Grumman E-1 Tracer

The E-1 Tracer was the first purpose built airborne early warning aircraft used by the United States Navy. It was a derivative of the Grumman C-1 Trader and first entered service in 1958. It was replaced by the more modern E-2 Hawkeye in the early 1970s.

Design and development
The E-1 was designated WF under the old US Navy system; the designation earned it the nickname "Willy Fudd". Since the S-2 Tracker was known as S2F under the old system, that aircraft was nicknamed "Stoof"; the WF/E-1 with its distinctive radome gained the nickname "Stoof with a Roof." The E-1 featured folding wings for compact storage aboard aircraft carriers. Unlike the S-2 and C-1 in which the wings folded upwards, the radome atop the fuselage necessitated the E-1 to fold its wings along the sides of the fuselage.

Radar
The Tracer was fitted with the Hazeltine AN/APS-82 in its radome and fuselage. The radar featured an Airborne Moving Target Indicator (AMTI), which compares the video of one pulse time to the next in reflected radar energy to distinguish a flying aircraft from the clutter produced by wave action at the ocean's surface. The energy reflected from an aircraft changes position rapidly compared to the energy reflected from the surrounding sea. Separating a moving object from stationary background is accomplished by suitable hardware.

Operational history
As one of the first carrier based early warning aircraft, the E-1 Tracer served from 1958 to 1977, although considered only an interim type, being replaced by the Grumman E-2 Hawkeye in the mid-1960s. During the early years of the Vietnam War, E-1s saw extensive service, providing combat air patrol (CAP) fighters with target vectors, and controlling Alpha strikes over North Vietnam. With a radius of 250–300 miles, the E-1B served as an early warning to strike aircraft, of enemy MiG's activity.

By May 1973, most E-1Bs were retired, with only four RVAW-110 Tracers based at NAS North Island, California, still in service. These aircraft were soon retired during mid-summer 1977 following a final cruise on board the USS Franklin D. Roosevelt (CV-42) and were ferried to the Davis-Monthan storage facility. The E-1B Tracer was struck from the inventory by 1977.

Variants

 * XTF-1W
 * aerodynamic prototype (BuNo 136792) without electronics, later rebuilt as a standard C-1A, retaining the twin tail.


 * XWF-1
 * The XTF-1W re-designated in the W-Warning category.


 * WF-2
 * Production Airborne Early Warning version of the TF-1 Trader, redesignated E-1B in 1962, 88 built.


 * E-1B
 * WF-2 redesignated in 1962.

Operators

 * United States Navy
 * United States Navy

Aircraft on Display
There are five Tracers on museum display including an E-1B Tracer on the flight deck of the USS Yorktown (CV-10) at Patriot's Point Naval and Maritime Museum in Mount Pleasant, South Carolina, another at the Intrepid Sea-Air-Space Museum in New York City and one at the New England Air Museum.