Talk:Gurney flap

Where does the term "wickerbill" come from?
Gurney flap is obvious but whence wickerbill? MyIP19216811 (talk) 13:53, 24 December 2023 (UTC)

Gurney Flap article
Hi, I am the author of one of the references in this article, reference 21, by myself, Dan Neuhart. Regarding the first figure in the article, I need to have the reference for that figure changed to the reference from which I extracted that figure. Instead of the NASA reference (my reference), it should be, "Design of Subsonic Airfoils for High Lift", by Robert H. Liebeck, Journal of Aircraft, vol. 15, no. 9, September 1978, pp. 547-561. Thank you. Respectfully, Dan Neuhart Neuhart3 (talk) 20:20, 28 January 2024 (UTC)


 * Thanks for drawing this to our attention. I have changed the reference as you requested. It is now reference #1.
 * On a second matter, the URL for your reference (previously #21) appears to be unserviceable so readers can no longer access your Memorandum online. Are you able to refresh the URL so we can again see TM-4071? Thanks. Dolphin ( t ) 23:27, 28 January 2024 (UTC)
 * Sorry for the months-late response. I just saw this. A link to the report is https://ntrs.nasa.gov/api/citations/19890004024/downloads/19890004024.pdf. Of course the reference is now reference 22 in this article. Thanks 198.120.11.134 (talk) 17:47, 11 June 2024 (UTC)

S-76B Horizontal Tail
The description of the S-76B horizontal tail is incorrect. The S-76A horizontal tail has an inverted NACA 2412 airfoil. For the S-76B, a symmetrical airfoil was created by using inverted lower surface skins for the upper surface. This didn't give quite enough lift in each direction, so Gurney flaps were added to both sides of the trailing edge. How do I know this? I did the aero design work on the tail. 47.6.176.26 (talk) 04:56, 10 April 2024 (UTC)


 * Thanks for that information. What do you think about the following alternative wording?
 * "The Gurney flap was first applied to the Sikorsky S-76B variant(ref name=Houghton/) when flight testing revealed the horizontal stabilizer with a symmetric section was not providing sufficient lift in both directions. Engineers fitted a Gurney flap to the stabilizer to resolve the problem without redesigning the stabilizer from scratch.(ref name=Houghton/)"
 * Do you agree that Houghton is a satisfactory source for this information? It would be unusual for confidential manufacturer information like this to be quoted in a student textbook. Can you suggest a better source to quote for this information about the B-model? On Wikipedia, all information published is expected to be able to be independently verified by referring to a reliable published source. Please see WP:VERIFY. Dolphin ( t ) 12:58, 10 April 2024 (UTC)