User talk:Alex M. Volz

Akaflieg
Alex would you try to explain what you mean by "bent wing"? Do you mean like a Minimoa? JMcC (talk) 16:27, 22 November 2007 (UTC)


 * Just describe in simple English what these two characteristics of wings look like and I will think of a way of saying it in English. I still do not know what you are trying to say. (I fly an ASW27 from Lasham Airfield and in July each year I go to the Alps to fly from Sisteron.) JMcC (talk) 17:56, 22 November 2007 (UTC)


 * Yes, exactly, something like Minimoa, perhaps "kink-wings", the German word is "Knickflügel". Drawn on aerodynamic theory they hoped on a better lateral stability. In this form today obsolet.


 * Yet a comment to your article "Schempp-Hirth Discus". You wrote: "Studies had long shown that the ideal wing for minimizing induced drag should be an elliptic planform". Correct would be, not the planform should be elliptic for minimizing induced drag, but the lift-allocation (Auftriebsverteilung) of the wing. That show not only studies, it is drawn also on long known aerodynamic theory. Nevertheless a elliptic lift-allocation arise from something similar than an elliptic planform.


 * I fly in Kammermark at the "old gentlemen" of the Akaflieg Berlin (AFV Berlin), our planes are Grob G-103 Twin II, Rolladen-Schneider LS4, Schempp-Hirth Discus, Schempp-Hirth Nimbus-2, Scheibe SF-25 C.


 * Thank you for your help in the Akaflieg-article! "Tragflächen-V-Winkel" not wing-v-angle?
 * PS: i am also the author of the German Wiki-article about the history and objects of the Akafliegs generally. Could you also help there, my English is quite limited . -- Alex M. Volz (talk) 21:59, 22 November 2007 (UTC)

Alex, we have two words: wing and angle. There is no English word: wing-v-angle. Do you mean angle of attack, Angle of incidence, dihedral, wing sweep angle or something else? My German is worse than your English, so I could not help with the Akaflieg article in German Wikipedia. However if you want to update an article about gliding in English Wikipedia, I will look an any changes that you may wish to make. If you look in the article about the Minimoa, you will see that the term used is "gull-wing", like a sea-bird's wing. I have modified the wording of the article about the Discus. It now reads: "Studies by Sigismund Hörner in 1951 had shown that a wing with a generally elliptical planform should have a slightly up-turned tip with the leading edge curving back to keep the trailing edge straight. Wil Schuemann demonstrated this in 1978 when he modified his ASW12 to show that swept back wingtips produced a marked improvement. To keep production costs down, a triple-trapezoidal approximation of the ideal elliptical shape was adopted for the Discus." I am almost directly quoting from "Sailplanes 1965-2000" by Martin Simons, but I have made sufficient changes to avoid infringing his copyright. JMcC (talk) 09:33, 23 November 2007 (UTC)


 * Jmcc150, thank you very much for your comments. I think, the English word "gull-wing" could be correct; Tragflächen-V-Winkel should be wing-dihedral-angle.


 * About the Discus we wrote about different things (elliptical lift-allocation and back swept wingtips), no problem.

Jmcc150, i published a English version of my German article about history and aims of the Akafliegs generally. Could you please correct my English in this article? -- Alex M. Volz (talk) 08:26, 24 November 2007 (UTC)


 * JMcC150, thank you very much for the correction of the article. -- Alex M. Volz (talk) 10:57, 24 November 2007 (UTC)

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