Experiment soon revealed that optimum water entry angles were approximately 22 - 32 degrees relative to the plane of the surface : the torpedo might plunge as deep as 50 feet .
Torpedo would return to torpedo 's set depth and bearing if the mechanism was undamaged .
Experiment soon revealed that optimum water entry angles were approximately 22 - 32 degrees relative to the plane of the surface : the torpedo might plunge as deep as 50 feet but it would return to its set depth and bearing if the mechanism was undamaged .