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Kreuger Leading Edge Flaps  
User currently offlineKing767 From , joined Dec 1969, posts, RR:
Posted (13 years 7 months 4 days 20 hours ago) and read 3263 times:

Hey guys,
Well, this time I just want to know a bit more about Kreuger flaps. How were these different from the norm? It seems they were not too successfull, seeing they are not used anymore on modern jetliners. What were it's pros and cons, and how were they different from normal leading edge flaps? Also, I see that the A300B4 was produced with Kreuger flaps, but the earlier A300B2 did not have them. What kind of flaps did the B2 have?
Thanks,
Tom

17 replies: All unread, jump to last
 
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3702 posts, RR: 34
Reply 1, posted (13 years 7 months 4 days 19 hours ago) and read 3195 times:
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Not too successful ??? The 747 has them inbd of the inbd engines.

User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6511 posts, RR: 54
Reply 2, posted (13 years 7 months 4 days 14 hours ago) and read 3171 times:

The Krueger flaps are simpler, cheaper and less efficient. They basically only extend the cord a little and increase the camber of the wing profile. Their main advantage is that the mechanics behind them take up less space - and that way leaves more room for fuel etc.

The great advantage of the slottes leading edge flaps or slats is found in the slot. By shaping the slot carefully the air passing upward through the slot is accellerated to a speed somewhat higher than the actual airspeed of the plane. The increased airspeed on the uppper surface of the wing increases lift considerably, and therefore slows down take-off and landing speed more than Krueger flaps do.

Best regards, Preben Norholm



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 7 months 4 days 14 hours ago) and read 3158 times:

Hey thanks Preben.
I must have been mistaken, I thought that only the Classic 74s had the Kreuger leading edge. Just a quick question, I know the A300B4, 747, 707?, and 727 have the Kreugers, but what aircraft do not? Do 767s etc. have them?
Thanks,
Tom


User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 4, posted (13 years 7 months 4 days 13 hours ago) and read 3156 times:

More specifically the slot associated with slats energizes the boundary layer on the upper surface of the wing by accelerating the airflow.

The A300B4 has no krueger flaps.....only slats.

JET


User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6511 posts, RR: 54
Reply 5, posted (13 years 7 months 4 days 11 hours ago) and read 3141 times:

JETPILOT, you are absolutely correct - slats energizes the boundary layer on the upper surface of the wing by accelerating the airflow.

My much longer explanation of the same thing was probably too much "for kids".

Happy landing, Preben Norholm



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 6, posted (13 years 7 months 4 days 9 hours ago) and read 3126 times:

"My much longer explanation of the same thing was probably too much "for kids"."

Oh, thanks Preben. Im sure I would be able to understand your explaination given a few read throughs  Wink/being sarcastic.

Can anyone tell me the aircraft which incorporate the Kreuger flaps, or did I list them all above?

-Tom



User currently offlineIahcsr From United States of America, joined Jun 1999, 3461 posts, RR: 42
Reply 7, posted (13 years 7 months 4 days 5 hours ago) and read 3106 times:
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I may be mistaken, but I believe the 737 has kreugers inboard of the engines.


Working very hard to Fly Right....
User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 8, posted (13 years 7 months 4 days 4 hours ago) and read 3104 times:

A300-600R, also. Inboard, at the wing root. Only two feet long, though..


"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 9, posted (13 years 7 months 4 days 3 hours ago) and read 3104 times:

I dont think you can classify that as a Krueger flap on the A300....More like a pop out fairing.

JET


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 10, posted (13 years 7 months 3 days 18 hours ago) and read 3088 times:

iahcsr: The 737 absolutely has Krueger flaps...inboard of the engine(s), and with a mechanically linked retractable fairing on the lower edge.

User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 11, posted (13 years 7 months 3 days 11 hours ago) and read 3066 times:

The A300s leading edge is classified as a Kreuger flap. I think the 767 has the Kreuger flap?
-Tom


User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 12, posted (13 years 7 months 3 days 11 hours ago) and read 3069 times:

Also, just want to know a way to identify Kreugers when they are less obvious for example on an A300. Looking at A300B2 and A300B4 pics, it is very hard to tell the Kreugers on the B4 from the B2. (The B2 does not have Kreuger flaps).

Thanks, Tom


User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 13, posted (13 years 7 months 3 days 11 hours ago) and read 3066 times:

Also, just want to know a way how to identify Kreugers when they are less obvious. For example, on the A300, when looking at A300B2 and A300B4 pics, I cannot tell the difference between the Kreugers on the B4 and the standard slots on the B2. I mean, the Kreuger flap is one piece, and so are standard slots, so how could I tell? Anyway, they are obvious on the 727 and 707.

-Tom


User currently offlineJt8djet From United States of America, joined Jul 2000, 214 posts, RR: 0
Reply 14, posted (13 years 7 months 3 days 11 hours ago) and read 3071 times:

King767,

The 767-300 has a small Kreuger, to fill the gap, between the inbd slat and the eng pylon.

I don't know for sure if it is on the other 67 versions.


User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 15, posted (13 years 7 months 3 days 11 hours ago) and read 3074 times:

To clear up the confusion here on the A300 High lift devices I will read from an A300 AOM.

The A300 B2 and B4 have a slat leading edge system and a 2 ft long Krueger flap and a notch. This comprises the high lift leading edge devices on these model.

I was mistaken when I posted that that 2 ft piece of krueger flap wasnt a flap. It is classied as a krueger flap.

But 98 % of the leading edge high lift devices on the A300 are slats.

The leading edge device is known as a slat...not a slot. The slat when extended craetes a slot. THe krueger flap does not.

Krueger flaps deploy from under the wing while slats are compossed of the leading edge of the wing which is moved foward and down opening up a slot between the wing and the slat.

There is such a high lift device know as a slot which is only found on the DC8. If you want me to go into that then I will.

But


User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 16, posted (13 years 7 months 3 days 10 hours ago) and read 3068 times:

Krueger Flap

http://sobering.terracom.net/eaa99/UPS-727/N904UP_slat_rear_m.jpeg

http://sobering.terracom.net/eaa99/UPS-727/M904UP_slat_frnt_m.jpeg

Slats


Click for large version
Click here for full size photo!

Photo © Tony kao





User currently offlineKing767 From , joined Dec 1969, posts, RR:
Reply 17, posted (13 years 7 months 3 days 9 hours ago) and read 3061 times:

Thanks for clearing that up JETPILOT.
-Tom


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