See greg hoffmans schnellboot video. schellboot 1/20th torpedo tubes. schnellboot 1/20th hull updates. schnellboot struts and rudders cast in silicon bronze. The following images show dimensions for the browning .50 caliber aircraft machine gun as used on ww2 pt boats. these dimensional images represent a best effort on my. This is pt-728, a 66 1/2 year-old restored patrol torpedo boat from world war ii. with a keel laid on august 10, 1945, she is one of 12 remaining pt boats in the.