This is the 12420th most frequent Russian word.
квадрокоптеров
"Квадрокоптеров" means "of quadcopters," referring to multiple four-rotor drones.
Here, 'квадрокоптеров' is in the genitive plural form, implying possession or quantity, referring to 'new quadcopters' purchased for a project.
Я купил несколько новых квадрокоптеров для своего проекта.
I bought several new quadcopters for my project.
In this sentence, 'квадрокоптеров' is in the genitive plural form used to indicate 'the flight' belonging to or concerning 'quadcopters.'
Полёт квадрокоптеров был захватывающим.
The flight of the quadcopters was thrilling.
Here, 'квадрокоптеров' is in the genitive plural form, indicating a workshop specialized in repairing 'quadcopters.'