There is work on unmanned aircraft harvesting power from winds at altitude using kites and beaming it to earth. No, this does not break the laws of physics. Other UAVs are held aloft by lasers and one other project will result in upper atmosphere UAVs that stay aloft for five years just on sunshine.
There is a concept of a military UAV, maybe hybrid electric, which performs its mission then dives like a gannet and hides underwater. Vertical take-off and landing UAVs are now commonplace, the best known being toys that can be programmed in a desired pattern of flight but there are also military and professional civil versions being deployed.
This unique report examines what will be achieved and the enabling technologies that will make it possible. The PhD level analysts at IDTechEx have been studying the subject for many years and initially they encompassed much of this analysis in a popular report on electric aircraft of all sorts. However, there is now so much happening in UAVs alone that this report has been prepared to focus on UAVs alone. No other report is as up-to-date and insightful about this subject.
Read the full report: http://www.reportlinker.com/p04447333-summary/view-report.html
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