Sailplane

## Description

_Sailplane_ tasks the player with landing a sailplane. The player only has
control over the spoilers of the plane. Starting at a specific height and
distance to the runway. The plane requires a certain length of runway to come
to a stop so the player must land in time to not crash. The player gives a
glide ratio (between 8.5 and 23) for the spoiler and a duration for which to
use this ratio. After which an updated position is given and the settings can
be adjusted.