When I think of the differences between ser and estar, I like to think of ser as the passive verb and estar as the active one. (I'm not using the terms in a grammatical sense here.) Ser tells you what something is, the nature of its being, while estar refers more to what something does.I might use soy (the first-person present of ser) to tell you what I am, but I'd use estoy (the first-person present of estar) to tell you what I am being.I'm not using the terms in a grammatical sense here.) Ser tells you what something is, the nature of its being, while estar refers more to what something does. I might use soy (the first-person present of ser) to tell you what I am, but I'd use estoy (the first-person present of estar) to tell you what I am being.
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A quadcopter, also called a quadrotor helicopter or quadrotor, is a multirotor helicopter that is lifted and propelled by four rotors. Quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is generated by a set of rotors. Quadcopters generally use two pairs of identical fixed pitched propellers; two clockwise and two counterclockwise. These use independent variation of the speed of each rotor to achieve control. By changing the speed of each rotor it is