Talk:Helicopter

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Aviation: Rotorcraft

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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)

No mention of the Autogyro?

There is no mention of the Autogyro in the lead. The autogyro invented by Juan de la Cierva in 1923 is the predecessor of the modern helicopter. — Preceding unsigned comment added by 83.47.127.58 (talk) 16:28, 28 December 2021 (UTC)[reply]

The only mention of any history in the lead is the first helicopter in 1907, while autogyro came a couple of decades later. While de la Cierva's work was important in the evolution of the helicopter, other pioneers such as Sikorsky aren't mentioned either. BilCat (talk) 21:26, 28 December 2021 (UTC)[reply]

Sikorsky is Ukrainian not Russian

He was born in Kyiv during Russian occupation, that doesn't mean he is russian! — Preceding unsigned comment added by 80.112.162.125 (talk) 08:33, 24 June 2022 (UTC)[reply]

See Talk:Igor Sikorsky for discussions ad nauseum on why Russian is used. BilCat (talk) 08:58, 24 June 2022 (UTC)[reply]

When Sikorsky lived there it was part of the Russian Empire and not separate nation. Per MOS:ETHNICITY nationality can be listed in the Lead, but "Ethnicity ... should generally not be ..." -Fnlayson (talk) 15:49, 24 June 2022 (UTC)[reply]

Semi-protected edit request on 30 June 2022

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Sykorskyi was not russian, he was ukrainian 188.163.108.123 (talk) 10:37, 30 June 2022 (UTC)[reply]

Not done: See above. ScottishFinnishRadish (talk) 10:50, 30 June 2022 (UTC)[reply]

Birth of an industry in wrong place?

The section 'Birth of an industry' appears to start with the twilight of the gyrocopter derived designs.

Sikorsky's novel single rotor design was the first helicopter as we know them today, and the first to be mass produced. It would seem to be the appropriate point for the start of the new section. 88.87.126.220 (talk) 09:39, 3 August 2022 (UTC)[reply]

Transmission and electric drives and quadcopters?

The Transmission section identifies mechanical gearboxes as a major source of problems. It also notes that electric-magnetic transmission is more reliable in this respect.

But perhaps there should be a clearer explanation of how and why electric 'helicopters' are typically quadcopters...or more to the point why the advantages of multiple rotors have not been popular on mechanical transmission designs.

Over the last few years several people have asked me why conventional helicopters don't use quadcopter layouts like drones...and visa-versa. 88.87.126.220 (talk) 09:44, 3 August 2022 (UTC)[reply]

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

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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]