India’s first fighter, built from scratch

What makes it special

Full specifications

Baseline note: the figures below describe the HF-24 Marut Mk 1, the single-seat ground-attack aircraft Hindustan Aeronautics built at Bangalore around two non-afterburning Bristol Siddeley Orpheus 703 turbojets. Deltas for the two-seat Mk 1T, for the reheat testbeds Mk 1A and Mk 1R, for the Egyptian-engined Mk 1BX and for the never-built Mk 2 are in grey. Four warnings belong in front of the tables, because with this aeroplane the specification sheet is not a description but an indictment. First, the Performance column is the whole argument of the Marut. Kurt Tank and his team at HAL sized the airframe around the Bristol Siddeley Orpheus 12 — the BOr.12, a reheated Orpheus of roughly 30.3 kN (6,810 lbf) dry and 36.3 kN (8,170 lbf) with afterburner. Britain had funded that engine for the NATO light-strike competition; when the requirement was settled by the Fiat G.91 on plain Orpheus power, the reheated development lost its purpose and its money and was cancelled. Bristol Siddeley offered to finish it if India paid the balance, a sum usually quoted at about three million pounds or dollars depending on the account, and the Indian government declined. What flew instead was the plain Orpheus 703 at 21.6 kN, no afterburner, about forty per cent short of the design assumption. Every number in the Performance table therefore measures an underpowered aeroplane rather than the aeroplane that was drawn, and comparisons with contemporaries that got their intended engines are not like for like. Second, the maximum-speed entries. Mach 0.93, or 1,112 km/h at sea level, is the level-flight figure and is well attested. Mach 1.02 is the number quoted everywhere for what a Marut could reach in a dive, and it is the number that makes the point — an airframe stressed and shaped for Mach 2, complete with area-ruled fuselage and thin swept wing, that could only creep past the speed of sound by pointing downhill. It is also a figure repeated far more often than it is sourced; no published flight-test record supports it in detail, and it should be read as service folklore that happens to be consistent with the physics. Third, the thrust rating wobbles. Both 4,850 lbf and 4,900 lbf appear in print for the Orpheus 703. The metric value 21.6 kN converts to 4,856 lbf, so 4,850 is the honest rounding and 4,900 is a secondary error that has propagated widely. Fourth, weights and range. The empty and maximum figures are for a clean aircraft; the combat range of 396 km is a lightly loaded radius quoted by HAL, and squadron experience in 1971 was that a usable war load and a usable radius competed for the same four wing pylons. Where authorities disagree the more conservative figure is given here, with the dispute flagged in the row.

Armament & payload

The Marut fought with four ADEN cannon, iron bombs and a retractable belly pack of rockets, and never in 23 years carried a guided weapon of any kind

The Marut’s armament is the armament of a 1950s light strike aircraft, because that is when it was specified. Four 30 mm ADEN revolver cannon in the lower nose gave it the heaviest fixed gun battery in Indian Air Force service, and a retractable Matra pack of fifty 68 mm rockets in the forward fuselage — extended to fire, faired flush the rest of the time — was a genuinely elegant answer to the drag problem that plagued rocket-armed jets. Beyond that there were four wing pylons and nothing clever: general-purpose bombs, napalm, rocket pods, drop tanks, all aimed through a fixed reflector sight by a pilot with no radar of any kind in front of him. In the Rajasthan and Sindh sector in December 1971 this proved to be enough, because the targets were armour, transport, rail stock and airfields rather than anything that needed precision. Ammunition states, bomb types and pylon fits varied between No. 10 and No. 220 Squadrons and between sorties, and Indian squadron records for 1971 have never been published in a form that would let a loadout be reconstructed with confidence.

The armament was tested in one war. Between 3 and 16 December 1971 Maruts flew more than 300 combat sorties in the western sector, working the Rajasthan and Sindh front from Jodhpur and Uttarlai: close support around Longewala and Ramgarh in the first days, then interdiction across the border towards Naya Chor and Umarkot as the Indian advance developed. Two squadrons flew them, No. 10 Winged Daggers and No. 220 Desert Tigers. No. 31 Squadron, the Lions, is often listed as a third Marut unit of the war and was not one — it flew Mystère IVAs from Sirsa in 1971 and did not convert to the Marut until 1973. Not one Marut was lost to an enemy aircraft. Losses came from the ground: three shot down by anti-aircraft fire and one destroyed on the ground is the usual accounting, though some sources give four and two. Three Marut pilots received the Vir Chakra.

The type’s single air-to-air claim needs stating precisely, because it has hardened into legend in India and is denied outright in Pakistan. What is documented on the Indian side: Squadron Leader K. K. Bakshi of No. 220 Squadron, leading a pair of Maruts on a strike in the Naya Chor area of Sindh, engaged Pakistani F-86 Sabres with his 30 mm cannon and was credited with destroying one, the Sabre’s pilot ejecting. The date is given as 7 December 1971 in most Indian sources and 6 December in others. The victim is usually named as Flying Officer Hamid Khwaja of No. 15 Squadron, Pakistan Air Force. What is disputed: Pakistan does not acknowledge losing a Sabre to a Marut at all, attributing the relevant airframe’s loss to an engine flameout during a pursuit of a Hawker Hunter. That counter-account places the loss over Khushalgarh, several hundred kilometres north of the Sindh desert where Bakshi was flying, which suggests the two sides are not describing the same event and that at least one of the two records has been mis-assembled. No independent reconciliation exists. The honest statement is that the Indian Air Force credits the Marut with one Sabre, that the Pakistan Air Force does not concede it, and that the claim is neither proven nor refuted. The rank is worth fixing too: Bakshi is Squadron Leader in the Indian records, not Flight Lieutenant, a demotion that circulates in secondary accounts.

Sourcing caveat: the gun, rocket-pack and pylon figures are consistent across HAL literature and the standard reference works and can be treated as firm. The three loadouts above are reconstructions from squadron accounts and published mission narratives of the 1971 campaign, not transcriptions of loading sheets, and the split between bombs, rockets and tanks on any given sortie is inferred. Indian Air Force operational records for December 1971 remain largely closed, and Pakistani accounts of the same actions differ on what was carried and what was hit.

Variants

Every Marut variant after the Mk 1 was an attempt to find the aeroplane an engine, and every one of them failed

The variant list of most aircraft records growing capability. The Marut’s records a twenty-year search for thrust. Kurt Tank came to Hindustan Aircraft in 1956 at Nehru’s invitation, with a team of German engineers and a design lineage running from the Focke-Wulf Ta 183 through the Argentine Pulqui II; the Air Staff Requirement asked for a Mach 2 multi-role fighter and the resulting airframe — area-ruled, thin-winged, twin-engined — was capable of it. A full-scale wooden glider, the HAL X-241, was towed aloft behind a Dakota on 3 April 1959 and flew 86 times to prove the aerodynamics. The prototype flew on 17 June 1961 in the hands of Group Captain Suranjan Das, who would be killed in a Marut at Bangalore on 10 January 1970. None of it mattered, because the engine did not exist.

What followed was a decade of substitutions. HAL built its own reheat for the Orpheus 703 and got 18 per cent more thrust, not the 68 per cent the design wanted. India sent a team to Egypt to work with Ferdinand Brandner on the E-300, the engine intended for Messerschmitt’s Helwan HA-300; a Marut was fitted with one and flown from March 1967, the Indian team was recalled in July 1969, and the aeroplane was abandoned where it stood. The Tumansky RD-9F was examined and rejected. The Rolls-Royce RB.153 and the Adour were studied and not bought. The Gas Turbine Research Establishment was founded partly on the lesson and produced nothing the Marut could use in time. The government ordered production before any of this was resolved — 16 pre-production and 60 production aircraft on Orpheus 703 power — which locked in the compromise permanently.

A note on designations: the HSS-73 named in some accounts is the same project as the HF-73, and it was not an engine collaboration but an airframe one — a HAL/Messerschmitt-Bölkow-Blohm strike fighter agreed in 1972 and designated in 1973. It died for exactly the reason the Marut had been crippled: the RB199 it needed could not be obtained, and the Indian Air Force would not accept a second underpowered fighter. India bought Jaguars instead.

HAL X-241 (1959, 1 built)

Full-scale two-seat wooden glider, towed behind a Douglas Dakota to validate the planform. First flight 3 April 1959; 86 flights before it was damaged in a landing accident.

HF-24 prototypes (1961–1962, 2 built)

HF-001 first flew 17 June 1961 (a few sources give 24 June), the second in October 1962. Orpheus 703 power from the outset, because there was nothing else.

HF-24 Marut Mk 1 (from 1964, about 129 single-seaters within a total of 147)

The production single-seat ground-attack aircraft. Entered Indian Air Force service with No. 10 Squadron on 1 April 1967. Planned production was 214 airframes; roughly 147 of all marks were completed.

HF-24 Marut Mk 1A (1 aircraft, converted)

The third pre-production airframe fitted with an afterburning Orpheus 703 giving 18 per cent boost to 25.4 kN (5,720 lbf). Proof that HAL could build a reheat; also proof that 18 per cent was not the answer.

HF-24 Marut Mk 1R (2 aircraft, converted)

Two airframes with a pair of reheated Orpheus 703R engines. The best-performing Maruts ever flown, and still short of the Mach 2 the airframe was drawn for. Never ordered into production.

HF-24 Marut Mk 1BX (1967–1969, 1 aircraft)

Single airframe converted as flying testbed for the Egyptian Brandner E-300, flown from 29 March 1967. Left in Egypt when the Indian team withdrew in July 1969 and never recovered.

HF-24 Marut Mk 1T (from 1970, 18 built)

Two-seat tandem operational trainer, fully combat-capable, marginally longer and heavier with a modest performance penalty. Kept the squadrons converting through the 1970s and outlasted the single-seaters in the training role.

HF-24 Marut Mk 2 (projected, never built)

The re-engined production Marut that never happened: Rolls-Royce Turbomeca Adour in the definitive study, with the Brandner E-300, Tumansky RD-9F and Rolls-Royce RB.153 evaluated at various points. Repeatedly proposed from the mid-1960s, never funded.

HF-25 (projected, never built)

Single-engine derivative around one Tumansky R-25-300 from the MiG-21bis, with redesigned intakes and tail. Substantially heavier than the twin, and dropped.

HSS-73 / HF-73 (1972–late 1970s, projected)

HAL and Messerschmitt-Bölkow-Blohm joint strike fighter of about 17,000 kg, designated in 1973, SNECMA M45 for prototypes and Turbo-Union RB199 for production. Cancelled when the RB199 could not be secured. India bought the SEPECAT Jaguar instead.

Closing note on survivors and disposition. No Marut is airworthy anywhere and none has flown since the type left Indian Air Force charge, usually dated to 1990; squadron histories complicate that date, since No. 10 Squadron converted to the MiG-23 in January 1981, No. 220 in June 1981 and No. 31 in 1983, which leaves the last years to trials and second-line airframes rather than a front-line unit, and some sources give 1985 for the operational end. Between a dozen and twenty original airframes survive, all of them genuine production or pre-production aircraft — no Marut reproduction has ever been built and none is likely to be, so any example encountered is the real thing. Confirmed holdings include the Indian Air Force Museum at Palam, the HAL Heritage Centre and the Visvesvaraya Industrial and Technological Museum in Bangalore, the Aircraft and Systems Testing Establishment at Bangalore, the Air Force Academy at Dundigul, the Nehru Science Centre in Mumbai, the Periyar Science and Technology Centre in Chennai, Kamla Nehru Park in Pune, and Sainik School at Kazhakootam in Kerala. Others stand as gate guardians at Indian Air Force stations, where the count is not published and cannot be verified from open sources. One aircraft went to Germany, to the Deutsches Museum’s Flugwerft Schleissheim and subsequently to the Museum für Luftfahrt und Technik at Wernigerode — the only Marut outside India, and a fitting place for it, since the man who drew it went home to Germany in 1967 without ever seeing his aeroplane get its engine.

From Kurt Tank’s drawing board to retirement

From the programme: twelve Marut stories

The Marut in pictures

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Where the Marut flew

The score that defines it

The Marut was a ground-attack aircraft, and its combat record was written at low level in the 1971 Indo-Pakistani War. Two IAF squadrons flew well over a hundred close-support and interdiction sorties across the western desert in a fortnight of war, and the type proved rugged and dependable. Remarkably for a strike aircraft, it also scored an air-to-air kill — and lost none of its own in air combat.

Compare the combat record of every military aircraft. Figures as of July 2026.

Everything people ask about the HF-24 Marut

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Every fact, checked

• HistoryNet — Kurt Tank’s Indian StormKurt Tank’s arrival, the HAL design team, first flight and the reheat-engine shortfall.
• The National Interest — The Marut Jet FighterThe unfunded reheated Orpheus, the “barely Mach 1” performance and the HF-73 successor.
• Centre for Air Power Studies (CAPS)The Marut’s 1971 war service: squadrons, sorties, the Sabre kill and combat losses.
• Military Factory — HAL HF-24 MarutDimensions, weights, engine thrust, armament and production numbers.
• GlobalSecurity.org — HF-24 MarutAlternative-engine trials (RD-9F, E-300, Orpheus 703R) and the area-ruled airframe.
• Vintage Aviation News — First Flight of the HF-24The 17 June 1961 first flight and the Marut’s place as Asia’s first indigenous jet fighter.
• Defence Update — When the Marut Scored a KillSquadron Leader K. K. Bakshi’s F-86 Sabre shootdown in the 1971 war.
• Bharat Rakshak — IAF History: MarutIndian service history, variants and the type’s retirement in 1990.