Republic F-105 Thunderchief

Republic F-105 Thunderchief
Name	F-105 Thunderchief
Type	Fighter-bomber
Manufacturer	Republic Aviation
Designer	Alexander Kartveli
First flight	22 October 1955
Introduction	27 May 1958
Retired	25 February 1984
Primary user	United States Air Force
Number built	833
Status	Retired

Republic F-105 Thunderchief. The Republic F-105 Thunderchief was a supersonic fighter-bomber developed for the United States Air Force by Republic Aviation. It was the largest single-seat, single-engine combat aircraft in history and became the primary workhorse for the United States Air Force during the Vietnam War, particularly in the demanding Operation Rolling Thunder bombing campaign. Nicknamed the "Thud" by its crews, it was designed for high-speed, low-altitude nuclear strike missions but was adapted extensively for conventional warfare.

Development and design

The aircraft's genesis stemmed from a 1951 United States Air Force requirement for a supersonic tactical fighter-bomber capable of delivering a nuclear weapon. Led by chief designer Alexander Kartveli at Republic Aviation, the team created an advanced design centered on a large internal bomb bay and a powerful Pratt & Whitney J75 turbojet engine. The design incorporated the innovative Area rule ("Coke bottle" shaping) to reduce transonic drag, and the first YF-105A prototype flew in 1955. Subsequent refinements led to the definitive F-105D model, which featured an all-weather AN/ASG-19 Thunderstick fire control system, a distinctive long nose radome, and improved avionics for its primary mission of penetrating Soviet air defenses at high speed and low altitude.

Operational history

The Thunderchief entered service with the Tactical Air Command in 1958, but its most significant service occurred during the Vietnam War. It bore the brunt of the air war over North Vietnam, flying the majority of strike missions during Operation Rolling Thunder from bases like Korat Royal Thai Air Force Base and Takhli Royal Thai Air Force Base. The aircraft proved vulnerable to surface-to-air missiles and anti-aircraft artillery, suffering heavy losses; nearly half of the 833 built were lost in combat or operational accidents. Notable units included the 355th Tactical Fighter Wing and the 388th Tactical Fighter Wing. Its final combat missions were flown during the 1972 Operation Linebacker II campaign before being phased out of frontline service in favor of the McDonnell Douglas F-4 Phantom II.

Variants

The initial production variant was the F-105B, a day fighter with a M61 Vulcan cannon. The major production model was the all-weather F-105D, which comprised over 600 airframes. The two-seat F-105F and F-105G "Wild Weasel" variants were developed for the specialized SEAD mission, equipped with electronics to detect and destroy North Vietnamese SAM sites; the "G" model was heavily modified with advanced jamming equipment like the AN/ALQ-105. Other variants included the reconnaissance RF-105B (a concept not produced) and the early YF-105A and F-105C prototypes.

Operators

The sole primary operator was the United States Air Force. It served with numerous wings and squadrons within Tactical Air Command and later the Air National Guard. Key units that transitioned to the aircraft included the 23d Tactical Fighter Wing, the 49th Fighter Wing, and Air National Guard squadrons such as the 128th Tactical Fighter Squadron and the 141st Tactical Fighter Squadron. No F-105s were exported to foreign allies under the Military Assistance Program.

Specifications (F-105D)

* **Crew:** 1 * **Length:** 64 ft 4.75 in (19.63 m) * **Wingspan:** 34 ft 11.25 in (10.65 m) * **Height:** 19 ft 8 in (5.99 m) * **Empty weight:** 27,500 lb (12,470 kg) * **Max takeoff weight:** 52,546 lb (23,834 kg) * **Powerplant:** 1 × Pratt & Whitney J75-P-19W afterburning turbojet * **Maximum speed:** Mach 2.08 (1,372 mph, 2,208 km/h) at 36,000 ft (11,000 m) * **Combat range:** 770 mi (1,240 km, 670 nmi) * **Service ceiling:** 48,500 ft (14,800 m) * **Armament:** 1 × 20 mm (0.787 in) M61 Vulcan cannon; up to 14,000 lb (6,350 kg) of ordnance on external pylons and in internal bomb bay, including M117 bombs, AGM-12 Bullpup missiles, and B28 nuclear stores.

Cultural impact

The F-105 earned a legendary, if grim, reputation during the Vietnam War, immortalized by the affectionate nickname "Thud" used by its pilots and in books like Robert Wilcox's *Scream of Eagles*. Its high loss rates and the bravery of its crews, especially those in the hazardous Wild Weasel mission, became a significant part of United States Air Force lore. The aircraft is prominently featured in the memoir *Thud Ridge* by Colonel Jack Broughton and is a subject of study in military history circles analyzing the air war over North Vietnam. Several preserved examples are on display at museums like the National Museum of the United States Air Force at Wright-Patterson Air Force Base and the Steven F. Udvar-Hazy Center.

Category:Military aircraft of the United States Category:Fighter aircraft Category:Cold War aircraft