Staff Writer (Updated: 1/18/2015):
Origins of the Trader stemmed from a United States Navy requirement for a modern anti-submarine carrier-based warplane. In 1950, Grumman delivered on the response with their Model G89 product, a rather compact, twin-engine, propeller-driven design. The United States Navy assigned the prototype designation of XS2F-1 to the Grumman model and first flight was achieved on December 4th, 1952. Developmental models carried the designation of YS2F-1 up until 1962. Two prototypes were produced and these were followed by fifteen developmental airframes. However, while this program went on to produce the Anti-Submarine Warfare-minded "S2F-1 Tracker", the "TF-1 Trader" was born from the S2F Tracker (as was the "WF-2 Tracer"). Deliveries commenced in 1954. In comparison, the Trader saw production totals peak at only 87 examples while the Tracker went on to be produced in some 1,284 total examples.
The TF-1 Becomes the C-1, Births the TF-1Q and Evolves the WF-2
The TF-1 featured a cabin area that could be setup to ferry up to up to nine adult passengers or up to 3,500lbs of goods. She was branched off into an Electronic CounterMeasures variant in the converted "TF-1Q", of which only four existed (as part of the 87 production total). The Trader program was further developed to include a modified Airborne Early Warning (AEW) platform originally known as the "TF-1W" and this project became the radome-mounting "WF-2 Tracer" (itself ultimately to become the "E-1 Tracer" after the 1962 redesignation). 1962 saw a restructuring in the way the United States Military designated their aircraft, resulting in an all-new designation for the Trader series. She gave up her original TF-1 designation to become the "C-1A". Similarly, the TF-1Q became the "EC-1A" that same year. Other aircraft in the USAF, USN, USMC and US Army inventories followed suit.