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The text and very narrow lines used in the drawings for "Krueger flap operation" and "Slat operation" are too narrow to display properly, the drawings look faint and washed out. —Preceding unsigned comment added by Dougher (talk • contribs) 05:12, 28 August 2010
The Boeing 720 was equipped with Krueger flaps, and I'm pretty sure that pre-dates the 747 that the text claims here. Maury Markowitz (talk) 19:27, 23 April 2011 (UTC)
The article isn't claiming that the Krueger flaps on the 747 were the first, or pre-dated those on the 720 or 727. The article is citing page 114 from John W.R. Taylor's book Lore of Flight. It may be that Taylor's book talks only about Krueger flaps on the 747 and omits any reference to such flaps on earlier aircraft types. I don't have immediate access to a copy of Taylor's Lore of Flight so I can't comment further.
If the article is to have a statement about Krueger flaps on the 720 it needs to cite a reliable published source for that statement. Dolphin(t) 03:28, 25 April 2011 (UTC)
I believe I added that entry and it is being misread, it's just saying that the Kruger flaps of the 747 are made from fibreglass and are forced into a curve in operation, checking the reference shows a wing cross section of the B737, also equipped with them. It would be nice though to find out who Kruger is or was and when they were first used, I would think that would have been some aerodynamic prototype test bed aircraft. They're not confined to airliner types either, the Tornado GR1 has them but they are locked closed as a maintenance nuisance. Nimbus(Cumulus nimbus floats by) 07:49, 25 April 2011 (UTC)