* A better rate of climb
* Faster cruise speeds
* Improved single engine
performance
* Increased in flight stability
* Shorter landing rolls
The basic purpose of winglets is to reduce lift-induced drag by breaking up wingtip vortices. But that primary function sets off a chain reaction of other favorable characteristics including those listed above. The winglets reduce yaw --- especially yaw in turbulence. During stalls, they prevent the wingtip from stalling first, thus reducing the tendency of one wing dropping before the other.
