak but those aircraft.cfg values might well be the easiest (and perhaps roughest) way. The 'Static Compression' parameter sounds most promising to me, but that's nothing more than a hunch.

 

Well, if it helps or even if not, your feedback is most welcome. :smile:

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Apparently it's a feature of the real AC as well.  Emptying the wing tip fuel tanks will help a lot

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Apparently it's a feature of the real AC as well.  Emptying the wing tip fuel tanks will help a lot

I have seen a few C-130's in my time and have never seen them taxing with that much "tipping".  Even the control surfaces are quite over animated to the real aircraft.

Now I have tried emptying the wing tip tanks but does SFA...!?  I can not seem to get my head around the link that CoolP posted in regards to "aircraft.cfg".  I go to [contact_points] but am not sure which entry to change...10 or 11?  Then looking at the C-130's contact_point list its aircraft.cfg file there are multiple numbers to change???  Where the link from CoolP posted does not explain which each one is for?

 

[contact_points]
static_pitch=-0.4
static_cg_height=17.3
max_number_of_points=14
point.0=1,  30.21,  0.0, -17.30, 1500, 0, 1.46, 65, 0.30, 1.20, 0.7,  9, 8, 0, 250, 300
point.1=1, -10.00, -7.2, -18.05, 2000, 1, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 2, 220, 250
point.2=1, -10.00,  7.2, -18.05, 2000, 2, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 3, 220, 250
point.3=2, 0, -66.5065, -0.98, 700, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0
point.4=2, 0, 66.5209, -0.98, 700, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0
point.5=2, 41.8013, 0, -10.6646, 700, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0
point.6=2, 35.5844, 0, -14.2174, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.7=2, 27.9076, 0, -15.4425, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.8=2, -13.0022, 0, -15.4035, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.9=2, -58.327, 0, -2.1478, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.10=2, -49.121, 0, 21.6318, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.11=2, 42.4571, 0, -1.9023, 700, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
point.12= 5, -30.90, -5.250, -7.300, 1600, 0, 0.00, 50.0, 0.0,  0.0, 1.00, 1.0, 1.2, 0, 0.0, 0.0
point.13= 5, -30.90,  5.250, -7.300, 1600, 0, 0.00, 50.0, 0.0,  0.0, 1.00, 1.1, 1.5, 0, 0.0, 0.0
gear_system_type=0
 
Which ones (highlighted) would I change?
 
Cheers,
Tim.. 

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Edited. I've misinterpreted your question. :blush:

 

You are asking which of the 13 points would influence the 'tipping', right?

 

Well, if you are looking for the wheels, those are the point.0=1 types, namely the first three. Their coordinates should give hints as to which wheels we are talking about. point.1 and point.2 look like the main wheels.

 

All others are type 2, defined as 2 = Scrape or type 5 which is 5 = Water Rudder.

 

So you might want to alter

point.1=1, -10.00, -7.2, -18.05, 2000, 1, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 2, 220, 250
 
and
point.2=1, -10.00,  7.2, -18.05, 2000, 2, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 3, 220, 250
 
if you want to edit the Static Compression, or the following numbers when it comes to items like Ratio of Maximum Compression to Static Compression or Damping Ratio.
 
Let me know if this wasn't clear enough. Have the feeling that my explanation is confusing in itself. :blush:

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Edited. I've misinterpreted your question. :blush:

 

You are asking which of the 13 points would influence the 'tipping', right?

 

Well, if you are looking for the wheels, those are the point.0=1 types, namely the first three. Their coordinates should give hints as to which wheels we are talking about. point.1 and point.2 look like the main wheels.

 

All others are type 2, defined as 2 = Scrape or type 5 which is 5 = Water Rudder.

 

So you might want to alter

point.1=1, -10.00, -7.2, -18.05, 2000, 1, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 2, 220, 250
 
and
point.2=1, -10.00,  7.2, -18.05, 2000, 2, 2.25,  0, 1.60, 0.80, 0.9, 11, 9, 3, 220, 250
 
if you want to edit the Static Compression, or the following numbers when it comes to items like Ratio of Maximum Compression to Static Compression or Damping Ratio.
 
Let me know if this wasn't clear enough. Have the feeling that my explanation is confusing in itself. :blush:

 

YEP! I am sooo confused how this all works!?!?  When I read your link it tells me that "11" is "Damping Ratio" so that is why I highlighted the the lines in my last entry... So I must be reading the whole "Contact_Points" in that link all wrong?  Because even contact point 1 and 2 that you explained in your last post tells me in your link that it is "Class" and "Longitudinal Position"???

So you can see why its doing my head in.  How do you know 1.60 is the one to change?   Because due to the link you posted 1.60 sounds pretty damped?  I'll boost it to 1.99 and see how I go?

 

Cheers,

Tim

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You could get 'stiff' values from some other planes since I lack the experience to tell which numeral value would produce the desired outcome.

 

As for finding the right parameters in the first place, the syntax describes that one should read from left to right. The position then defines what the number does. So that long list of numbers actually lists all the 16 different parameters in one line, separately for each contact point.

 

"Each contact point contains a series of values that define the characteristics of the point, separated by commas. A [single] contact point has 16 parameters, described in the following table"

 

point.0=1,  30.21,  0.0, -17.30, 1500, 0, 1.46, 65, 0.30, 1.20, 0.7,  9, 8, 0, 250, 300
 
1 class (0 = None, 1 = Wheel, 2 = Scrape, 3 = Skid, 4 = Float, 5 = Water Rudder)
So we can tell that this is a wheel, point.0 just being the name.
 
point.0=1,  30.21,  0.0, -17.30, 1500, 0, 1.46, 65, 0.30, 1.20, 0.7,  9, 8, 0, 250, 300
 
2 Longitudinal Position, that's the offset on one axis from the reference point, we therefore get to know where that wheel is positioned.
 
point.0=1,  30.21,  0.0, -17.30, 1500, 0, 1.46, 65, 0.30, 1.20, 0.7,  9, 8, 0, 250, 300
 
3 Lateral Position, another offset, but different axis
 
.. and so on, until you arrive at the ninth parameter, which is
 
point.0=1,  30.21,  0.0, -17.30, 1500, 0, 1.46, 65, 0.30, 1.20, 0.7,  9, 8, 0, 250, 300
 
9 Static Compression, which could (mind you I was assuming things there) influence the taxi behaviour, among other things.
 
 
Means that, for every line, the ninth number will be the one you are looking for. Since only the point.0, point.1 and point.2 lines are classified as wheels, you can safely skip the rest.

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I think I have it...?  I was reading down the table and thinking that the wheel dampening was the Point.11=1.

where I should be reading across the line...

Will give it a go changing line 9 and 11 too if it helps.

Thank you CoolP.  Who said computer programming was fun.....!?!

 

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You got it. The lines matter (re: the numbering), not the columns. Good luck.

 

And don't taxi too long, flying is much faster. :P

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