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Bladed Airplane
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 65" 2-Bladed McCauley Mini MIRROR POLISHED Airplane Aviation PROPELLER Display  US $2,285.00
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When we think of the first aircraft, many of us think of the hot air balloon. But the helicopter actually predated it by thousands of years. As early as 400 BC, people knew that rotary devices could fly.
Perhaps the earliest helicopter-like device was an ancient Chinese children's toy made out of bamboo. It consisted of a propeller attached to a stick in a T-formation. When the stick was rolled quickly between the palms and then released, it flew a short distance.
The ancient Chinese may have gotten the idea for their toy by watching nature. Many trees disperse "helicopter" seeds, which are single seeds with a stiff, membranous wing on one end. The wing has a slight pitch, causing the air to move beneath it in such a way as to make the seed spin as it falls. This causes the seeds to scatter more widely than they would if all the seeds on the tree simply fell straight down.
The Chinese bamboo-copter made its way to Europe via medieval and Renaissance trade routes, and undoubtedly inspired one of the greatest minds in history, Leonardo Da Vinci, to take the design to the next level.
In 1493, Da Vinci diagrammed an "aerial screw" with a single spiral blade attached to a platform. According to his own writing, Da Vinci never intended to design the device for practical flight; instead, he used it as a means to test a propeller's "tractive efficiency." He envisioned the blade to be constructed of linen coated in a layer of starch to make it airtight.
In theory, this early helicopter could be powered by four men standing on the platform and pumping bars in front of them. Da Vinci notes the possibility of building a paper model using a small spring as a power source.
Centuries later, two French inventors, Launoy and Bienvenu, designed a helicopter with two rotors on either end of a single shaft. This device had two contra-rotating blades that moved in opposite directions. This counteracts torque, which causes the body of the helicopter to rotate in the opposite direction as the rotor. With two contra-rotating blades, torque is canceled out. The blades are placed on the same shaft, making them coaxial.
In practice, however, helicopters needed adequate force to turn the propeller before a vessel large enough to carry a person could truly take flight. When the steam engine was developed, inventors at last saw possibility in the old designs of Da Vinci. The first to build a working helicopter with a motor was the French inventor Gustave de Ponton d'Amecourt. He designed a steam-powered flying device made from lightweight aluminum. While it never flew, the model was the first to use an engine.
It was the internal combustion engine, however, which gave the helicopter its real power. In the first decade of the 1900's, a series of inventors designed helicopters with contra-rotating propellers and internal combustion engines.
In 1907, the Gyroplane No. 1, invented by two brothers, Louis and Jacques, Breguet, lifted a person a few feet off the ground for a minute. This was considered the first manned helicopter flight, but it was not unassisted--the craft was extremely unstable, and required assistants on the ground to keep it steady.
In the 1920's, the helicopter as we know it today began to take shape. Inventors developed craft with cyclic pitch, which allows each blade to be angled individually to control the craft's movement forward and backward; a rotor hub that tilted, allowing the craft to move side to side without a separate propeller; and autorotation, which allows the propellers to be turned by the surrounding air if the engine fails, making a safe landing possible.
The helicopters of this time managed flights of up to fourteen minutes, and reached maximum heights of fifty feet. Mass production didn't occur until World War II. During this time, Nazi Germany developed the most high-tech helicopter of its time, used in limited quantities during the war.
In 1942, the U.S. Army began mass-producing a helicopter used for rescue missions. The British Royal Air Force set up a helicopter training school. The first helicopter approved for commercial use was the Bell 206, which was made available to the public in 1946.
Today, helicopters can hover, move forwards and backwards, and perform many other aerial maneuvers impossible to repeat in a plane. Their extreme maneuverability makes them ideal for military missions, dangerous rescue missions in varied and wilderness terrain, use as flying ambulances, and more. There's no question that ideas from thousands of years ago have given us one of our most useful and versatile flying machines.
J.Vince is director of http://www.thanksdarling.com supplier of experience days out and gifts. For a range of flying experiences including helicopter flights visit http://www.thanksdarling.com/helicopter-flying-60-mins.html
How To Build A Homemade Wind Generator Blade
A wind generator blade is the most important component in the working of the wind turbine. These blades are curved and large, and they are quite similar to the propeller blades of an airplane, and they are the source for generating power. Creating your own wind generator blade is an excellent method to bring down the cost of making your own turbine and it also gives some self gratification. This article gives a brief look at how to build the homemade wind generator blades to save money.
It is very important to choose the correct products to make the blades as it is directly connected with the efficiency of the wind generator. Some of the materials that are used to build blades are wood, metal, and plastic. Woods are considered as the good choice for the yesteryear traditional wind generators, metals are very easy to work with, and plastics are the ideal material to make the blades. We recommended to build them with PVC pipes because of a lot of reasons such as the wood can crack, wood absorbs water, and the crack makes wood to absorb water. Also, wooden blades can be difficult to make and that can be very time consuming. Other DIY sites make different choices and those are also good as long as you have a good eye on your own skills.
For making three wind generator blades, you require about 4 or 6 PVC pipe of 4 long and for wind blades that are 30 in length, you can make use of 4 diameter PVC pipes. To make blades between 30 and 48, you may require PVC pipe of diameter of 6. First, the middle line should be drawn down the pipe, as the blades branch from the center line and thus makes more power. The blade should be made pointed for about 5 at the root and 2 at the other end, and then cut the blades on the drawn area.
Smooth the edges near the cut part to get a good finish and before equalizing the blades, paint the blades with the UV protective paint. UV protective paint shields the PVC pipes from getting brittle due to the sunlight exposure. For equalizing the blades, place them on the hub and place the hub on the piece of steel rod with few pillow block support. Spin the blades to mark the bottom blades and trim the bottom one a little more than the others, as balanced blades are safer than the unbalanced ones.
It is important to remember that saving money is not the only criteria when you decide to make or buy your own wind generator. Your skills, the amount of power you want to create and the investment you are willing to make are also things to consider. You can buy DIY plans here because making your own wind generator blade is also a nice job to do. Or look at a ready to go system like the Skystream 3.7. Whatever choice you make you will save money in the end.
About the Author
At her website Unlike Normal Energy, Cathy Patterson, will provide you with all kinds of helpful information about the DIY wind generator or the skystream 3.7 turbine.
Can someone help identify this airplane?
It's here at Daytona Beach Airport, but it's not really on any ramp, I don't think. If it is, it'd be Yelvington. It looks very similar to a DC-3, except it's tricycle gear and four-bladed props. I've been looking around online, but haven't come up with anything. Thoughts?
Nah, only two engines, not four. As far as Curtiss goes, you'll have to be a bit more specific, when I google it, all I see is Warhawks
I'd bet on Convair too. 240/340/440/540/580. Originally piston-engine, but many have been reengined with turboprops.
Burtis completes a seaplane after 23 of work on the craft
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