You Do Need power plug adapter while traveling from Tahiti to Chad.

Here is Why You Need An Adapter

The outlet and plug type used in Chad are C, D, E and F and in Tahiti are C and E. This is how they look like.

Tahiti

In Tahiti, outlets of type C and E are in use.

Type C

Type E

Chad

In Chad, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F