A homegrown torpedo failed to hit the target again in the latest test-firing conducted earlier this month, an official said Sunday, raising questions about possible faulty designs and casting clouds over the prospect of resuming its production. The Navy has test-fired four rounds of the torpedo, named \"Hongsangeo,\" or \"Red Shark,\" since July in waters off the east coast. The first three rounds hit the target, but the final one went off the mark, the official at the Defense Acquisition Program Administration said.