How many attempts did the Wright Brothers make before achieving powered flight?

The Wright Brothers' journey to achieving powered flight was not a simple or quick endeavor. They engaged in several years of trials and experiments, meticulously working through the challenges of developing a successful heavier-than-air flying machine. Their process involved extensive research, the design and construction of various gliders, and the iterative testing of these designs to gather data on lift, control, and stability.

The years of effort included their famous 1902 glider tests that revealed critical insights into aerodynamic control, which were foundational to their powered flight development. This extensive period of experimentation was essential in guiding their design choices for the 1903 Flyer. Thus, stating that the Wright Brothers conducted several years of trials and experiments accurately reflects the dedication, persistence, and scientific method they employed, ultimately leading to their historic success in December 1903.