Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
Overall, it's about eleven inches, depending on the thickness of the wood of the throat mount plate. Using a little trigonometry, you can find the length you're looking for using the formula length = cos45°(14.5"), about 0.707 times the length of the side 14.5", or approximately 10.25". If you use these figures, the mouth will actually be a little larger than 12" x 24", which is just fine.