Assertion: glider's lift | /r/HasProperty | equal
Facets:
value: essentially
type: DEGREE
value: to weight
type: OTHER
value: for sustained straight and level flight
type: OTHER
Source sentences:
text: For sustained straight and level flight, lift must be equal and opposite to weight.
text: Both increase lift for a given speed and usually also increase drag, but since lift has to be equal to weight, the practical effect is to allow flight at a lower speed.
text: When the glider wings are level, lift and weight are essentially equal and generally constant.