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<blockquote data-quote="Frozen_Heart" data-source="post: 8753096" data-attributes="member: 7029687"><p>The same way a modern bird or bat can launch into the air from a standing start. A bird will jump, and then use a downstroke of its wings for the initial momentum. It's extremely energy intensive and requires huge flight muscles, combined with a build which has shed every bit of weight possible. The animal is essentially having to hold itself aloft via pure muscle power until it gains enough speed to generate lift.</p><p></p><p>Pterosaurs are the same. Despite appearing to stand the size of a 1,000kg - 2,000kg giraffe, a quetzalcoatlus only weighed ~250kg at the highest. Its entire body was extremely lightweight and filled with air sacks.</p><p></p><p>Not only that, but quad launch provides a huge advantage over a bird. A bird has to make a constant tradeoff. As it uses its legs for the initial jump, they need to be strong enough to launch it into the air. However as they get stronger, they get harder to carry for the wings, becoming dead weight in flight. If the wings get stronger, the animal becomes heavier and more difficult to push into the air via its hind legs.</p><p></p><p>Quad launch uses the same limbs for launch and flight. As you make the launching limbs stronger, the flying limbs become stronger.</p></blockquote><p></p>
[QUOTE="Frozen_Heart, post: 8753096, member: 7029687"] The same way a modern bird or bat can launch into the air from a standing start. A bird will jump, and then use a downstroke of its wings for the initial momentum. It's extremely energy intensive and requires huge flight muscles, combined with a build which has shed every bit of weight possible. The animal is essentially having to hold itself aloft via pure muscle power until it gains enough speed to generate lift. Pterosaurs are the same. Despite appearing to stand the size of a 1,000kg - 2,000kg giraffe, a quetzalcoatlus only weighed ~250kg at the highest. Its entire body was extremely lightweight and filled with air sacks. Not only that, but quad launch provides a huge advantage over a bird. A bird has to make a constant tradeoff. As it uses its legs for the initial jump, they need to be strong enough to launch it into the air. However as they get stronger, they get harder to carry for the wings, becoming dead weight in flight. If the wings get stronger, the animal becomes heavier and more difficult to push into the air via its hind legs. Quad launch uses the same limbs for launch and flight. As you make the launching limbs stronger, the flying limbs become stronger. [/QUOTE]
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