Change: Moved by 1tiger9 Apr 11 2008, 10:53 PM EDT

Change: Lift is the force that keeps the plane flying. Lift is one of the four forces that keeps a plane flying. But each of the four forces has   View changes from previous version. (Word count: 779)

Change: The bottom of the wing is flat, so air flows smoothly under it. But the top of the wing is curved, so that's more surface area for the same amount of air to go over. Since There theare samemany amountexplanations of air has to go over it,   View changes from previous version. (Word count: 774)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 996)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 996)

Change: beleive several thories,different reasons, so you may or may not agree with this. Since it can be hard to learn something without a picture or diagram, I put the picture below. You may have looked at this diagram, but you   View changes from previous version. (Word count: 894)

Change: its buoyancy in the air much like a submarine does in the water. The ballonets act like ballast tanks holding "heavy" air. When the blimp takes   View changes from previous version. (Word count: 883)

Change: Click on the button to see how a blimp ascends and descends. A blimp or airship controls its buoyancyitsbuoyancy in the air much like a submarine does in the water. The ballonets act like ballast tanks holding   View changes from previous version. (Word count: 876)

Change: over. And if drag takes over, there isn't enough lift to compete with the weight. That's the main things that make an airplane fly!!! How Helicopters Fly   View changes from previous version. (Word count: 454)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 451)