Like I said, "Ship Borne Dive-Bomber" gets high marks for creativity. But it's obviously wrong, and it doesn't matter how often it's repeated.
If you're still struggling with SBD, a look at the 1922 Naval aircraft designation system, which remained in effect until 1962, should turn the trick.
https://en.wikipedia.org/wiki/1922_United_States_Navy_aircraft_designation_system
"The system conveyed its information in the form:
"(Mission)(Design Number)(Manufacturer)-(Subtype)(Minor Modification)
"For example, F4U-1A referred to the first minor modification (A) to the first major subtype (1) of Chance-Vought's (U) fourth (4) fighter (F) design."
..."The mission of the aircraft was designated by a one or two letter code....
"SB -- Scout bomber (dive bomber)...
"In cases where an aircraft was its manufacturer's first design of that mission, the 1 would not be written. Thus Consolidated’s Patrol plane was the PBY, not PB1Y...."
"The codes used to denote manufacturers were not unique to a single company....
"D
Douglas
McDonnell
Radioplane
Frankfort..."
See also:
http://www.hazegray.org/faq/designat.htm#t1-2-1
