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If you look at the propeller, it appears to have extended pitch range on the counter weight brackets. I have seen some of these at the Hamilton Standard factory in Windsor Locks, about 1987, in the underground passage way, mounted on the walls on the way to the cafeteria between the plant buildings.U.S. Navy Vought XSB2U-1 Vindicator prototype with wings folded on January 2, 1936. The prototype will make its first flight in two days. The Vindicator was the first monoplane to be used in the dive bombing role. In some respects it was a considerable advance; but its propeller braking system was not satisfactory. The type remained in service through the first half of World War II but had already been replaced in front line Navy and carrier units by the superior Douglas Dauntless. The type still served in Marine squadrons for a while, however. VMSB-241's Vindicators saw combat at the Battle of Midway in June 1942. Airmen with experience in more modern aircraft spoke disparagingly of SB2Us as "vibrators" or "wind indicators" in their later combat assignments.
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B-17G 42-31367 "Chow Hound" of 91st Bomb Group 322nd BS on the way to Berlin on March 8 1944
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