The only one my Dad fired from a PT boat circled around and nearly bagged the boat. Some officers were not too impressed with the ordnance bureau.
Early in the war PT boats were armed with ancient Mk8 torpedoes that were older than their crews and required heavy torpedo tubes.
Later they got new Mk13 aerial torpedoes that could be launched by simply rolling them off the side and they were able to mount more guns with the saved displacement.