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Gravity turn of the Space Shuttle. A gravity turn or zero-lift turn is a maneuver used in launching a spacecraft into, or descending from, an orbit around a celestial body such as a planet or a moon. It is a trajectory optimization that uses gravity to steer the vehicle onto its desired trajectory.
Walk-in bathtubs have either an inward-opening or cap-like fitted door, descending to near ground level to allow a person to enter the tub without climbing over its side; the door is self-sealing. [1] Most walk-in bathtubs also have a chair-height seat, but some, which are the same basic configuration as a standard bathtub, do not have any seat.
The drag at zero-lift can be more easily conceptualized as the drag area which is simply the product of zero-lift drag coefficient and aircraft's wing area (, where is the wing area). Parasitic drag experienced by an aircraft with a given drag area is approximately equal to the drag of a flat square disk with the same area which is held ...
Its unusual appearance earned it the nickname "flying bathtub" and was designated the M2-F1, the M referring to "manned", and F referring to "flight" version. In 1962, NASA Dryden management approved a program to build a lightweight, unpowered lifting-body prototype. It featured a plywood shell placed over a tubular steel frame crafted at Dryden.
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Fly the aircraft so that the fuselage is perpendicular to the ground (along the wings' zero lift axis). The attitude of the aircraft is judged, not the flightpath, therefore the aircraft may drift downwind during a vertical maneuver. 45° up line Fly the vertical attitude plus or minus 45°.