to residential areas and in places such as Germany where there are strict noise restrictions. Nitro helicopters have also been converted to electric power by commercial and homemade kits.

The smallest remote-controlled production model helicopter made (Guinness World Records 2014) is the Silverlit Nano Falcon XS sold at many toy stores (although this is infrared controlled, not radio), electronics stores and internet stores, costing about $30 (£28). The next smallest is the Nano Falcon, which previously