Talk:Ludwig Prandtl

Untitled

"After Hitler came to power in 1933 Prandtl acquiesced in the dismissal of his Jewish colleagues"

If you want to diffamate people, you should at least give some more details from different sources.

"... and went on to engage in numerous propaganda exercises aimed at maintaining Germany's standing in the international scientific community."

It is possible that he engaged in public for his country to bypass the informal international boykott - not of the Soviet Union or Poland, but of Germany! During the 1930s efforts of some countries resulted in rising exclusion of German contributions from international recognition. As those countries and specific persons want to have everything that happened within Germany between 1933-45 to be just propaganda and so on, your claim of "propaganda exercises" is just worthless.

So write down your very own propaganda or those of some book writers somewhere else.

... oh, you forgot to mention that Prandtl propably built the world's first wind tunnel. At least, his wind tunnel were built before the Wright Brothers were building theirs! Was this not mentioned in your fancy book?

Wind tunnels

There is a claim in the article that Prandtl may have built the first wind tunnel. "A History of Aerodynamics" by John D Anderson Jr (CUP) states that the first such, 18 in square and 10 feet long was built by Francis Wenham with a group of three other engineers. The starting point was a paper by Wenham to the Aeronautical Society of Great Britain (ASGB) in 1866, which led to the formation of a sub committee in 1870; it chose the engineers and provided funding. Exactly when the first data were taken is not given by Anderson, but sometime 1870-2 fits his account. By 1872 the tunnel had been displayed publicly in London. There is probably more detail in the Annual Reports of the ASGB (especially 1872), but the whole process seems well recorded and beyond dispute. It was crude, of course but gave useful info on e.g. lift to drag ratios and forces on inclined plates. I suggest we remove the claim.TSRL (talk) 19:53, 19 August 2009 (UTC)

Header

Having looked at the header again I'd be inclined to revert to that of 2 June 2009. A lot of words were added by the next editor, without a great increase of content, though it is true Prandtl had things to say on compressibility. Reading Anderson, his strengths seem to have been those of the physicist (identifying the important parts of a problem) rather than the ability to get formal solutions to complete equations. There is a lot of confusion, it seems to me in the current header over his role as mathematician, physicist or engineer. The header should be more focussed and a reversion, with a nod to compressibility would, I think be better.TSRL (talk) 22:40, 19 August 2009 (UTC)

Life and Research with the Allied and USA After WWII

I am sure I read somewhere that Prandtl had cooperate for some research and teaching to US Allied and he allowed them to access his research and work. I believe this should be mentioned in this new paragraph of the Article. — Preceding unsigned comment added by 168.187.205.102 (talk) 10:09, 16 July 2011 (UTC)

Reunification of hydraulics and hydrodynamics

Shouldn't there be mentioned that through identifying boundary layers, Prandtl resolved the schism which existed between hydrodynamicians and engineers ? — Preceding unsigned comment added by 193.157.205.97 (talk) 08:15, 13 June 2013 (UTC)

Assessment comment

The comment(s) below were originally left at Talk:Ludwig Prandtl/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

Working towards a FA The article has good amount of information What is needed is :- More references Copyedit

Last edited at 18:49, 11 February 2007 (UTC). Substituted at 22:35, 29 April 2016 (UTC)

"Later years" contains some assumptions and possible errors

"Prandtl later extended his theory to describe a bell-like lift distribution," My understanding is that he re-evaluated his theory which had resulted in elliptical lift distribution and instead of constraining wing span, as was originally assumed to be the main component of drag for the aircraft much like a car, constrained total lift, which is far more appropriate for an aircraft. He did this by minimizing bending moment of the wing, reasoning that larger bending moment required more structure to support.

" obtained by washing out the wing tips until negative lift was obtained," While the resulting lift equations can be used to determine optimal downwash for an aircraft, Prandtl himself did not understand how to practically achieve this goal. His 1933 paper concluded that the solution is sharp tipped wings, suggesting that he never thought of washout, and instead was thinking of adjusting lift solely with planform. It is impossible to achieve the proper lift distribution with planform alone. To achieve the desired lift distribution, downwash transitions to upwash, but the lift is never negative. Instead the transition has the effect of slightly rotating the lift vector forward towards the tips.

"which gave the minimum induced drag for any given aircraft weight," This part is suggested in his 1933 paper

"also suggesting that adverse yaw forces could be countered solely by wing tip aerodynamics," This part is not suggested anywhere in his paper. My understanding is that Al Bowers put together 1.) achieving downwash and lift distribution described by Prandtl through a combination of planform and non linear wing twist, 2.) that the rotation of the lift vector forward near the tips could be used to achieve proverse yaw, 3.) that such proverse yaw may eliminate the need for a vertical tail

"but this new theory was largely ignored." true

"In the 21st century the American engineer Al Bowers has confirmed the idea, calling his experimental wing the PRANDTL-D." I believe the program itself is called PRANDTL-D, and that there have been 4 aircraft constructed, 1, 2, 3, and 3c, so each wing would have a name such as PRANDTL-D 3c JKBodylski (talk) 10:54, 15 September 2018 (UTC)

Prandtl's Work after University

I will be adding information to the third paragraph of Early Years about where Prandtl worked after university and a more specific description of what he did there. Srlg36 (talk) 17:27, 3 March 2023 (UTC) Srlg36 (talk) 17:21, 3 March 2023 (UTC)

I am adding information to the Prandtl and the Third Reich section regarding his involvement with the German Physical Society (DPG). Camstr32 (talk) 17:30, 3 March 2023 (UTC)

Wiki Education assignment: History of Science

This article was the subject of a Wiki Education Foundation-supported course assignment, between 17 January 2023 and 5 May 2023. Further details are available on the course page. Student editor(s): Srlg36, Camstr32 (article contribs). Peer reviewers: TechnoChemist, Gwa19.

— Assignment last updated by K8shep (talk) 18:02, 12 March 2023 (UTC)

I'll be adding information on Prandtl's work on circulation and the boundary layer. Camstr32 (talk) 18:27, 7 April 2023 (UTC)

New material in Later Years

I am removing the "In 1922, Prandtl together with Richard von Mises..." in the Later Years section and adding information about the GAMM and ZAMM. Srlg36 (talk) 16:01, 14 April 2023 (UTC)

I will also be adding information about the professional rivalry between von Kármán and Prandtl in the later years section. I am altering the paragraph that begins with "After discovering the boundary layer..." Srlg36 (talk) 16:34, 14 April 2023 (UTC)

I continued with adding further information on Prandtl's work at Göttingen, starting at: "The effect of the paper was so great that Prandtl would succeed..." Srlg36 (talk) 02:40, 28 April 2023 (UTC)

I will be adding information regarding some boundary layer discoveries of Prandtl's students while he was at Gottingen. Camstr32 (talk) 00:03, 1 May 2023 (UTC)