Talk:2016: OEIS Submissions

2018-07-06T21:01:13Z

172.68.174.94:

"All integers which do not appear in the example terms of another OEIS sequence" there is no paradox: it's pecified *another* sequence
[[Special:Contributions/162.158.154.133|162.158.154.133]] 17:52, 6 July 2018 (UTC)

I am so sorry that this comment is not related to the strip, but is the scaling for the explanation way off? Previously the scaling of the whole website was stretched, but now it is a bit too cramped for me. It happens to the previous strips too.Boeing-787lover 18:10, 6 July 2018 (UTC)

Is it too much of a stretch to mention that Chris Hemsworth stars in the movie ''Blackhat'', which is also a nickname for an XKCD character? [[User:John at work|John at work]] ([[User talk:John at work|talk]]) 19:31, 6 July 2018 (UTC)

The Sub 59 one is also a paradox, it specifies that it should include all of the author's accepted submissions, so it would have to be on it's own list itself in order to be accurate? [[Special:Contributions/172.68.58.233|172.68.58.233]] 19:47, 6 July 2018 (UTC)
:No, it would not be paradoxical. If it is accepted, then the sequence contains its identification number. If it is not accepted, that number is not in the sequence. The sequence changes depending on its own status, but there is no contradiction. This is different from e.g. the set of sets that don't contain themselves. If that set contained itself, it shouldn't contain itself, and if it didn't contain itself, it should contain itself. Both alternatives are logically impossible, so the set itself is impossible. There is nothing impossible about submission 59. [[User:Howtonotwin|Howtonotwin]] ([[User talk:Howtonotwin|talk]]) 20:15, 6 July 2018 (UTC)

The Westside IRT stops sequence is a wonderful piece of trivia. I found [https://www.nytimes.com/1987/01/27/science/in-a-random-world-he-collects-patterns.html the NYT article], which gives as its reason that at that time only infinite sequences were included. I have failed to find the necessary third-party reference to the inclusion of the sequence in OEIS (this, being an open wiki, is unacceptable) to include the point in {{w|IRT Broadway–Seventh Avenue Line|the Wikipedia article on the West Side IRT}}. Can anybody supply one? [[User:Yngvadottir|Yngvadottir]] ([[User talk:Yngvadottir|talk]]) 20:35, 6 July 2018 (UTC)

I'm wondering about the comment "In UTF-16, a 9 takes up 2 bytes," about the 2 TB of 9s. Does OEIS store numbers in UTF-16 format? [[Special:Contributions/172.68.174.94|172.68.174.94]] 21:01, 6 July 2018 (UTC) nprz

Talk:1972: Autogyros

2018-03-28T03:21:55Z

172.68.174.94: Answering "cannot hover" - no, it can't - by the usual definition of "hover."

;Land vertically?

Hi, searching 'autogyro' has led me to find autogyros can't land vertically. Could this be a mistake on Randall's part, or am I missing a joke here?

[[Special:Contributions/172.69.186.58|172.69.186.58]] 13:55, 26 March 2018 (UTC)

:I just read about them on Wikipedia and I see that they can't take off vertically, but there are kinds (possibly all) that can land vertically [[Special:Contributions/108.162.219.76|108.162.219.76]] 14:01, 26 March 2018 (UTC)

::The Wikipedia article was edited this morning to claim that they could not land vertically, but the edit was short-lived and reverted. So, be careful what you trust. [[User:JohnHawkinson|JohnHawkinson]] ([[User talk:JohnHawkinson|talk]]) 14:37, 26 March 2018 (UTC)

::It appears they can land vertically with the correct wind conditions. Here is a YouTube video: https://www.youtube.com/watch?v=GAoK9zM8FFQ - and they say "Actually it is a 'Zero GROUND Speed Landing' approx. 25 kts headwind".

::Here is a YouTube video of a zero ground speed takeoff: https://www.youtube.com/watch?v=Kd7_V4pW--Q

::I think the confusion here is that yes, it can land vertically: for that matter, so can any airplane. What matters isn't ground speed but airspeed, and as long as there's as much headwind as the landing airspeed of the aircraft, it will land vertically. Now, with fixed wing airplanes the landing speed is at least 40-50 mph, and you don't often find headwinds like that. The much lower landing airspeed of an autogyro makes that feasible. [[User:Gbisaga|Gbisaga]] ([[User talk:Gbisaga|talk]]) 21:26, 26 March 2018 (UTC)

::: "Landing vertically"...having so little forward airspeed on touchdown that it is negligible[[Special:Contributions/108.162.216.208|108.162.216.208]] 23:40, 26 March 2018 (UTC)
:::: I disagree with this. If that were the case, an autogyro could NOT land vertically or anything close to it. I think it's clear that "vertical" refers to movement relative to the ground, as movement relative to airflow is invisible. I'm having a hard time finding hard numbers on minimum airspeed for an autogyro (and unlike fixed wing aircraft, I've never flown one myself, so I don't have practical experience to fall back on). However I've seen a typical autogyro's best rate of climb speed is 50-50 mph, versus almost 70 for a 152; so I'll project about 30 mph for a minimum speed in landing configuration. Landing in that kind of headwind is certainly not unreasonable (though it would probably be not that much fun). [[User:Gbisaga|Gbisaga]] ([[User talk:Gbisaga|talk]]) 12:56, 27 March 2018 (UTC)

::: I'd expect an autogyro to be capable of landing the same way a helicopter with an engine malfunction lands - autorotate the rotor to store energy and then stop while relying on the rotor to slow the descent. Does not sound like the safest of procedures, but it certainly gives you a vertical landing. [[User:Mat|Mat]] ([[User talk:Mat|talk]]) 08:30, 27 March 2018 (UTC)

::: Doesn't the downward motion of the autogyro during descent contribute to the autorotation of the rotor, thereby providing lift while descending even through air that is calm laterally? [[Special:Contributions/162.158.154.43|162.158.154.43]] 14:29, 27 March 2018 (UTC)

Thanks for the comments, guys. I'm not the original commenter, but I had a [https://i.imgur.com/52JZlwf.png severe misunderstanding] of what "landing vertically" meant. [[Special:Contributions/172.68.26.71|172.68.26.71]] 13:54, 27 March 2018 (UTC)

;Cannot hover?

I would assume that autogyros ''can'' hover in some conditions (i.e. in a headwind). This is the same argument as the one for "Land Vertically?"; namely that it's the wind that matters. Is Randall wrong here or is this just an impractical edge case? Here is a [https://www.youtube.com/watch?v=DU7uAEvV_PU YouTube video] [[User:Kosak2000|Kosak2000]] ([[User talk:Kosak2000|talk]]) 15:58, 27 March 2018 (UTC)

:It can ''hover'' in the sense that any fixed wing airplane can hover - by having a fast enough headwind. I've "hovered" in a Piper Cub before - even flown backward! But that isn't the conventional use of "hover" by aircraft pilots. Hover it meant to refer to purposeful powered flight over a stationary spot 'with no wind'. Such as a Helicopter can do. An autogyro cannot do this, as it must maintain forward movement (compared to the air) to maintain lift. However, with some "trick piloting," you ''can'' vertically land an autogyro. You're not hovering because you're not holding your altitude, but if you come in with some forward speed and high-ish descent rate, you can flare a few feet above the ground to a horizontal stop, turning your formerly forward speed in to slowing the descent rate to an acceptable descent rate to land at. [[Special:Contributions/172.68.174.94|172.68.174.94]] 03:21, 28 March 2018 (UTC)

;Trivia
First successful flight of an autogyro was in 1923, so they have been around for close to 100 years. [[User:Rtanenbaum|Rtanenbaum]] ([[User talk:Rtanenbaum|talk]]) 17:04, 26 March 2018 (UTC)
The 1981 movie ''Mad Max II'' prominently featured an autogyro as part of the action. [[User:Rtanenbaum|Rtanenbaum]] ([[User talk:Rtanenbaum|talk]]) 17:04, 26 March 2018 (UTC)
Also James Bond 007 flew the autogyro 'Little Nellie' in " You Only Live Twice". Reputedly prompting a bit of an autogyro revival. [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 17:46, 26 March 2018 (UTC)

First of all, I've converted section headings to bold labels - we should avoid them in discussion content. Secondly, my take on how to order the labels around the autogyro is down the left side, then across the top, and finally down the right side. I realize it's entirely up to the reader, but that order makes the most sense to me instead of clockwise - the text on the lower-right seems to be climactic in a strange Randell-esque way. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 18:15, 26 March 2018 (UTC)
:Agree with your entire comment, and have changed the order in the transcript --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 20:03, 26 March 2018 (UTC)

Has Megan been seen wearing goggles before? [[User:Herobrine|Herobrine]] ([[User talk:Herobrine|talk]]) 23:05, 26 March 2018 (UTC)

"Powered parachute"? Sounds to me like [https://en.wikipedia.org/wiki/Paramotor this awesome thing]. [[User:Fabian42|Fabian42]] ([[User talk:Fabian42|talk]]) 08:50, 27 March 2018 (UTC)
:It's actually [https://en.wikipedia.org/wiki/Paraplane this similar awesome thing] and I've updated the main descriptions to link there. [[User:N0lqu|-boB]] ([[User talk:N0lqu|talk]]) 20:14, 27 March 2018 (UTC)

;Section Headings
Re-converted section headings to bold labels in discussion content - please avoid re-adding them because they can interfere with auto-layout templates in the explainxkcd page system. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 17:04, 27 March 2018 (UTC)

Talk:1919: Interstellar Asteroid

2017-11-22T05:35:49Z

172.68.174.94:

Let's see:

* Long and thin.
* From another solar system.
* Made mostly of metal.
* Spinning to create artificial gravity.

...yeah - could be anything really! [[Special:Contributions/173.245.50.102|173.245.50.102]] 05:16, 22 November 2017 (UTC)

Has he ever referenced Weird al before? [[Special:Contributions/172.68.174.94|172.68.174.94]] 05:35, 22 November 2017 (UTC)

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Talk:2016: OEIS Submissions

Talk:1972: Autogyros

Talk:1919: Interstellar Asteroid