Name of a plane with no engine?

Here's why:

* Gliders rely on gravity and air currents to stay aloft and move through the air.

* They have no engine to provide thrust, so they must be launched from a tow plane or a hilltop to gain initial altitude.

* Once in the air, gliders use thermals (rising columns of warm air) to gain altitude and stay airborne.

Let me know if you have any other questions!