On the other hand , 12 known defects seemed to preclude immediate success in converting the Mark 13 into an effective aircraft torpedo .
The first alternative involved predictable delay , since the Bureau estimated that 2 years would be required to move a weapon from conception to production .
12 known defects seemed to preclude immediate success in converting the Mark 13 into an effective aircraft torpedo .
The first alternative involved predictable delay , since the Bureau estimated that 2 years would be required to move a weapon from conception to production .