3161: Airspeed

2025-10-30T10:09:36Z

Jarfil: /* Explanation */

{{comic
| number = 3161
| date = October 29, 2025
| title = Airspeed
| image = airspeed_2x.png
| imagesize = 293x338px
| noexpand = true
| titletext = Carefully maneuvering the balloon down a mineshaft in an effort to break the OTHER altitude record
}}

==Explanation==
{{incomplete|This page was created by a HOT AIR ROBOT. Don't remove this notice too soon.}}

{{w|Airspeed}} is the velocity of an aircraft relative to the air it's flying through. This differs from {{w|ground speed}}, which is the velocity relative to the ground below, because we adjust for the speed of wind around the aircraft. Most powered-flight airspeed records (from human-powered aircraft to rocket-planes) are made with reference to the attained passage through the air, as both traditionally easier to establish, from within the craft itself, and in order to disregard either assisting or opposing winds at the flying altitude. Ground speed is usually what passengers care about, since it relates to how soon you'll reach your destination.

Airspeed is useful to aircraft designers and pilots, since it reflects how much power is needed, and the aerodynamic behaviour of the lift and control-surfaces. When you're flying in the same direction as air movement (a "tailwind"), you get more ground speed from the same airspeed, because the wind is boosting your speed; conversely, when you have a headwind, you'll either have lower ground speed with the same engine power, or you'll need more power to get the same ground speed. Prevailing winds in the {{w|middle latitudes}} tend to flow eastwards, which explains why west-to-east flights are often quicker than the corresponding east-to-west flights for such air-commerce as the trans-Atlantic routes between the US and Europe.

Unlike airplanes, helicopters and dirigibles, {{w|hot air balloons}} are pushed by the wind itself and don't have their own source of power for horizontal propulsion (the heated air in the balloon allows vertical propulsion due to {{w|buoyancy}}, but this is specifically disregarded by the wording used in the comic). This means that their airspeed is normally very close to zero. It may differ occasionally if the wind changes suddenly, in velocity or direction, as it will take a few seconds for the balloon to overcome its inertia. If the wind drops, the balloon may coast a bit at the higher speed, but a large balloon will have plenty of drag, so it will not take long to match the new wind speed.

An additional possibility is that it is straddling a significant wind-shear layer that affects the upper parts of the balloon differently from the lower parts, but this does not appear to be the case here, especially as the "level flight" stipulation would seem to disqualify the particularly vertically-turbulent conditions (updrafts and downdrafts) that would accompany this. Away from ground level and the effects of undulating terrain or ground-based structures (and assuming no large powered aircraft have themselves based nearby), the laminar nature of the air means the tends to more gently transition, within the height of a balloon.

In the comic, [[Megan]] and [[Cueball]] are trying to break the record for balloon airspeed. Cueball's exclamation "yessss!" suggests that they achieved it when there was a gust of wind that allowed them to coast at 2 MPH.

A more common record that people try to achieve with balloons is altitude (at this time the current record is 69,850 feet, set in 2005). The title text suggests achieving a negative altitude record by allowing the balloon to descend down a mineshaft. This could just be in relation to the height of the land in the immediate vicinity of the mineshaft, but could also be with respect to {{w|mean sea level}}, similarly avoiding direct comparison against the ground. With the typical width of a properly inflated balloon being greater than a typical mineshaft, it could be a logistical challenge to make a controlled descent. Unless an open pit mine were to be considered a mineshaft, with the {{w|Jwaneng diamond mine}} reaching a depth of 625m.

==Transcript==
{{incomplete transcript|Don't remove this notice too soon.}}
:[A hot air balloon is shown with its six vertical panels alternating in black and white. Megan and Cueball are riding in the basket, with Cueball looking over the side and down while Megan looks at something inside the basket, also looking down.]
:Megan: 0 MPH... 0 MPH... Ooh, 1 MPH with that last gust... 0 MPH... 1 MPH... 1 MPH... '''''2 MPH!!!'''''
:Cueball: YESSSS!
:[Caption below the panel:]
:Breaking the hot air balloon level-flight airspeed record
{{comic discussion}}<noinclude>

[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]

Talk:3116: Echo Chamber

2025-07-17T13:40:48Z

Jarfil:

Sorry no " somehow also causing the events themselves to happen repeatedly" is wrong; the point is that people post videos of their cats doing "things" repeatedly; that's just what happens, not an implied effect of the echo chamber itself. [[Special:Contributions/31.54.45.20|31.54.45.20]] 08:39, 17 July 2025 (UTC)
: Weird things happen in xkcd-land. [[Special:Contributions/82.13.184.33|82.13.184.33]] 09:14, 17 July 2025 (UTC)

What has {{w|The dress}} got to do with an eco chamber? Seems like a poor example. [[Special:Contributions/192.101.166.237|192.101.166.237]] 09:51, 17 July 2025 (UTC)
: Agree. It was an optical illusion that people even very close together, perceived differently, nothing to do with echoing each other's arguments. --[[User:Jarfil|Jarfil]] ([[User talk:Jarfil|talk]]) 13:40, 17 July 2025 (UTC)

I think the "purely partisan fishing expedition" might be the other way around: Cueball expected an expedition where actual fishing would happen, but got into a "purely partisan" or metaphorical "fishing expedition". --[[User:Jarfil|Jarfil]] ([[User talk:Jarfil|talk]]) 13:40, 17 July 2025 (UTC)

Talk:1620: Christmas Settings

2015-12-23T05:32:11Z

Jarfil: Created page with "That's how Little Johnny killed Christmas, he left the tap running all night. --~~~~"

That's how Little Johnny killed Christmas, he left the tap running all night. --[[User:Jarfil|Jarfil]] ([[User talk:Jarfil|talk]]) 05:32, 23 December 2015 (UTC)

explain xkcd - User contributions [en]

3161: Airspeed

Talk:3116: Echo Chamber

Talk:1620: Christmas Settings