Airbus A400M Atlas

Airbus · Europe · first flew 2009 · transport aircraft

A four-engine turboprop military transport designed to bridge the gap between tactical and strategic airlift, carrying outsized loads into short, rough strips.

Recognition (WEFT)

W — Wings	High-mounted, swept
E — Engines	4 × turboprop, wing-mounted
F — Fuselage	Tall T-tail above an upswept rear fuselage with a loading ramp
T — Tail	T-tail

WEFT is AircraftIQ's four-point recognition method — how it works.

Spot it by:

Four turboprops with distinctive scimitar-shaped swept blades
High swept wing; props on each wing turn in opposite directions
Tall T-tail above an upswept rear fuselage with a loading ramp

The A400M is identified by its four turboprops swinging broad, scimitar-like swept blades, with the props on each wing rotating in opposite directions. A tall T-tail tops a deep fuselage that sweeps up at the rear to a cargo ramp, and the wing is set high and slightly swept.

Specifications

The Airbus A400M Atlas has a length of 45.1 m (148 ft).
It has a wingspan of 42.4 m (139 ft).
Its maximum speed is 780 km/h (485 mph).
Typical crew: 3 or 4.

Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.

History

Developed by Airbus for a consortium of European air forces to replace the C-130 Hercules and C-160 Transall, the A400M first flew from Seville on 11 December 2009. After a protracted and expensive development it entered service in 2013 and has matured into a capable, modern airlifter.

Variants

The A400M is essentially a single baseline aircraft, the A400M Atlas, rather than a family of distinct variants. Capability has grown through software and hardware upgrades adding tactical air-to-air refuelling, paratroop dropping and automatic low-level flight, with detail differences between national customer fleets.

Where you'll see it

The Royal Air Force operates the Atlas C1 from RAF Brize Norton in Oxfordshire, where it forms a core part of the UK's air mobility force alongside the C-17 and Voyager. The big turboprop is a popular airshow performer, often demonstrating its agility at the Royal International Air Tattoo at RAF Fairford.

In depth

The A400M is the rare modern transport that chose propellers on purpose, and the choice runs deep into its role. Its Europrop TP400-D6 engines are the most powerful turboprops ever fitted to a Western military aircraft, and turboprops were selected over turbofans because the Atlas is meant to bridge the strategic and tactical worlds — to cruise high and fast enough to be useful over long distances, yet still operate from short, soft, unprepared strips. A turboprop is markedly more fuel-efficient than a turbofan at the medium altitudes and speeds where this aircraft spends much of its time, and a high-mounted propeller ingests far less dirt, grass, and debris than a low-slung fan intake, which matters enormously when landing on a dirt runway where a jet would risk foreign-object damage. The trade is a lower top speed and ceiling than a pure jet, accepted because the tactical mission rewards efficiency and rough-field tolerance over outright speed.

The engine arrangement hides a subtlety worth learning to see. The A400M does not simply run all four propellers the same way; each wing carries a contra-rotating pair, so that on a given wing the inboard and outboard propellers turn in opposite directions. This is not for show. Ordinarily a bank of propellers all spinning the same way produces a strong asymmetric swirl and a large critical-engine problem, where losing one outboard engine creates a much bigger yawing moment than losing another. By making the two propellers on each wing turn towards or away from each other, the designers cancel much of the net torque and swirl and make the handling far more symmetric — engine-out control is gentler and the aircraft behaves more predictably at the low speeds of a tactical approach. The pattern is genuinely observable: in slow-motion video or a sharp still, the inboard and outboard blades on one wing are clearly rotating in opposite senses, a detail that instantly separates the A400M from any conventional four-turboprop transport.

The blades themselves are the other signature. Each engine swings an eight-bladed propeller with a pronounced scimitar sweep, and the sweep exists for the same physical reason wings are swept on jets. A propeller this large runs its blade tips at very high speed — approaching the transonic region at cruise RPM — and if the tips went supersonic they would generate shockwaves, wave drag, and a great deal of noise. Sweeping the blade back near the tip delays and softens that compressibility, recovering efficiency and cutting noise, exactly as a swept wing tames wave drag on an airliner. Eight slender swept blades per engine also let a lot of power be absorbed by a propeller of manageable diameter.

That blade count is the fastest way to separate the Atlas from a Hercules. The C-130J turns six-bladed propellers, and older Hercules four; the A400M's eight-bladed, sharply scimitar-swept props are unmistakable once counted. Reinforce it with planform and size: the A400M's wing is noticeably swept and it sits on a tall T-tail, whereas the Hercules has an essentially straight wing and a conventional low tailplane, and the Atlas is a substantially larger aircraft overall. High wing, rear ramp, and upswept tail are shared, so it is the swept wing, the T-tail, the size, and above all the eight swept blades that fix the identification.

For the spotter, the A400M has become a familiar sight at a handful of key bases and shows. In the UK the RAF's Atlas fleet operates from Brize Norton, sharing the ramp with the C-17 and Voyager, and the type is a popular and energetic display performer at the Royal International Air Tattoo at Fairford, where its steep, agile handling belies its size. Across the Channel the French fleet flies from Evreux and the Spanish and multinational training effort centres on Zaragoza, while on exercises the aircraft is increasingly seen putting down on forward and semi-prepared airstrips — the very rough-field tactical work its turboprops and swept propellers were designed to make possible.

Related aircraft

AircraftIQ — the aircraft field guide: 4,893 recognition guides, live overhead identification, works offline.