Answer / 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.

Answer / kalaivanan

this is due to because the wing tip portion lies at contact
with the atmosphere air n so the pressure created at the
tip is not uniform and thus resulting stall in that
portion,for preventing that winglets can be installed at
that portion.

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