Question:
Why do larger birds flap slower than smaller
birds? Why don't manned airplane use
flapping to generate lift and thrust?
Answers:
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The flapping motion is a function of wing size. The larger the bird, the slower the flap and vice-versa. Look at the hummingbird - small thin wings flapping faster than you can see. The flight of birds has been studied by men and scientists for centuries. Early attempts at manned flights tried to mimic the bird's motions. Most all were miserable failures. A bird has a hollow bone structure making their power to weight ratio so much higher than anything man can build. Flapping wings to fly also carries a limitation of maximum speed - flight past the sound barrier would be impossible this way let alone any speed close to that. God created birds to fly, but not man, so, we have to use alternate methods to get us through the air and beyond.Is it true that English Electric P1 supersonic fighter could increase its speed in a vertical climb?
Large birds have bigger surface area of wings, therefore creating greater thrust through the air. A comparison is swimming with large and small flippers.Some do. A helicopter's rotors do the same job as birds' wings.
not generally true ( swifts/swallows quite often glide) but it's more to do with 'lifestyle :- if the bird is one that searches from the air ( buzzard/Heron/Crow) then they are often wheeling and gliding;If the bird is basically a ground/hedge feeder , then they operate a short distance from their nests and tend to use flight for escape.This is a tricky question.
There have been attempts at flapping wing machines ( all failures). The trick is to mimic a bird's wing ( it moves in a figure-of-8,it has muscle-controlled feathers ( analogous to our fingers) , it has VERY high power-to-weight ratio ( a lot of birds have hollow bones).More success has been achieved with building insect-like robot machines ( sortof like dragonflies)
Good question.
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.................. bigger the wing lesser the flapping ........ but takes more effort ................. and engines are doing the flapping motion .......... its providing forward motion ......... which converts to height and speed ............What is the highest altitude most helicopters can go?
A flapping winged aircraft is referred to as an ornithopter. Several attempts have been made to build such a plane but in general it's difficult to do and inefficient. A short, successful manned flight happened in Toronto in July. Check out their site:http://www.ornithopter.ca
http://www.ornithopter.org/
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