Grumman E-1 Tracer

E-1 Tracer
E-1B Tracer
Role	Carrier Airborne early warning
National origin	United States
Manufacturer	Grumman
First flight	17 December 1956
Introduction	1958
Retired	1977
Status	Retired
Primary user	United States Navy
Number built	88
Developed from	Grumman C-1 Trader

The Grumman 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 Grumman E-2 Hawkeye by the 1970s.

The E-1 was designated WF under the 1922 United States Navy aircraft designation system; the designation earned it the nickname "Willy Fudd". Since the S-2 Tracker carrier-based antisubmarine aircraft from which the Tracer was derived 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.

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.

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.

...
Wikipedia