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Your feedback is requested at Talk:Chronic fatigue syndrome on a request for comment. Thank you for helping out! You were randomly selected to receive this invitation from the list of subscribers. If you'd like not to receive these messages any more, you can opt out at any time by removing your name.

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I moved your comment to the Ideal Gas talk page and responded there. But if you are sure that you are correct then remove or better clarify my comment for both ideal gas and the ideal gas law. Thanks. Tuntable (talk) 09:58, 30 June 2020 (UTC)Reply[reply]

If you want to restore that trolling question, go ahead. ←Baseball Bugs ^{What's up, Doc?} carrots→ 13:52, 21 August 2020 (UTC)Reply[reply]

I have done so. See the diff. Dolphin (t) 02:13, 23 August 2020 (UTC)Reply[reply]

And now you can go complain to the editor who reverted you 8 minutes after you restored it. ←Baseball Bugs ^{What's up, Doc?} carrots→ 10:58, 23 August 2020 (UTC)Reply[reply]

I saw your sandbox essay. Here's the thing: I was advised a long time ago to make as minimal a fuss as possible when reverting trolls. Hence the edit summaries of "wp:deny" and nothing else. Any more than that does nothing but feed the trolls. ←Baseball Bugs ^{What's up, Doc?} carrots→ 20:36, 24 August 2020 (UTC)Reply[reply]

I can understand your frustration Dolphin51, it's a shame that the contributions of those editors were deleted. The troll was obvious though and it was necessary to remove the post, so as to deny the troll any more attention. No one is to blame but the troll. I hope you can see it for what it is. That RfC about medical advice is a separate matter. Regards, Zindor (talk) 22:10, 24 August 2020 (UTC)Reply[reply]

Thanks Zindor. I appreciate your edit. You will always be welcome here so drop by any time! Dolphin (t) 00:48, 25 August 2020 (UTC)Reply[reply]

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Are you sure that you have to do another five hour flight? I have never heard of this, despite being an Official Observer for many years. I was certainly awarded my Gold Badge without have to do another one. There was a case of someone, who had flown both the 300km and made 3000 metre gain, not being awarded the Gold Badge until a five hour flight had been done. But only one flight was needed. JMcC (talk) 09:44, 8 October 2020 (UTC)Reply[reply]

Thanks for drawing that to my attention. I included the word "another" as part of my interpretation of the requirement. I was relying on Reference No. 53 and it doesn't imply that a second 5-hour flight is required. I have amended the article to eliminate my error. Dolphin (t) 12:14, 8 October 2020 (UTC)Reply[reply]

I do not understand the full revert. The removed information is relatively unimportant but can certainly be kept if anyone wants it. The problem is the description section which seems to be a major improvement. Is there any reason that the description section should not be upgraded? Benjamin Trovato (talk) 06:31, 11 October 2020 (UTC)Reply[reply]

Hello @Benjamin Trovato: I assume you are referring to the revert made in this edit: diff. That edit was made by User:Dl2000, not by me.

My edit was made after the deletion by Dl2000 - see my diff. Regards. Dolphin (t) 11:47, 11 October 2020 (UTC)Reply[reply]

Ouch, my fault. Sorry to waste your time. Benjamin Trovato (talk) 04:46, 12 October 2020 (UTC)Reply[reply]

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	The Random Acts of Kindness Barnstar
	Thank you for the warm welcome. TechnoX13 (talk) 19:31, 10 December 2020 (UTC)Reply[reply]

It is my pleasure. Don't forget I'm always available to help you navigate your way around Wikipedia; no question is too dumb. And thank you for the barnstar! Dolphin (t) 01:29, 11 December 2020 (UTC)Reply[reply]

Hi Dolphin51! I just wanted to thank you again for all you do here. I wish you a very Merry Christmas, or whatever holiday you celebrate, and may the coming year bring you much happiness and joy. May it at least be better than this one. Merry Christmas and Happy New Year! Zaereth (talk) 00:26, 24 December 2020 (UTC)Reply[reply]

Thank you Zaereth! My best wishes to you too. Yes, I think everyone is looking forward to 2021 being a better year than the current one. Dolphin (t) 13:06, 25 December 2020 (UTC)Reply[reply]

Hi, I saw your comment on Tony's page. It will be interesting to see what he says. I think "that" is almost always redundant in the context of "he saw that" "she said that" "she thought that". Graham Beards (talk) 10:34, 12 March 2021 (UTC)Reply[reply]

Thanks Graham. I agree it will be very interesting to read Tony’s thoughts. I appreciate your message, and your support. It is always encouraging to discover that we aren’t the only User to hold a particular view! Dolphin (t) 10:46, 12 March 2021 (UTC)Reply[reply]

You know, I saw this and it grabbed my interest too, because linguistics (and in particular the history of English) is an interest of mine. At first I thought you were talking about "that that", which is a personal pet peeve of mine, as you can see here. That's one that is truly redundant in nearly all cases.

I too was interested in what Tony would say, because he's a lot smarter than I am in this area. Turns out, it was basically what I was thinking too, in that, when used in that way it's a conjunction indicating a subordinate clause. There may be instances where it's unnecessary, but you have to look very carefully at how removing it affects the meaning of the sentence. Sometimes it's just idiomatic, but sometimes it is used to distinguish between the clause as part of the sentence and a different meaning it takes on when separated from the sentence. Sometimes an alternative is to replace the "that" with a comma, and that can sometimes work. You just have to watch carefully for those dual meanings that can crop up. The same thing can occur with other conjunctions, adverbs and adjectives. "In order" (as in "in order to") is a good example. Most of the time it's not necessary, but there are occasions where it is very much is. Anyhow, sorry to ramble, but maybe something in there might help. Zaereth (talk) 01:10, 13 March 2021 (UTC)Reply[reply]

Thanks Zaereth, I appreciate your message. Tony has replied and it has given me a new insight into the problem. My most recent erasure of a redundant “that” was about 4 days ago to the article Jeremy Corbyn. Let me know what you think of it. (Sorry I can’t post the diff; I am presently relying on an iPad and I don’t know how to harvest diffs on an iPad.) Dolphin (t) 02:06, 13 March 2021 (UTC)Reply[reply]

Absolutely: that Corbyn "that" needed zapping. Tony (talk) 00:13, 14 March 2021 (UTC)Reply[reply]

Angle of attack caption fixed. Thanks Pi3.124 (talk) 12:44, 13 March 2021 (UTC)Reply[reply]

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Hi Dolphin51. I saw this edit you made here. Just for reference, the link syntax [[:User:XXX]] works similarly to user notification templates per WP:PING; so, there was really no need to make the change you made. Whether the IP realized this when they made that particular post is unknown, but the "ping" probably still worked. In addition, converting the syntax to the ((u)) template the way you did wouldn't have had the desired result because the "ping" syntax needs to be added with a signed post in the same edit per H:PINGFIX in order for the software to know it's supposed to ping someone. Finally, while I do understand the reasons for making such a change, there are cases where an editor might be mentioned in a post but has intentionally not been pinged by the person doing the posting for whatever reason. So, maybe in such cases involving posts made by others, it would be better to use either a ((Please see)) template to inform someone that they've been mentioned or simply post a new post pinging them that you can sign if you feel they should be notified. -- Marchjuly (talk) 23:27, 3 May 2021 (UTC)Reply[reply]

Marchjuly Thanks for that information. I tinkered with your ping because I recalled (inaccurately) this edit. I should have rechecked the details! Dolphin (t) 12:29, 13 May 2021 (UTC)Reply[reply]

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Thank you for expanding the glossary!107.77.192.219 (talk) 18:00, 13 September 2021 (UTC)Reply[reply]

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Hi Dolphin51! I just wanted to say thanks for all you do for Wikipedia, in science, fluid dynamics, and energy-related articles especially. I hope you have a wonderful holiday season, and may the coming year bring you great joy and good fortune. And, if you don't celebrate Christmas, then please take it as a Happy Hanukkah, a great Dhanu Sankranti, a blessed Hatsumode, or whatever holiday you want to insert there. Zaereth (talk) 23:26, 24 December 2021 (UTC)Reply[reply]

Hi Zaereth! Thank you for your season greetings, and best wishes to you too. I’m hoping that 2022 is a bit more normal than the current one. Dolphin (t) 07:01, 25 December 2021 (UTC)Reply[reply]

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Hi Dolphin,

I saw your edit on the slip article, and I agree is should be removed. What I think the author was trying to describe there was crabbing, which is not correcting a course with a slip, but rather using a slip at the last second to align the plane with the runway. For example, when you land on an aircraft carrier, not only is the carrier still moving forward, plus rocking and pitching, the runway is at an angle to the line of approach and glide slope, so you have to crab the aircraft to line it up with the landing strip just before touchdown. Aside from fighter planes, this is something all aircraft have to do while landing in a crosswind. I think the article could probably benefit by describing crabbing. Perhaps when I have more time I'll work on that ... with far better sources that youtube of course Zaereth (talk) 21:32, 11 April 2022 (UTC)Reply[reply]

Thanks Zaereth. You say “this is something all aircraft have to do while landing in a crosswind.” I would agree if you change that to “all aircraft have to do when touching down in a crosswind.”

During the approach to land in a crosswind, the aircraft can be in balanced flight so the pilot sees the bubble in the centre of the balance indicator, although the runway will be slightly to the left or right of the aircraft centreline. If the pilot is to avoid scrubbing the main wheels on touchdown it is necessary to use the rudder to “straighten up” moments before touch down; or crossing rudder and ailerons to align the centreline of the aircraft with the runway by slipping or crabbing sideways in the seconds before touch down. Dolphin (t) 22:17, 11 April 2022 (UTC)Reply[reply]

Yeah, that's a better choice of words. Zaereth (talk) 22:48, 11 April 2022 (UTC)Reply[reply]

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New article at Newton's sine-square law of air resistance. Would appreciate comments, corrections, and improvements. Thanks. Mr. Swordfish (talk) 19:01, 12 June 2022 (UTC)Reply[reply]

Thanks for starting this new article. I have added some citations to Anderson's Fundamentals of Aerodynamics. Dolphin (t) 12:37, 13 June 2022 (UTC)Reply[reply]

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Apologies if this isn't the right place for this. If so do please let me know, I find the navigation very confusing.

You reverted an edit which I made, saying that what I described was only a thought experiment.

No problem if I've violated the requirements but I'd have to take issue with "thought experiment". I did this personally in a physics lesson on the playing fields at Swanwick Hall Grammar School in 1964 when I was eleven years old. Perhaps I should find the physics textbook in use by the school at that time to give as a reference? However after almost 60 years I can't even be sure that the method is described in it. :)

Ged Haywood (talk) 14:01, 27 September 2022 (UTC)Reply[reply]

Ged Haywood Thanks Ged. My Talk page is a satisfactory place to make your comment. However, I have duplicated your comment on the Speed of sound Talk page - see Talk:Speed of sound#Measurement of speed of sound so that other interested Users can join in if they wish. I will answer there. Cheers! Dolphin (t) 11:52, 28 September 2022 (UTC)Reply[reply]

Is there no room in a scientific perspective on the vortex for an artistic movement devoted to the same dynamics? Jamesmcardle^(talk) 12:14, 27 October 2022 (UTC)Reply[reply]

Jamesmcardle Thanks for raising the matter on my Talk page. Guidance is provided at MOS:SEEALSO which implies that a blue link to another page qualifies for inclusion at “See also” if it is clearly relevant to the article, or a sound argument can be made that it is relevant. I don’t think “vorticism” is clearly relevant to fluid dynamics and therefore you should explicitly provide your sound argument as to why you think it is relevant. You could make your case at Talk:Vortex so that other Users interested in fluid dynamics can see your ideas, comment and put forward their own ideas.

If a reader is using Wikipedia as a dictionary and looking for words similar to “vortex”, that reader might end up looking at the “See also” section in Vortex. However, Wikipedia is not a dictionary. If a reader is using Wikipedia correctly, that reader will be reading Vortex to obtain information about fluid dynamics and the science behind the physical phenomenon known as a vortex. That reader is unlikely to be looking for Wikipedia’s articles about art and artistic movements, but I could be wrong. Dolphin (t) 13:44, 27 October 2022 (UTC)Reply[reply]

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Hi Dolphin51. I just wanted to take this time to say thanks for all you do around here. I hope you're doing well on this cold winter's day. I wish you and yours a very Merry Christmas, and a Happy New Year. Zaereth (talk) 20:15, 25 December 2022 (UTC)Reply[reply]

Thanks Zaereth. I send you my best wishes this festive season too!

Regarding the cold weather, I live in Australia and the forecast maximum temperature today is 29 deg C so keeping warm won’t be a problem! Regards, Dolphin (t) 20:32, 25 December 2022 (UTC)Reply[reply]

An article that been involved with (George Pell) has content that is proposed to be removed and moved to another article (Name to be decided). If you are interested, please visit the discussion. Thank you. _MB190417_ (talk) 14:06, 12 January 2023 (UTC)Reply[reply]

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I'm a commercial pilot trying (for medical reasons) to calculate the pressure gradients between various low levels of altitude change to establish scientifically whether, and by how much, the pressure differences are greater at lower levels (nearer the ground) than the differences higher up for the same altitude change (please see my discussion title) as I understand the vertical gradient to be exponential rather than linear. Can you help me with the calcs please? Many thanks indeed, Dave UK Dmlewins (talk) 09:12, 10 March 2023 (UTC)dReply[reply]

Hi Dave. I’m willing to try to help.

The vertical pressure profile is definitely not linear. (It is worth noting that the vertical temperature profile IS linear. The temperature gradient is constant: 6.5 deg C per 1000 m or approx 1.98 deg C per 1000 ft.)

Yes, the vertical pressure profile varies exponentially. Some of the math is available at Barometric formula.

It is likely that your purposes can be served by reading pressures and altitudes from a table of the standard atmosphere. (I don’t have a paper table close at hand so I went to International Standard Atmosphere#External links and used the “Digital Dutch” online calculator given as the first of the external links.)

altitude sea level – pressure 1013.2 hPa

altitude 2,000 feet – pressure 942.1 hPa

difference 71.1 hPa or gradient of 35.6 hPa per 1,000 feet

altitude 4,000 feet – pressure 875.1 hPa

difference 67.0 hPa or gradient of 33.5 hPa per 1,000 feet

altitude 6,000 feet – pressure 812.0 hPa

difference 63.1 hPa or gradient of 31.5 hPa per 1,000 feet

altitude 8,000 feet – pressure 752.6 hPa

difference 59.4 hPa or gradient of 29.7 hPa per 1,000 feet

altitude 10,000 feet – pressure 696.8 hPa

difference 55.8 hPa or gradient of 27.9 hPa per 1,000 feet

I hope the above information is helpful. Dolphin (t) 11:13, 10 March 2023 (UTC)Reply[reply]

Hi Dolphin 51, that's really helpful thanks very much!

You say though that the pressure gradient isn't linear (which I'm glad to hear), but then state what seems to be a linear relationship in the calc for the first low level altitude block of 35hpa or so per 1000'. How do I calculate the different gradients in the higher blocks? Fyi I'm trying to prove that the pressure difference per 1000' is much(?) less at 6000 and 8000'and less still at 10000'. Is this the case and if so by how much? Thanks again! 🙏 Dmlewins (talk) 10:57, 10 March 2023 (UTC)Reply[reply]

Doh sorry I've just seen your further reply thanks ever so much! 🙏 🙏 Dmlewins (talk) 10:58, 10 March 2023 (UTC)Reply[reply]

That's really helpful thanks very much indeed. I'll let you know how I get on! ATVB, Dave Dmlewins (talk) 11:16, 10 March 2023 (UTC)Reply[reply]

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The advancement to Distinguished Professor was a terrific honor, thank you for your kind comments. Remarkably, when I tried to respond to you a couple days ago, I found my IP was blocked due to a number of abuse notifications, though as you note I have not logged in for over a year. I have never appealed a block before, so it took me several attempts to get it right, and by then I was halted for spamming the request system. In any case, you have reminded me why it is nice to be back. Prof McCarthy (talk) 19:13, 22 May 2023 (UTC)Reply[reply]

I agree that it is frustrating to be swept up in an IP-wide block. It happened to me a few years ago. Thank you for your acknowledgment, and welcome back. Dolphin (t) 22:22, 22 May 2023 (UTC)Reply[reply]

I'm getting there. It's a bit slow as I can't force it. I have to wait patiently for a light bulb to go on, then go looking for supporting material.Pieter1963 (talk) 00:13, 20 June 2023 (UTC)Reply[reply]

No problem Pieter! It’s a big topic - I know, I attempted to save the article about 15 years ago. Thanks for letting me know. Dolphin (t) 00:28, 20 June 2023 (UTC)Reply[reply]

I'm still moving ahead slowly in fits and starts, no loss of enthusiasm though. I keep massaging what I've already done as well as coming up with new angles. I knew I'd find putting something together from scratch would be difficult although it's all very basic and, I think, interesting.Pieter1963 (talk) 01:07, 17 August 2023 (UTC)Reply[reply]

Thanks Pieter! I applaud your enthusiasm. There is no rush. Keep going! Dolphin (t) 09:26, 17 August 2023 (UTC)Reply[reply]

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Hello, could you add the Czech Republic to the f-35 users in the f-35 article. The Czech government approved the purchase of 24 f-35s a few days ago. 193.165.236.247 (talk) 12:24, 3 October 2023 (UTC)Reply[reply]

I transferred your request to Talk:F35#Czech Republic. Dolphin (t) 13:14, 3 October 2023 (UTC)Reply[reply]

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I have a question about contrails that maybe you can answer. I asked Siri but she was no help...so I came to my old friend Wikipedia. The other day in the skies above central Illinois I witness a contrail that veered quite noticeably to the right. I didn't think much about it at the time and only watched for a minute or two and went about my business. But, later, I realized that in 60 years of watching the sky and cloud formations and thousands of contrails (I'm an artist) I had never seen any turn at all...always straight as an arrow. This drastic turn was peculiar. It was most likely just a change of course by the aircraft but it was so severe it defied my possible explanations. Thanks in advance for any explanation and Happy Holidays to you and yours.Buster7 (talk) 14:39, 17 December 2023 (UTC)Reply[reply]

Hi Buster7. Sorry to butt in, but since I have this page on my watchlist I thought I'd give my two cents. In my experience, contrails can move due to things like air currents and jet streams, but somehow I get the feeling that's not what you're describing. Normally, when flying, the goal is to get from Point A to Point B in the shortest distance possible, that is, "as the crow flies". So when you see the high-altitude contrails of most commercial airliners they're typically going in very straight lines.

Perfect in theory, but as Yogi Berra once said, "In theory, there is no difference between theory and practice. In practice, there is." Other countries often don't like us flying over their airspace, and visa versa. Military bases don't like commercial planes flying over them, etc. So you end up with a lot of no-fly zones and corridors where travel is permissible. These become like highways, or airways, in the sky. For example, in the continental US, you'll most likely see contrails that are mostly moving in perfectly straight lines because these air lanes are long and wide. In Alaska, however, we have relatively narrow corridor here where planes are coming over the top from Europe and east from Asia. Anchorage serves as one of those landmarks to such planes that says, "Change course here." Thus, over Anchorage it's quite common to see a contrail turn where the plane did.

Now, a commercial plane is not likely to make any sudden turns. Passengers and cargo, not to mention the planes, don't like those. Even so, at cruising altitude of 30,000 feet (5 1/2 miles), to a person on the ground the turn will look a lot tighter than it is.

Military craft, of the other hand, can and do often make very tight turns, which from cruising altitude may appear as almost sharp angles. These are often not bound by the typical FAA regs and quite often fly above controlled airspace. With them, you neve know why they do what they do, but more than likely they have their turns all mapped out on a flightplan, or they're being guided somewhere by their controllers. (Or on rare occasion they may just be out having fun.) That's my best guess to try and describe what you saw. We can probably rule out UFOs, because those are notorious for not leaving any contrails. But perhaps Dolphin51 will know more about it than I. For a funny video about it, see: https://www.youtube.com/watch?v=ILop3Kn3JO8 Zaereth (talk) 21:18, 18 December 2023 (UTC)Reply[reply]

Hi Buster7. I generally agree with everything Zaereth has written. Two aspects of your description are significant:

1. This was the first time you have witnessed this occurrence so it is not a case of all aircraft on this course have to skirt around the corner of a control zone to avoid some no-go area, or to avoid leaving the protection of controlled airspace.
2. You could see the contrail so poor weather is unlikely to be a contributing factor.

One possibility is that this was a military aircraft, possibly on a training flight. A training flight could involve the crew planning to fly to Base A, but then being given a simulation of a mid-flight emergency that requires the crew to investigate all options and divert to the best alternate Base. Dolphin (t) 01:38, 19 December 2023 (UTC)Reply[reply]

@Zaereth Thanks buddy. That was fun!. @Dolphin51. Spent a week in San Luis Obispo Mexico. Whale watching. Dolphins were abundant and friendly !Buster7 (talk) 05:36, 19 December 2023 (UTC)Reply[reply]

You're welcome. One way to think about it is that flying is usually done from point to point. In the old days it was visually, from landmark to landmark, but today those landmarks have largely been replaced by navigational radio beacons. Either way, ideally you want to go directly from point A to B, but sometimes you end up needing to turn at Point C, D, and E in between. Emergencies happen and you suddenly have to divert to the nearest cornfield. Only the pilot really knows. (The old pilot's proverb says, "You've never been lost until you been lost at mach 2.") Zaereth (talk) 21:22, 19 December 2023 (UTC)Reply[reply]

Merry Christmas Dolphin51! Glad to see you're still around after all these years. I just wanted to stop by and wish you and yours a Merry Christmas! And, as always, if you don't celebrate Christmas, then take it as a Happy Hanukkah, a Blessed Hatsumode, or (my personal favorite) a hard-partying Viking Yule (which is what it is anyway), or whatever holiday you wish. If nothing else, have a great Sunday, and may the coming New Year be clear and a million with a good tailwind. Zaereth (talk) 21:46, 19 December 2023 (UTC)Reply[reply]

Hi Zaereth! Thank you for your season’s greetings. I send my greetings to you and your family too.

I’m pleased to see the dolphins around San Luis Obispo are friendly. I have had a few great experiences travelling across open water in a boat, and was delighted to watch the number of dolphins racing beside the boat in the bow wave. How cool is this! Dolphin (t) 20:27, 23 December 2023 (UTC)Reply[reply]