Re: [Flightgear-devel] Yasim static friction?

2012-07-06 Thread Andy Ross
On 07/05/2012 02:41 PM, Viktor Radnai wrote: Thanks for that! So just to clarify -- this is a bug in Yasim code (or more like a missing feature) and I'm welcome to fix it?:) I'm just an absentee hacker, so I can't say what is or isn't acceptable any more. But it seems like a sane enhancement

Re: [Flightgear-devel] Yasim static friction?

2012-07-06 Thread Viktor Radnai
Hi there, The rest of this mail will just deal with the gear friction issue for now. Having looked at Gear.cpp I think I can understand the issue a bit better. The method that calculates tire friction is Gear::calcFriction. It looks like this: float Gear::calcFriction(float wgt, float v)

Re: [Flightgear-devel] Yasim static friction?

2012-07-06 Thread Viktor Radnai
Well, I am giving it a shot, but it seems it won't be that easy. See my other (long) mail sent on this topic :) Cheers, Vik On 07/06/2012 05:48 PM, Andy Ross wrote: On 07/05/2012 02:41 PM, Viktor Radnai wrote: Thanks for that! So just to clarify -- this is a bug in Yasim code (or more like a

Re: [Flightgear-devel] Yasim static friction?

2012-07-05 Thread Emilian Huminiuc
On Thursday 05 July 2012 15:21:24 Viktor Radnai wrote: 1. When the aircraft is parked with no parking brake, it will usually start to roll slowly backwards -- pushed by the wind and maybe the runway slope. If I start the engine on idle, the thrust generated by the idle prop might stop this

Re: [Flightgear-devel] Yasim static friction?

2012-07-05 Thread Viktor Radnai
Technically, you also have the compression of the wheels -- when the wheel turns, part of the tire in the front gets compressed while the back gets uncompressed. This is also a friction loss. Plus there is some friction between the rubber and the road. But my point is that the amount of

Re: [Flightgear-devel] Yasim static friction?

2012-07-05 Thread Hyde Yamakawa
Does this happen only left wind, right? Or happens on right wind too? Hyde (2012年07月05日 10:02), Viktor Radnai wrote: Technically, you also have the compression of the wheels -- when the wheel turns, part of the tire in the front gets compressed while the back gets uncompressed. This is also a

Re: [Flightgear-devel] Yasim static friction?

2012-07-05 Thread Viktor Radnai
You mean when the wind is blowing from the front-left of the plane? Cheers, Vik On 07/05/2012 04:14 PM, Hyde Yamakawa wrote: Does this happen only left wind, right? Or happens on right wind too? Hyde (2012年07月05日 10:02), Viktor Radnai wrote: Technically, you also have the compression of

Re: [Flightgear-devel] Yasim static friction?

2012-07-05 Thread Viktor Radnai
The plane gets pushed either forward or backwards by the wind, depending on the wind direction. The prop seems to only get turned in the direction of normal rotation, even in a tailwind, which seems wrong to me. But really the main issue for me is that this amount of wind should not move the

Re: [Flightgear-devel] YASim static friction

2009-05-23 Thread Mathias Fröhlich
Hi, On Friday 22 May 2009 16:55:38 d...@bighost.com.br wrote: Understood, using the simulation time in the groundcache makes it much easier to track. Now it is just a matter of accounting for the FDM and the integrator iteration delays in relation to the cache_time_offset. Hopefully with you

Re: [Flightgear-devel] YASim static friction

2009-05-22 Thread Mathias Fröhlich
Hi Diego, On Tuesday 19 May 2009 03:32:53 Diogo Kastrup wrote: I am sorry for the delay, finally I could get back to this. Besides moving to a new city/job, I have also bought a model airplane, so I feel like a child again with my new toy wasting all my free time playing. Have fun :) I am

Re: [Flightgear-devel] YASim static friction

2009-05-22 Thread dk
Hi Mathias, I have not tested that part of the api. So testers and comments welcome. Hmm, ok. I see. Does the attached patch help? With your code, you might have a better test bed than I have. Thank you for the patch, I will be out of town this weekend so I will try it next week. *In*

Re: [Flightgear-devel] YASim static friction

2009-05-19 Thread dk
I'm sorry for the distraction, but since you brought it up, you have to tell us about your model airplane! :-) Lol, of course, I should have imagined :) There is a small lake near my house I can walk to, so I have been having a blast on calm evenings with my Seawind park flyer:

Re: [Flightgear-devel] YASim static friction

2009-05-18 Thread Diogo Kastrup
Mathias Fröhlich escreveu: Prototyped and checked in. I don't claim that it is bug free. So help chasing them :) Feel free to ask if something is too bad documented or does not work as expected. Hi Mathias, I am sorry for the delay, finally I could get back to this. Besides moving to a

Re: [Flightgear-devel] YASim static friction

2009-03-06 Thread Mathias Fröhlich
Hi, On Thursday 05 March 2009 22:08:54 Diogo Kastrup wrote: That sounds great, I am looking forward to using this improved groundcache. I couldn't test it so far but I will try to update the friction code ASAP. Unfortunately I am going to stay away from fgfs a little longer than expected.

Re: [Flightgear-devel] YASim static friction

2009-03-05 Thread Diogo Kastrup
Hello, Mathias Fröhlich wrote: Ok, I am working on a major overhaul to speed up and generalize the ground intersection stuff. So parts of what you code is already covered by that more general approach. When I look at your patch, the only thing that is missing so far in the ground

Re: [Flightgear-devel] YASim static friction

2009-03-05 Thread Mathias Fröhlich
Hi Diego, On Thursday 05 March 2009 22:08:54 Diogo Kastrup wrote: That sounds great, I am looking forward to using this improved groundcache. I couldn't test it so far but I will try to update the friction code ASAP. Unfortunately I am going to stay away from fgfs a little longer than

Re: [Flightgear-devel] YASim static friction

2009-02-27 Thread Mathias Fröhlich
Hi, On Monday 23 February 2009 03:41:17 Diogo Kastrup wrote: I finally got this working with the carrier, here is the patch. Please let me know what you guys think about it. Features: - No more sliding when should be stopped. - better behavior when cornering - better braking behavior *

Re: [Flightgear-devel] YASim static friction

2009-02-23 Thread Diogo Kastrup
Csaba, thank you very much for testing. See my comments below. Em Seg, 2009-02-23 às 04:59 +0100, Csaba Halász escreveu: I tested with the bo105 on solid ground first. It doesn't move an inch with engines shut down. During startup, it doesn't turn either. The s76c (which has wheels instead of

Re: [Flightgear-devel] YASim static friction

2009-02-23 Thread Diogo Kastrup
Em Seg, 2009-02-23 às 17:58 -0300, Diogo Kastrup escreveu: The carrier sailing out from underneath is strange, it looks like the groundcache can't finding a intersection with the ground for these aircrafts and it is using a fallback value. Can someone check if this happens without my patch

[Flightgear-devel] YASim static friction

2009-02-22 Thread Diogo Kastrup
Hello, I finally got this working with the carrier, here is the patch. Please let me know what you guys think about it. Features: - No more sliding when should be stopped. - better behavior when cornering - better braking behavior * Problems: - More information about the brake system is needed