So are the kinds of multi-rotors we're building considered "Model Aircraft" or "Small Unmanned Aircraft"?
If it's the latter, I think we're all breaking the law in the US.
From:
http://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=14153
Also (not updated since 1981):
If it's the latter, I think we're all breaking the law in the US.
Small Unmanned Aircraft
Small unmanned aircraft (sUAS) are likely to grow most quickly in civil and commercial operations because of their versatility and relatively low initial cost and operating expenses. The FAA is working on a proposed rule governing the use of a wide range of small civil unmanned aircraft systems.
The 2012 reauthorization bill also directed the FAA to “allow a government public safety agency to operate unmanned aircraft weighing 4.4 pounds or less” under certain restrictions. The bill specified these UAS must be flown within the line of sight of the operator, less than 400 feet above the ground, during daylight conditions, inside Class G (uncontrolled) airspace and more than five miles from any airport or other location with aviation activities.
Prior to the congressional action, the FAA and the Justice Department had been working on an agreement to streamline the COA process for law enforcement – an agreement that also meets the mandate. Initially, law enforcement organizations will receive a COA for training and performance evaluation. When the organization has shown proficiency in flying its UAS, it will receive an operational COA. The agreement expands the allowable UAS weight up to 25 pounds.
From:
http://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=14153
Also (not updated since 1981):
Model Aircraft
Recreational use of airspace by model aircraft is covered by FAA Advisory Circular 91-57, which generally limits operations to below 400 feet above ground level and away from airports and air traffic. In 2007, the FAA clarified that AC 91-57 only applies to modelers, and specifically excludes individuals or companies flying model aircraft for business purposes.
The FAA guidance is available at: http://www.faa.gov/documentLibrary/media/Advisory_Circular/91-57.pdf