King767 From , joined Dec 1969, posts, RR: Posted (12 years 7 months 2 weeks 5 days 3 hours ago) and read 2947 times:
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?
Prebennorholm From Denmark, joined Mar 2000, 6123 posts, RR: 55 Reply 2, posted (12 years 7 months 2 weeks 4 days 20 hours ago) and read 2855 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
King767 From , joined Dec 1969, posts, RR: Reply 3, posted (12 years 7 months 2 weeks 4 days 20 hours ago) and read 2842 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?
King767 From , joined Dec 1969, posts, RR: Reply 12, posted (12 years 7 months 2 weeks 3 days 18 hours ago) and read 2753 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).
King767 From , joined Dec 1969, posts, RR: Reply 13, posted (12 years 7 months 2 weeks 3 days 18 hours ago) and read 2750 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.