Quadrotor Unmanned Aerial Vehicles (UAVs) are highly nonlinear and underactuated in nature as they possess fewer control inputs than control variables. A combination multiple UAVs conveying a single load is more complex but offers some advantages due to it’s complimentary nature. as such. heavier loads can be conveyed compared to using single UAVs. https://www.markymarkscott.com/product-category/7-16-c/