What's a flying buttress?
467814
It's a structural version of the piece of metal put underneath shelves on walls for support.  It connects the main building to an extra room that juts out by supporting it form the underneath.
1077367
An aircraft flies due to aerodynamic reactions that happen when there is relative motion between air and a wing.\n\nIf a cross-section of a typical aircraft wing is viewed, the top of the wing can be seen to be curved downwards, while the bottom of the wing is less curved or straight, but angled to the airflow. This shape, called an airfoil or aerofoil, creates lift when it travels through the air. However, this optimisation is not applicable for aerobatic aircraft, which need to fly inverted, or for supersonic aircraft.\n\nLift is created as an airstream passes by something which deflects it. The force created by this deflection of the air creates an equal and opposite force on the wing according to Newton's third law of motion. The deflection of airflow downward during the creation of lift is known as downwash.\n\nNearly any shape will produce lift if curved or tilted with respect to the air flow direction. However, most shapes will be very inefficient and create too much drag. One of the primary goals of wing design is to devise a shape that produces the most lift while producing the least lift-induced drag.
1158529
The "black box" is actually bright orange, so it can be found easily.  It's made of quarter inch thick stainless steel, while the skin of a plane is made of aluminum about 28/1000 of an inch thick.  If the plane were built of materials even 1/10 the strength of the black box, it could never get off the ground.\n\nEven if you could make a plane out of concrete and steel I-beams, and somehow get it to fly, if it hits the ground at 100mph, it's going to get crunched, no matter how strong it is.  That energy has to go *somewhere*, and a good portion of it will go into the plane's structure.
439960
According to the Bernelli principle it is because the ratio of high-speed wing over the TOP of the foil of the wing is not sufficient to generate lift.  Therefore gravity takes over and it falls back to earth.
506884
This design cant pull enough air down fast enough to achieve lift. The key to flight is the airfoil shape of the wing or helo propeller. Its naturally causes high pressure under the airfoil as air moves rapidly over it. Thats where lift is achieved.
580970
That's always been my question...how much of it is flying, and how much of it is just coasting from the previous flap? :P
690572
against the direction of travel.
1057293
The Flying Freeloader!
378440
carnival baloons reach a specific hieght at which they stop verical movement and start to float around losing gas and eventually coming down to earth. i dont know why hey stop movung up but my guess is that they stop when the thickness of air at that altitude is less than the density of helium.
772547
Increase your elevation or find a court with less gravitational force.   It's  a physics thing.
680049
Great question, and you have the answer within the question!   It's air pressure that allows an airplane to rise into the air.  The secret is to get more pressure pushing up than pushing down.\n\nMany years ago scientists discovered that fast moving air exerts less pressure than slower air.  So you have to get the air on top of the plane's wing moving faster than the air on the bottom of the wing.  How do you do that?  Curve the top of the wing!   Then the air has to travel farther (to go over the curve), so it's going to go faster.  The bottom of the wing is flat - slower air, more pressure up against the wing.  \n\nThe difference between the two pressures - under and over the wing - is enough to make even a huge 747 go up into the air - if the air is flowing fast enough.  That's why an airliner has go almost 200 km/hr (or well over 100 mph) to before it starts to fly.
1183225
The instant an object is released as it is thrown upwards, it begins to accelerate downward.  This downward acceleration is caused by gravity (the force of weight, m*g, acting downward on the object).  Although the object may continue to travel upwards for a brief time, it is continually slowing in the upward direction as it accelerates towards the ground.\n\nObjects "fall" towards the ground (in the direction of the center of the Earth's mass) since that is the direction of the force of gravity is exerted on them.  An object cannot "fall" up since there is no net force acting in that direction.
1005852
Spinning flights were really designed to prevent flight deflection on tightly grouped darts. Instead of bouncing off the other dart the flight will rotate to allow another dart next to it.
1123435
Hi, its not gravity but a force opposite to gravity that prevents a boat from sinking and keeps an airplane in the air. Sorry, but I forgot the name of the force, I think it begins with a B. O, the second person said it- Buoyancy.
902957
Aerial.  Its from space.
38489
On an airplanes wing, the top is curved in shape, and the bottom is straight.  When the plane gains speed, the air will be forced to move faster over the curved portion.  The faster moving air applies less pressure than over the straight portion therefore creating "lift"
460474
HI MAWBY --\n\nI ANSWERED THIS YESTERDAY IN SOME DETAIL.\n\nPLEASE GO TO THE SITE AND QUESTION BELOW.\n\nITS IN THE AILERONS, TABS, AND ELEVATORS.