Can you develop a more powerful singing voice?

To develop a powerful voice you must put yourself in a situation where you can sing very loud. And often. Those old-time singers didn't have microphones. They had to amplify themselves and got used to it. Vocal power comes from a coordination of muscles and mind. It's all about flexibility. A loud voice sounds awful if it's rigid. You can develop a more powerful singing voice. But you must sing all the time, and loudly whenever possible. Also, powerful can mean two things. 1.) Simply loud and full, balanced, pleasing tone to hear, sustained. 2.) Powerful in the sense that you made the Grinch in the 8th row cry his eyes out.