Difference between revisions of "Talk:Parachute"

Revision as of 07:58, 30 May 2015

Full-deployment altitudes depending on pressure?

Hey, there were some edits, that the full deployment altitudes are depending on the pressure like the semi deployment. Now I haven't visited another planet, but according to the part.cfg (e.g. Mk16) the full deployment altitude is defined by the altitude itself and not the surrounding pressure. Can somebody test this and may back this up? — xZise [talk] 14:39, 8 May 2013 (CDT)

The full deployment altitude is always 500 m above ground. That makes a pressure-based trigger impossible, because the air pressure does not "follow" the terrain. (e. g. on a 10km high mountain the air is thinner than at sea level, but the parachutes will fully deploy at 10500m anyway.) It might be possible that the full-deploy height is different for each planet, but there is no config file for such values. Also it would cause the parachutes to deploy much sooner on Eve than they would on Kerbin, because of its high atmospheric pressure. I haven't been there myself, but I checked a video, the parachutes deployed at 1700m, the landing was at 1200m, so 500m above ground. There is no way that this is pressure-controlled. --Dgelessus (talk) 15:34, 8 May 2013 (CDT)

Ah nice ;) Maybe link the video. I'm now changing this article back. — xZise [talk] 16:32, 8 May 2013 (CDT)

Here it is: http://www.youtube.com/watch?v=yj0T-ylVbjU. The landing is in the last few minutes. --Dgelessus (talk) 15:37, 9 May 2013 (CDT)

Here is the same video link with time code http://www.youtube.com/watch?v=yj0T-ylVbjU&t=45m40s. --Omega (talk) 11:19, 10 May 2013 (CDT)

Semi-deployment altitudes

The semi-deployment altitudes listed in the table are not correct for version 1.0.x. It appears the altitudes are computed using an outdated formula that is not compatible with the new atmosphere models. I've computed what the altitudes should be (see table below) but I don't how to edit the table imbedded in the article. If there is somebody else who knows how to do this, I request that you make the appropriate changes. Thanks. — OhioBob (talk) 05:51, 30 May 2015 (UTC)

Thanks for the efforts and information. This is a slightly complex fix. The table is produced by {{Deploy Table Parachutes}}, and the actual altitude numbers come from {{Body data/alt at pressure}} via {{Deploy Table Parachutes/Cell}}. So, if we want to use static numbers, there's a little bit of template de-tangling to do. They are being generated from the old "scale height" and "pressure" using the old method.

It seems that we have 2 choices here. Either fix {{Body data/alt at pressure}} to give "good enough" results, or convert the table to use static data instead of dynamically calculated data. At this precise moment, I'm not certain which is the best way to go, so am not going to attempt to fix it right now. Someone else, please feel free to jump in and work on it, don't wait for me (but I am thinking about how best to fix).

In the interim, I'll add an outdated notice, so that visitors know the data isn't accurate.

--Murph (talk) 07:58, 30 May 2015 (UTC)