727 inboard leading edge devices

Date:         29 Nov 97 15:40:04 
From:         Andrew Goldfinger <Andy.Goldfinger@jhuapl.edu>
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     The inboard leading edge devices on the 727 do not deploy by sliding
forward as do the devices on most other aircraft.  Instead, they rotate
downward and outward pivoting near the leading edge.  Intuitively, this
bothers me.  With a "sliding" device, the change in wing shape during
deployment seems more continuous to me.  Do the 727 devices do strange
things to the aerodynamics when partially deployed?  Why were the devices
made in this way?  Is there a name for this type of device?