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Drones - Airplanes and Rockets

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ScanEagle Unmanned Aircraft System (UAS)

ScanEagle on launching catapultScanEagle flying into arresting ropeRemotely Piloted Vehicles (RPVs) have been around for a long time. They started out in about the 1930s when remote control was beginning to be reliable enough to trust an expensive airborne platform with its equipment. Most early RPVs were target practice drones, but by World War II, top secret programs were using them as decoys and for flying reconnaissance into dangerous areas. The craft were large, heavy, noisy, and cumbersome. It took special piloting skills to fly because automation was minimal or non-existent.

September 1973 American Aircraft Modeler magazine coverFast forward about 40 years and we started to see vehicles like the Sparrow being test flown. The September 1973 edition of American Aircraft modeler did a feature article on it. At the time, such airplanes were considered larger than most modelers could afford, and payloads like cameras were still for the adventurous. Special construction techniques were devised for such serious airplanes. Today, of course, the is a plethora of even ARF planes available at a relatively reasonable cost. The engines pack more power per cubic inch of displacement, the radios are infinitely more reliable, and structural materials now regularly include carbon fiber for strength. What will tomorrow bring?

By the beginning of the 21st century, unmanned aircraft have become so commonplace in the military that officer flight school graduates were no longer required to pilot many of the UAVs. The larger, multi-million dollar systems like the Predator and Reaper drone still have officer pilots, but there are hundreds of smaller UAS packages that are routinely carried in backpacks and employed by enlisted men on the front line. Most take the form of a fixed-wing aircraft, but helicopters are making a big entrance now for instances where the ability to dwell over a target for some time is needed.

One of the biggest difficulties for Unmanned Aircraft Systems is retrieval. It is usually simple enough to launch an aircraft either by hand or from a catapult device, but getting them back on the ground safely can be a real challenge. A number of systems have been implemented in lieu of a wheels landing, including catching by hand for the smallest craft, to flying the UAVs into a net for medium size ones.

The ScanEagle, developed by Boeing and Insitu is a newer type of aerial recovery system that is much more easily deployed than something like a net. It simply hangs a rope vertically and the airplane flies into it so that a hook on the end of the wing snags it. A bungee cord is used with the rope to cushion the impact. A GPS device mounted on the rope assembly steers the ScanEagle right into itself. Pretty neat, eh? The video below shows the system in operation. More American / European ingenuity at work!

The Smithsonian magazine had a short write-up on the ScanEagle retrieval system.



Posted June 25, 2011

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Carpe Diem! (Seize the Day!)

Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD ...

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