Crossword clues for the word: MACHONE The word MACHONE has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for MACHONE Showing 1 to 9 of 9 results Clue(s) Chuck Yeager reached it in 1947 Chuck Yeager was the first to reach it Number indicating supersonic speed. Number that Yeager famously exceeded Sonic boom speed Speed equaling sound Speed of sound Supersonic threshold The speed of sound