Answer Posted / shashank h r

Usually,stalls occur at high AOA or at low speeds.This is
because the airflow over the wing just stops creating a
very low lift.
In the case of a swept wing,as we move towards the tip,the
surface area of the wing can be considered to be decreasing.
Therefore, lower surface area means lower lift and thats
why stalls start at wingtips.
For your information, winglets prevent wingtip
vortices.They just stop the pressure leak between the upper
and lower surfaces of the wing thereby increaing the
efficiency. It has a low effect on stalls.

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