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This is an old revision of this page, as edited by CapnZapp (talk | contribs) at 12:32, 20 September 2023 (→The reasons for heli- and -copter). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Torque

The article states "Most helicopters have a single main rotor, but torque created by its aerodynamic drag must be countered by an opposed torque."

This is factually incorrect. The torque is not created by aerodynamic drag, it's the result of an equal and opposite reaction force (Newton's Second Law). It happens in a vacuum. Spacecraft have reaction wheels for attitude control that work on this principle. — Preceding unsigned comment added by 146.90.76.143 (talk) 17:29, 8 July 2023 (UTC)[reply]

Sorry, I've thought about this some more. There are at least two main effects here. There is conservation of angular momentum purely in the rotation of the blades and the body of the helicopter plus there is the equal and opposite reaction to the continued "pushing" of the blades against the air.
As the angular speed of the rotors changes (e.g. from rest to spinning) their angular momentum changes and the tail rotor has to exert an equal and opposite thrust to compensate.
When the helicopter is in flight, as the article correctly states, there is aerodynamic drag on the blades (as with aeroplane wings) which the engine must push against. Since the blades rotate, this manifests as a torque, for which the tail rotor must compensate. 87.115.6.239 (talk) 09:57, 20 August 2023 (UTC)[reply]

Experimental helicopter by Dr. Boothezaat in 1923

I'm reading through old Time Magazine issues. The March 1923 issue discusses Thomas Edison sending Dr. Boothezaat a congratulations for a test of a helicopter by remaining in the air for 2 min 45 sec at a height of 15 feet. Also see https://time.com/vault/issue/1923-03-03/page/23/. — Preceding unsigned comment added by Noloader (talk • contribs)

Sikorsky was born in Ukraine!

Dear author of the article. You dare to write about the history of the invention of helicopters devaluing the name of their inventors. You wrote the story of Sikorsky guided by Russian imperialism. it is the same as if Great Britain still claimed India or the USA, devaluing the peoples who live there. Sikorsky was born in Ukraine in 1889. Even if you dared to say that Ukraine was the USSR (and this would be a gross violation of international law and evidence that you don't understand the meaning of the word "union"), the USSR still began to exist in 1922. I ask you to immediately correct the information in article. Thanks for understanding. — Preceding unsigned comment added by 37.170.45.172 (talk) 09:06, 24 August 2022 (UTC)[reply]

Semi-protected edit request on 10 November 2022

Please include include the following additions in the History, "early development" section.


Spanish civil engineer and pilot Juan de la Cierva-Codorníu invented the autogiro or girocóptero (autogyro) in the early 1920s, becoming the first practical rotorcraft. On July 1, 1920, de la Cierva applied for his first patent, no. ES 74 322, at the Spanish Patent and Trademark Office presented as “New Aviation Machine” (*).

The first C1 model was built in Pablo Díaz's workshop in Getafe (Madrid, Spain) and tested for the first time in October 1920 by the pilot Captain Felipe Gómez-Acebo. However, the test was not completely satisfactory since, although the rotors entered autorotation, one of them did so at a lower speed (*). In 1921 de la Cierva successfully flew a reduced model at the Buen Retiro park in Madrid in the presence of engineer and President of the Spanish Republic Emilio Herrera (*Wikipedia*). In that same year another test flight of the new C-3 model took place and in 1922 the C-2 model was tested. Both C-2 and C-3 presented stability problems, contrary to the model tested at the Buen Retiro Park.

Finally, de la Cierva found the problem in the stiffness of the blades, which he resolved by including a horizontal joint attached to each of the blades in the C-4 model, which made a successful test flight by the experienced pilot Alejandro Spencer on January 10, 1923, being able to take off, fly and land vertically. On the following January 31, the C-4 circled about four kilometers at more than 25 meters high.

In 1934, in a conference during his last stay in Madrid at the Escuela Superior Aerotécnica, Madrid, de la Cierva proposed the study of the solutions of the differential equation that arises when studying the possible oscillations of the autogyro blades, characterized by the variation of the deviation angle (height or depression) (***). Professor Puig-Adam, in collaboration with his students and using Runge's numerical methods and Meissner's graphs, solved the equation, as described in his book "Theoretical and practical course of differential equations applied to physics and technology", confirming what de la Cierva had intuitively predicted (****)

(*) Spanish Patent and Trademark Office, https://www.oepm.es/export/sites/oepm/comun/documentos_relacionados/Publicaciones/monografias/juan_de_la_cierva_esp.pdf (**) "Juan de la Cierva Codorníu, inventor del autogiro (1895-1936)", Dr. Ricardo de la Cierva y de Hoces, professor of World Contemporary History, University of Alcalá de Henares, Spain, https://digital.march.es/fedora/objects/fjm-pub:462/datastreams/OBJ/content (***) Sobre la estabilidad del movimiento de las palas del autogiro, Khatarsis Magazine, Antonio Senyé-Pocino, 2008, https://revistaliterariakatharsis.org/DE_LA_CIERVA.pdf (****) Curso Teórico Práctico de ecuaciones diferenciales aplicado a la Física y Técnica, two volumes, Pedro Puig-Adam, 1958, Escuela Técnica Superior de Ingenieros Industriales, Madrid.


There are a lot of pictures to include: https://www.vuelalo.es/historia-del-autogiro PolasBear (talk) 09:20, 10 November 2022 (UTC)[reply]

 Not done for now: please establish a consensus for this alteration before using the {{Edit semi-protected}} template. BilCat (talk) 11:05, 10 November 2022 (UTC)[reply]

Denny Mumford Helicopter

First took to the air in 1912. Should be included IMHO. See for example https://www.flickr.com/photos/scottishmaritimemuseum/4967275889/ 2A00:23C6:F983:2C01:9084:90A6:89CC:E852 (talk) 12:44, 6 December 2022 (UTC)[reply]

Trouve electric helicopter

The Trouve helicopter is discussed in detail in Octave Chanute's Progress in Flying Machines. It was tested by mounting on a seesaw-like pivot. It rose, but the power was supplied to the motor through the conductive pivot. It did not carry its power source with it. Roquefortcheesecake (talk) 08:59, 9 December 2022 (UTC)[reply]

NASA Mars helicopter

This paragraph needs updating to reflect the fact that the NASA Mars helicopter (Ingenuity) has successfully flown many missions on Mars. Pawprintoz (talk) 00:57, 9 January 2023 (UTC)[reply]

The reasons for heli- and -copter

The source is not available online and is in French.

And so I got curious: what are the reasons why the word isn't analysed helic- and -pter?

I'm assuming the source goes into some detail. Or, if you have another source discussing heli- and -copter?

CapnZapp (talk) 16:24, 18 September 2023 (UTC)[reply]

Probably because that is how it's pronounced in English. We say "heli-copter", not "helic-opter", which is difficult for most native English speakers to say. BilCat (talk) 19:53, 18 September 2023 (UTC)[reply]
It appears you believe you have adequately answered the issue, but you did so by posting an unsourced speculation here on the talk page while removing context for the reader on the actual article page. If you are unsure what my issue is, feel free to ask. Otherwise I will assume you understand full well what made me start this talk section, User:BilCat, and I invite you to actually fix it on the article page. Thanks CapnZapp (talk) 18:00, 19 September 2023 (UTC)[reply]
Look it up in an English dictionary, and see how the syllables are divided. But to be honest, your questions here are straying into WP:FORUM territory, and are really beyond the scope of a generalist encyclopedia. If you can find a reliable source that discusses why "helicopter" is not analyzed as "helic-opter", then you might be able to add it to the article, if it can be shown to relevant to the topic. BilCat (talk) 20:19, 19 September 2023 (UTC)[reply]
You keep assuming I am asking for my sake. Please stop doing so. I am asking in order to highlight there is an opportunity to improve the page. Please stop explaining and answering to me here on talk - instead consider answering by improving our article. That's the end goal here. So please assume your fellow editors understand the purpose of this talk page rather than assuming they confuse it for WP:FORUM. Thanks CapnZapp (talk) 12:32, 20 September 2023 (UTC)[reply]
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