It is fairly well documented that in 1934
the US Navy issued the requirement for a new Scout Bomber. This was at the time
the Navy was starting the transition from biplane to monoplane aircraft.
The XSB3U-1 was built as hedge against the
Navy not accepting the XSB2U-1 Vindicator in the 1934-35 time frame. There was
discussion about monoplanes being too large to handle on deck, high approach
speeds, and longer take-off distances, some of the same arguments in the
discussion of progressing from propeller driven aircraft to jets just about 10
years later.
The top speed for the XSB3U-1 was listed
at 215 mph which meant the retractable landing gear bought approximately 10 mph
over the previous SBU-1/-2 aircraft that it was intended to replace. That speed
was a good 30 mph slower than the SB2U-1.
One XSB3U-1 was built and the contract
went to Vought to build the SB2U series. Here is a general arrangement for the
XSB3U-1 from the Vought Heritage Archives
In the end the XSB3U-1 was the last vestige of the biplane dive bomber line at Vought that started with the end of another era, the two seat fighter (pilot and rear gunner) XF3U-1. The XSBU-1 was the XF3U-1 prototype re-purposed into the dive bomber series SBU-1 and SBU-2.
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