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1.The sine wavelength of the opening of the two 90-degree elbows is the length of the middle line of the tube wall: Φx, the wave height is: the lower half is the radius of the outer wall of the tube, and the upper half is the radius of the inner wall of the tube.
2.The sine wave length of the three-section 90-degree bend is still the middle line length of the tube wall: Φx, and the wave height of the outer two sections is: Sin22,5°xΦ. The arc of the middle section is the symmetrical sine wave at the upper and lower ends. If you don't know how to draw a sine wave, you have to use the "division projection" method to find the real long lines, and connect the real long poles into an approximate sine wave.