<P> Glider pilots can stay airborne for hours by flying through air that is ascending as fast or faster than the glider itself is descending , thus gaining potential energy . The most commonly used sources of rising air are </P>
<P> Glider pilots can stay airborne for hours by flying through air that is ascending as fast or faster than the glider itself is descending , thus gaining potential energy . The most commonly used sources of rising air are </P>
how long do gliders stay in the air
how long do gliders stay in the air
can stay airborne for hours
can stay airborne for hours