I knew that there's no automatic drop in Blenheim. What I meant is that, while in BR.20 (also with manual drop) once adjusted the bombsight stays still until I adjust it again accordingly to the final speed and altitude, in Blenheim when I shift to the bombardier position (and the aircraft is descending for final approach) the bombsight is moving exactly like when I am setting it. The graduated ring on its top rotates without any influence from me. It looks as if there was an automatic regulation on the current values of speed and altitude.
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