During the turn it does seem like the TA acts like a stiff tail in the horizontal plane. At least on the TMA screen of subs. Maybe that is what they meant. And that is perhaps the cause of those erroneous bearing lines before it is straightened. Those lines should not be considered valid and ought to be ignored.
The TA is so long compared to the difference in depth that the curve of it in a vertical sense makes little difference. The 3D view seems to match when it get's dragged along the bottom and starts to flush out. At very low speeds in deep depths the TA seems to droop quite vertical at the end. And iirc the bearing information received from it in those cases was quite wild and not usefull. Suggesting that the angle of the end does affect it's bearing accuracy. I don't think you can use it effectively like a helo's dipping sonar to listen into to the deep sound channel.
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