It turned out that "Mach 4" referred to a speed of approximately 4,900 miles per hour, four times the speed of sound. Jack knew that achieving such speeds was no easy feat, especially for a hobbyist like himself. However, he was intrigued by the challenge.
After months of trial and error, Jack and his team finally had a breakthrough. They developed a sleek, miniature aircraft that incorporated the design principles they had studied. The aircraft was powered by a custom-built propulsion system, which utilized a combination of advanced materials and clever engineering. mach 4 hobby crack better 23
The number "23" seemed to be a reference to a specific design or configuration that had shown promise. It turned out that "Mach 4" referred to