He helped design the company's first successful product, the Boeing Model C, more than 50 of which the U.S. Navy purchased. In light of the financial windfall brought from the Navy purchases, "from Bill Boeing onward, the company's chief executives through the decades were careful to note that without Wong Tsu's efforts, especially with the Model C, the company might not have survived the early years to become the dominant world aircraft manufacturer."
He played a key role in designing the company's first profitable product, the Boeing Model C, which garnered significant orders from the U.S. Navy, resulting in substantial financial gains. As a result, subsequent CEOs emphasized that without Wong Tsu's contributions, particularly with the Model C, the company might not have endured its early years to become the world's leading aircraft manufacturer.