airbus_adarsh,
You'll find just about every recent jetliner has those "canoes", simply because the wings themselves (towards the trailing edge) are too thin to house the entire 'track AND hinge AND actuator' arrangement that's needed to move the flaps (where each flap can consist of up to three separate elements) up to 40 degrees down.
forget,
I don't think your link was all that helpful for him... what our friend needs is a basic drawing of triple-slotted flaps with tracks, hinges, actuators and all.
barit1,
Kücheman comes to mind. Funny how Convair got it wrong both on the 990 and the 102.
CJ