What attribute should they have to make them more suited than helicopters? Silence ? Energy efficiency ? No landing pad ?
Lower noise, lower operating cost, lower purchase price, easier to pilot, more reliable (fewer parts), safer (redundancy), no emissions, faster time to air, configurable to requirements, etc.
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Lower noise, lower operating cost, lower purchase price, easier to pilot, more reliable (fewer parts), safer (redundancy), no emissions, faster time to air, configurable to requirements, etc.