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downwards    音标拼音: [d'ɑʊnwɚdz]
ad. 向下

向下

downwards
adv 1: spatially or metaphorically from a higher to a lower
level or position; "don't fall down"; "rode the lift up
and skied down"; "prices plunged downward" [synonym: {down},
{downwards}, {downward}, {downwardly}] [ant: {up},
{upward}, {upwardly}, {upwards}]


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  • How can a plane spiral downwards uncontrolled instead of gliding . . .
    There have been cases (example) where a plane seems to spiral downwards Shouldn't it glide? I always thought you'd have a reasonable chance of landing a plane even without engines if you find some
  • How do you stay stable when landing taking off an F-35 during a VTOL . . .
    The F-35-B STOVL variant of the Lockheed-Martin F-35 Lightning II gets its V STOL STOVL capabilities from the Rolls-Royce LiftSystem, which consists of four main components: The Three Bearing Swivel Module (3BSM), which allows to turn the nozzle downwards 90° in order to act as a vertical lift system The two roll posts on the wings, which divert bypass air from the turbofan engine in order
  • Are wings any more efficient at creating lift, versus orienting the . . .
    Specifically, it converts the horizontal thrust of the engine to vertical lift It does so efficiently, but not with more than 100% efficiency It cannot compensate for the engine being an inefficient high-speed accelerator of small air masses (right?) So why would it be less efficient to point the thrust downwards directly (like in a helicopter)?
  • Why are almost all winglets turned upwards? - Aviation Stack Exchange
    These are no winglets! Better use the absurdities which Boeing puts on its latest 737 models as an example - one part of them points a bit downwards
  • aerodynamics - Why do airfoils trailing edges point downward . . .
    The same is true for control surfaces: Depending on the desired lift change, their trailing edge will point up- or downwards See below for an example where I plotted the pressure distribution for three flap deflections in one graph Upper and lower surface pressure are shown by color-coded lines, and lower lines belong to the lower surface
  • Why are downward pointing winglets more efficient?
    For efficiency the orientation of winglets is not important Best would be to stretch them out horizontally, but on a canard they do double duty as vertical tails Things look different when maneuvering is added: Now the downward-pointing winglet is superior especially if it carries a rudder When roll is commanded by deflecting the ailerons, the lift change on the outer wing will carry over
  • When an aircraft is descending, does any lift act on it? If yes, how?
    When descending , an aircraft never goes in free fall, even if negative angle of attack is large Does that mean the net downward force is not gravity, but less than gravity, due to certain lift ac
  • Why do tip vortices seem to bend inwards at the tip of a plane wing?
    Here if you look closely, the tip vortices seem to bend or travel inwards very slightly after the aircraft has passed In this picture, the effect is more exaggerated on the lower wing What force makes the vortices bend inward? My original thought was that the wake of the plane itself is the culprit, but I'm not sure, as the vortices seem to only bend right as they leave the wing, and then
  • landing - Why does it feel like a plane accelerates just before . . .
    On commercial flights it often feels like the plane gets faster just before touching down What creates that sensation?
  • If a circling airplane (AC-130) fires a bullet how does the planes . . .
    When a projectile is fired from a gun in a fixed wing aircraft or helicopter in a direction perpendicular to the direction of flight, the airflow across the muzzle has an effect on the trajectory which is known as "bullet jump", the deflection can be upwards or downwards depending on the direction of the rifling of the gun (normally right hand





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