Reference Cavity Eigenmodes
List of Eigenfrequencies
- 5493 Hz ( "C" shape being mode)
- 5537 Hz (these first two are the first bending modes - degeneracy is split by the blow hole on top)
- 9193 Hz (strange squeezing mode due to the blow hole)
- 12641 Hz
- 12693 Hz (second bending modes: "S" shape)
- 13935 Hz (first longitudinal mode)
- 18480 Hz (torsional mode)
- 20848 Hz
- 20901 Hz (third bending modes)
- 27553 Hz (next blow hole mode)
- 27887 Hz (second longitudinal mode)
This is picture of the first longitudinal mode. f = 13935 Hz, I guess there's a few % error on the frequency due to differences in the real density and groove dimensions. 
First torsional mode (18480 Hz). 