The nuclear bomber that fought a conventional war

What makes the F-105 special

Full F-105D specifications

Baseline note: the figures below describe the single-seat F-105D in the form it flew over North Vietnam — one Pratt & Whitney J75-P-19W turbojet with water injection, the AN/ASG-19 Thunderstick fire-control system built around a NASARR R-14A radar, an M61A1 rotary cannon in the port side of the nose and, on very nearly every combat sortie, a fuel tank rather than a bomb inside the bomb bay. That is the right baseline because the D was the Thunderchief: 610 of the 833 airframes completed were F-105Ds, and they flew the majority of United States Air Force strike sorties against North Vietnam in the first years of the war. Deltas for the earlier F-105B and for the two-seat F-105F and F-105G Wild Weasel are in grey. Eight warnings before any number below is read. First, and most important, the loss figures, because they are quoted more loosely than those of any other American aircraft. Two tallies circulate in reputable works and both appear in the same reference sources: 382 aircraft lost of 833 built, of which 62 were operational rather than combat losses; and 395 F-105s lost in South-East Asia, of which 334 fell to enemy action — 296 F-105Ds and 38 two-seaters — and 61 to operational accidents. The two are not reconcilable by arithmetic and the difference lies in whether aircraft written off after recovery, destroyed on the ground, or lost outside the South-East Asia theatre are counted. What both agree on is the thing that matters: 296 F-105Ds destroyed by the enemy against 610 built is 48.5 per cent of the single-seat fleet, and over the whole life of the type roughly 612 of the 833 airframes ever built were destroyed in accidents or in combat. Second, production. The 833 total is a fleet figure and only adds up if you count everything: 2 YF-105A, 4 YF-105B, 71 F-105B, 610 F-105D, 143 F-105F and 3 JF-105B. Anyone quoting the F-105B as more than 71 aircraft is folding the prototypes into the production run. Third, maximum speed. Mach 2.1 at 35,000 ft is the specification figure for a clean aeroplane on a test card. A Thunderchief carrying six 750 lb bombs, two 450 US gallon tanks and a jamming pod was a transonic aircraft, and the speed that actually kept crews alive was the low-level dash, where the F-105 was the fastest thing in the theatre and the canopy could go milky from kinetic heating. Fourth, range. The 676 nautical mile combat range is a range and not a radius. Missions from Takhli and Korat to Route Package Six required two or three tanker contacts, and the F-105 campaign was as much a tanker campaign as a bombing one. Fifth, ordnance. 14,000 lb is the quoted total capacity across bay and pylons; the bomb bay alone was rated at about 8,000 lb; and a representative Rolling Thunder load was six M117s, some 4,500 lb, because fuel and jamming pods took the rest. Sixth, the bomb-bay tank. Its capacity is given as 390 US gallons in the standard specification tables and as 350 US gallons in other accounts of the same installation; both circulate and neither is obviously wrong. Seventh, gun ammunition: 1,028 rounds is the usual figure, 1,029 appears almost as often, and at close to 6,000 rounds per minute the difference is a tenth of a second. Eighth, a correction that keeps propagating: the engine is a Pratt & Whitney J75. The Smithsonian’s own online object record for its F-105D calls it a General Electric J75-P-19W, which is wrong, and the error has been copied widely.

Armament & payload

The Thunderchief was designed around a bomb bay it hardly ever used and saved by a gun nobody thought it would need

Everything about the F-105’s armament follows from a single sentence in the requirement: one thermonuclear bomb, carried internally, delivered at very low level and very high speed after a one-way dash into the Warsaw Pact. That is what the 15 ft 10 in bay in the belly is for, that is why the wing is too thin to hold fuel or pylons of any size, and that is why the aeroplane has the acceleration of a missile and the turning circle of a lorry. It never dropped a nuclear weapon. What it dropped instead, for eight years, was iron: M117 750-pounders in sixes and eights, hung on external racks the airframe had never been designed around, while the bomb bay held a ferry tank because the fuel had to come from somewhere.

Two weapons rescued the type’s reputation. The first was the M61A1 Vulcan, fitted almost as a courtesy to the fighter lobby and mounted low on the port side of the nose. Twenty-four and a half of the Thunderchief’s 27½ air-to-air victories were scored with it, all of them against MiG-17s, and in 1966 and 1967 F-105 pilots shot down more MiG-17s than the F-4 Phantom II crews escorting them. That is a genuinely strange statistic: a bomb-laden fighter-bomber out-killing its own escort, with a gun, because the escort’s missiles did not work and the Thud had one thing the MiG-17 could not match, which was the ability to accelerate away from anything at low level once the bombs were gone.

The second was the anti-radiation missile, and it changed air warfare permanently. When the SA-2 Guideline appeared over North Vietnam in 1965 there was no established way to fight a radar-guided surface-to-air missile system, so the Air Force invented one, and the two-seat F-105F was the aircraft it invented it in. The AGM-45 Shrike and later the much larger AGM-78 Standard ARM homed on the Fan Song fire-control radar itself. The tactics that grew around them — hunting the site, provoking it into transmitting, killing it before the strike package arrived, and staying over the target area until the last bomber had left — are the origin of every suppression-of-enemy-air-defences doctrine flown since. Fits varied sharply by mark, year and mission: the F-105B carried far less conventional ordnance until Project Look-Alike quadrupled the fit, no single-seat F-105D ever carried a Standard ARM, Sidewinder rails were often left off to save drag, and from 1966 an outboard pylon that might have held a bomb usually held a jamming pod instead.

Sourcing caveat. Weapon fits are drawn from USAF technical orders, unit histories and the standard published accounts, and they varied from wing to wing, month to month, and with the pilot’s own judgement about drag. The 27½ aerial victory total is the official USAF credit and individual claims have been revised more than once; North Vietnamese records of their own MiG-17 losses do not match the American credits, as is true across the whole war. The 14,000 lb ordnance figure is a structural capacity, not a load anyone flew. Shrike hit rates around 25 per cent come from crew recollection rather than from instrumented assessment, and no reliable independent count exists of how many SA-2 sites were actually destroyed by anti-radiation missiles as opposed to being merely silenced.

Variants

The Thunderchief has three production marks, no export customers at all, and one conversion that invented a whole branch of air warfare

The F-105 has a short variant list for an aircraft built in such numbers, and an unusually honest one: almost every proposed mark was cancelled, nothing was ever licence-built, and not a single Thunderchief was ever sold abroad. It served with one air force, the United States Air Force, and with nobody else. That is rare for a Century Series type — the F-100, the F-104 and the F-5 all went overseas in quantity — and it is a consequence of what the aeroplane was: a specialised nuclear penetrator, expensive, thirsty, demanding of runway and of maintenance, and useless to any air force that did not have American nuclear weapons to deliver and tankers to reach the target.

The origin is Republic’s own money. Alexander Kartveli’s team began the AP-63 study in 1950 and worked through something like 108 configurations before settling on the layout, submitting it to the Air Force in April 1952. A letter contract for 199 aircraft followed that September and was then cut, restored and cut again through the post-Korea budget years until a February 1955 contract for two YF-105As, ten F-105Bs and three RF-105As finally produced hardware. Plans that once ran past 1,500 aircraft were curtailed once the F-4 Phantom II showed that a Navy fighter could do more of the Air Force’s work than the Air Force had expected. Production ended in 1964 at 833 airframes.

The aircraft then spent its career doing the opposite of what it was designed for, and paid for it. Conventional bombing of defended fixed targets in daylight, repeatedly, along predictable routes dictated by Washington target lists, is close to the worst possible employment of a single-engine aircraft with its fuel in the fuselage and both hydraulic runs in the same tunnel. The F-105 is the only American aircraft ever withdrawn from a combat theatre because it was being destroyed faster than it could be replaced — production had ended in 1964 and there was no way to make more. The last F-105D unit, the 355th Tactical Fighter Wing, left South-East Asia in October 1970. The Weasels stayed until the end.

Two men were awarded the Medal of Honor flying F-105Fs, five weeks apart, both on defence-suppression missions, and both stories are worth stating exactly. On 10 March 1967, over the Thai Nguyen steel works, Captain Merlyn H. Dethlefsen and his electronic warfare officer Captain Mike Gilroy had their aircraft damaged by flak and were then attacked by MiGs. Rather than leave, they stayed in the target area, evaded the MiGs, and went back through the defences repeatedly until the SAM site was destroyed. On 19 April 1967, Major Leo K. Thorsness of the 355th TFW at Takhli, flying F-105F 63-8301 as Kingfish 01 with Captain Harold E. Johnson behind him, destroyed one SA-2 site with a Shrike and a second with cluster bombs, shot down a MiG-17 with the cannon when his wingman’s crew was shot down and their parachutes came under attack, damaged a second MiG, refuelled, and then went back alone, out of ammunition and short of fuel, to fly cover for the rescue attempt — and finally passed his own tanker to another aircraft in worse shape than his, landing at Udorn with the gauges reading empty. Eleven days later, on 30 April 1967, Thorsness and Johnson were shot down by a MiG-21 and both were captured. Thorsness spent almost six years as a prisoner of war and was released on 4 March 1973; his Medal of Honor had been approved while he was in captivity and was not announced until he came home, for fear of what his captors would do with it.

YF-105A (1955–1956, 2 built)

Prototypes flown with the interim Pratt & Whitney J57-P-25 because the J75 was not ready, and without area ruling. First flight 22 October 1955, and supersonic on that first flight, which flattered a design that was in fact well short of its promised performance. Both were used for development and neither resembled the production aircraft in the two features that matter most, the waisted fuselage and the forward-swept intakes.

YF-105B (1956–1957, 4 built)

The aeroplane as it was meant to be: J75 power, an area-ruled fuselage and the Ferri forward-swept variable-geometry inlets. First flight 26 May 1956. The transformation between the A and the B is one of the clearest demonstrations anywhere of what the area rule was worth.

F-105B (1958–1959, 71 built)

The first production mark, with the MA-8 fire control, an E-34 ranging gunsight and an E-30 toss-bombing computer — a clear-weather nuclear striker. Entered service with the 335th TFS of the 4th TFW in May 1958 and was declared operational in January 1959. Nine were flown by the Thunderbirds in 1964 for six shows before a fatal structural failure returned the team to the F-100D. The B never went to Vietnam; it served out its life with the Air National Guard into 1981.

RF-105B and JF-105B (1956–1959, 3 completed)

A dedicated tactical reconnaissance Thunderchief with a camera nose was ordered and cancelled; three airframes were completed instead as JF-105B test aircraft with modified noses but no cameras, and used for stores separation and development trials. The Air Force bought RF-101 Voodoos and later RF-4Cs for the job.

F-105C, F-105E and F-105H (proposed 1957, 1959 and later; none built)

Two proposed two-seat trainers, cancelled in 1957 and 1959 respectively when the money went to combat aircraft, and a much later proposed upgrade that never left paper. The trainer role was eventually filled by the F-105F, which is why the F designation follows the D with two gaps in between — a source of endless confusion in variant lists.

F-105D (1959–1964, 610 built)

The definitive aircraft and the baseline for this page. J75-P-19W with water injection, AN/ASG-19 Thunderstick fire control with NASARR R-14A radar, Doppler navigation and genuine all-weather capability. First flight 9 June 1959. Grounded repeatedly between 1961 and 1967 for fuselage frame fatigue, wiring chafe, fuel system faults and engine problems, with about $51 million spent on fixes, and brought to a common standard by Project Look-Alike from 1962 to 1964. Flyaway cost about $2.14 million per aircraft. This is the mark that flew the war and this is the mark that was destroyed in it.

F-105D Thunderstick II (1969–1971, 30 modified)

Thirty aircraft given AN/ARN-92 LORAN and an improved bombing computer, unmistakable for the long dorsal spine running the length of the fuselage from canopy to fin. Credited with about 50 ft accuracy in blind bombing from 15,000 ft. By the time it was ready the bombing of the North had stopped and the aircraft were in reserve units.

F-105F (1963–1964, 143 built)

The two-seat, dual-control, fully combat-capable version. None was ordered as an F: all 143 were F-105Ds on contract that were completed as two-seaters. About five feet longer, a taller and larger fin, some 2,000 lb heavier, and within a couple of per cent of the single-seater’s performance. Its Commando Nail aircraft, flown by the hand-picked crews known as Ryan’s Raiders, had modified radar and release systems for all-weather low-level night attack on the North, the first mission on 26 April 1967.

EF-105F Wild Weasel III (1966–1967, about 86 airframes designated for modification)

The aircraft that made suppression of enemy air defences a permanent discipline, following the F-100F Wild Weasel I and the failed F-4C Wild Weasel II. Fitted with AN/APR-25 and APR-26 warning and launch receivers, the ER-142 panoramic receiver and Shrike capability, and flown from the summer of 1966. The casualties were appalling from the start: five of the first eleven aircraft were lost by the end of August 1966. Published counts of aircraft actually converted range from 54 to 86 depending on whether one counts airframes designated, modified or delivered, and the discrepancy has never been reconciled.

F-105G (1967–1970, 61 converted from F-105F)

The definitive Wild Weasel: AN/APR-35, APR-36 and APR-37 homing and warning sets, the AN/ALR-31 wingtip installation, AGM-78 Standard ARM capability on 30 aircraft, and two AN/ALQ-105 jamming transmitters in fuselage blisters so that the pylons could carry weapons instead of pods. It flew with the 357th TFS, 12th TFS, 17th Wild Weasel Squadron and 6010th WWS in the theatre, then with the 561st and 562nd TFS of the 35th TFW until the F-4G replaced it in 1980, and finally with the 128th TFS of the Georgia Air National Guard.

Closing note on retirement and survivors. The last F-105G was retired by the 128th Tactical Fighter Squadron of the Georgia Air National Guard on 25 May 1983, and the last F-105 flight of any kind was made on 25 February 1984 by the 466th Tactical Fighter Squadron, Air Force Reserve, at Hill AFB, Utah. No Thunderchief has flown since. None is airworthy, none is civil-registered, and given the J75, the airframe hours and the fatigue history there will not be one; the type is a museum aeroplane and will stay one. Roughly 105 complete airframes survive in museums, on gate guard duty and in storage, a figure compiled to May 2021 and subject to slow attrition as outdoor aircraft in poor condition are scrapped. The reason so few remain is arithmetic rather than neglect: about 612 of the 833 built — something close to three quarters — were destroyed in combat or in accidents over the type’s service life. Every survivor is an original Republic airframe; there are no reproductions of an F-105 and there never will be, since nobody is going to build a replica of a 24-tonne supersonic fighter-bomber. Notable examples include F-105D 60-0445 at the Smithsonian’s Steven F. Udvar-Hazy Center in Virginia, restored to the 421st TFS markings it wore at Korat in 1967; F-105D 60-0504 and F-105G 63-8320 at the National Museum of the United States Air Force at Wright-Patterson AFB; F-105G 63-8300 at the Musée de l’Air et de l’Espace at Le Bourget, one of the very few Thunderchiefs outside the United States; F-105G 62-4416 at the Joe Davies Heritage Airpark at Palmdale; and F-105D 62-4299 at the Veterans Memorial Museum, Chehalis, Washington. Leo Thorsness’s Medal of Honor aircraft, F-105F 63-8301, is not among them.

From nuclear striker to Vietnam workhorse

From the cockpit: twelve Thunderchief stories

The Thunderchief in pictures

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The F-105 Thunderchief in motion

Wings Over the Rockies Air & Space Museum — one of the most-watched F-105 Thunderchief films on YouTube.

Where the Thunderchief served

The score that defines it

The F-105’s record is a study in contradiction: a strategic nuclear bomber that fought a conventional war, took the heaviest losses of any American aircraft in Vietnam, and still shot down MiGs with its gun. Its combat figures — especially the loss numbers — vary between sources and should be read as widely-cited estimates rather than exact accounts.

Two of the Thud’s Wild Weasel pilots — Merlyn Dethlefsen and Leo Thorsness — received the Medal of Honor. Compare the combat record of every military aircraft. Figures as of July 2026.

Everything people ask about the F-105 Thunderchief

Continue the tour

Every fact, checked

• National Museum of the U.S. Air ForceOfficial F-105 fact sheets: development, variants, service history and specifications.
• AirVectors — Greg GoebelDetailed technical and operational history of the Thunderchief and its variants.
• The Aviation Geek ClubThe F-105 loss rate during Rolling Thunder and the eight-month attrition warning.
• We Are The MightyThe Wild Weasel mission, YGBSM, and how the Weasels cleared the skies over Vietnam.
• 19FortyFiveThe Thud’s reputation, MiG-kill tally and loss statistics in Vietnam.
• Military FactoryDimensions, weights, engine and armament specifications for the F-105D.
• Vietnam Air Losses (Chris Hobson)Reference record of USAF aircraft losses over Southeast Asia, including the F-105.
• Smithsonian National Air and Space MuseumReference for preserved F-105 airframes and the Medal of Honor Wild Weasel actions.