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Victory: On the attack, edited by Steven Coonts, has a really good PBY Black Cats story.
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That's where I first read about the Lahodney Mount.
From "Black Cat Raiders of WWII", Richard Knott:
"Back at Palm Island, Australia, Patrol Bombing Squadron 52 under Lieutenant Commander H. A. "Hal" Sommer had been readying itself to move north and relieve VPB-11. Here, one of the war's more colorful Black Cat pilots, Lieutenant W. J. "Bill" Lahodney, was deeply involved in a project which he hoped would substantially increase the striking power of the Catalina. Something was needed, he felt, to enable a Cat to press home an attack even after all bombs or torpedoes had been expended. Further, he knew that they would encounter many targets, too small to waste bombs on, which would succumb to an attack by concentrated gunfire.
In his quest for increased firepower, Lahodney made several flights in the Army's B-25 bombers and was impressed with their gunfire capabilities. These planes had 75-millimeter cannon in the nose but also mounted several fixed-quad .50-caliber machine guns which were of particular interest to the Cat pilot. He decided to with the same .50-caliber installation in the nose of his PBY. It was a somewhat radical concept and, as might be expected, there were many raised eyebrows. The PBY after all was a patrol plane, not a fighter, and it was the opinion of some that the fifties would tear the nose off of the airplane. The old Cat was simply not built to take that kind of abuse, they said. Others thought the installation would have an adverse affect on aircraft weight and balance. Few were optimistic that the idea would work.
Lahodney was not to be deterred. Removing the bombsight (which had not proven very effective for the specialized work of the Black Cats) and the small bow plate window, he bolted the guns, mounted two over two, to the keel of the big boat. The top set of two were mounted forward of the lower set, so the muzzles of all four were aft of the angled bow plate. An aluminum panel with four blast tubes extending forward for seven inches replaced the window, and was all that was visible of the lethal addition from an exterior view. An electric trigger on the pilot's yoke, and a selector switch which permitted the pilot to fire the guns individually or together, completed the installation. Bill Lahodney was confident that the Cat would not only withstand the vibration of the fifties, but that the twin thirties normally mounted just above that spot could be retained along with the gunner's position."
"The experiment was a complete success, so much so that quad fifties were installed in at least three planes in every succeding squadron. Other tests also bore out Lahodney's views. They demonstrated that a gunner could straddle the quad mount and operate the thirties with almost as much mobility as before. A burlap pad was placed on the hot .50-caliber barrels to prevent the gunner from being burned."
Awesome aircraft