I am asking more in terms of. The Pro's and con's of using these devices..for example.
Why the manufacturer of one large Jet choses to use uses kruger flaps on the LE, and triple slotted flaps on the TE
While another manufaturer uses slats on the LE and Single slotted flaps on the TE ?
Surely there must be pros and cons of using different types of LE and TE devices ? any ideas?