A bird has a mass of 1.4 kg. It flaps it's wings to control it's forward thrust. What is the forward thrust if the bird is stationery in the air?
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Birds can fly in various ways. The albatross demonstrates soaring, while the godwit is on the downbeat, flapping. A bird's wing produces lift and thrust during the downstroke. The air is deflected downwards and also to the rear.
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Hummingbirds, on the other hand, are able to remain in the same place in still air as long as they wish -- they are true hoverers. A hovering hummer keeps its body at about a 45 degree angle to the ground and moves its wings in more or less a figure-eight pattern, with the "eight" lying on its side.
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