Dornier Do X


1st Flight 1929

Crew: 10-14

Capacity: 66-100 passengers

Length: 40.05 m (131 ft 5 in)

Wingspan: 47.8 m (156 ft 10 in)

Lower wingspan: 10 m (32 ft 10 in) (sponsons)

Width: 4.8 m (15 ft 9 in) maximum hull beam

Height: 10.25 m (33 ft 8 in)

Wing area: 486.2 m2 (5,233 sq ft)

Empty weight: 28,000 kg (61,729 lb)

Gross weight: 49,000 kg (108,027 lb)

Fuel capacity: 16,000 l (4,200 US gal; 3,500 imp gal) in 8 tanks in hull and wings + optional 8,600 l (2,300 US gal; 1,900 imp gal)

Oil capacity: 3,600 l (950 US gal; 790 imp gal) in six nacelle tanks with 1,300 l (340 US gal; 290 imp gal) in a hull tank for in-flight replenishment

Powerplant: 12 × Siemens Jupiter 9-cylinder air-cooled radial piston engines, 391 kW (525 hp) each

Propellers: 4-bladed fixed-pitch wooden propellers


Maximum speed: 242 km/h (150 mph, 131 kn)

Cruise speed: 170 km/h (110 mph, 92 kn)

Range: 1,700 km (1,100 mi, 920 nmi)

Service ceiling: 3,200 m (10,500 ft)

Wing loading: 105 kg/m2 (22 lb/sq ft)

Power/mass: 17.2 lb/hp (10.5 kg/kW)


The Dornier Do X was the largest, heaviest, and most powerful flying boat in the world when it was produced by the Dornier company of Germany in 1929.

First conceived by Claude Dornier in 1924, planning started in late 1925 and after over 240,000 work-hours it was completed in June 1929.

Three Do X’s were constructed in total.

The original operated by Dornier, and two other machines based on orders from Italy.

The X2, named Umberto Maddalena (registered I-REDI), and X3, named Alessandro Guidoni (registered I-ABBN).

The Italian variants were slightly larger and used a different powerplant and engine mounts.

Dornier claimed the X2 was the largest aircraft in the world at that time.

Each was powered by Fiat A-22R V12 water-cooled engines, with the six engine mounts being covered by a streamlined fairing.


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