A diagram of the use of slats and flaps to increase lift on an airfloil on a slow flying aircraft. The extra lift is caused by the Coanda effect as the air is diverted through the openings caused by the extended slats and flaps. This is not an engineering drawing, but a somewhat exaggerated diagram to emphasize the major points.
<a href="//commons.wikimedia.org/wiki/User:Cruithne9" title="User:Cruithne9">Cruithne9</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>