What was one of the key challenges faced by the Wright Brothers during their quest for flight?

One of the key challenges faced by the Wright Brothers during their quest for flight was the development of a lightweight propulsion system. In the early 1900s, existing engines were either too heavy or not powerful enough to allow a manned aircraft to take off, achieve sustained flight, and land safely. The Wright Brothers needed an engine that could provide sufficient thrust without adding excessive weight to their aircraft.

They realized that to achieve powered flight, they had to design and build an engine specifically for their needs. This led them to create a four-cylinder internal combustion engine, which they constructed themselves, using materials available to them at the time. The innovative engine they developed not only met the weight and power requirements but also played a significant role in their first successful manned flight at Kitty Hawk in 1903.

Finding a suitable location for tests, securing patents for their designs, and improving public perception of their work were also important aspects of their journey, but the challenge of creating an effective propulsion system was fundamental to achieving the goal of powered flight.