Summary
Drones: propulsion
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Extract
Better batteries boost drone duration.
Until recently, electric drones have been either lightweight battery-powered aircraft with an endurance of one hour or less, or long-span solar-powered devices that (with energy storage for night-time operation) can stay above the weather for days. Leaps in battery technology are now making possible quiet, efficient, small to medium electric drones with an endurance of several hours.
********** Although still inferior to reciprocating engines in power/weight ratio, electric power emits lower noise and thermal signatures and avoids the logistical problems of battlefield fuel availability. Driv...See the full content of this document
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