Latécoère 28

Design and development

The Latécoère 28 was a development of the Latécoère 26. It was braced high-wing single-engined monoplane initially powered by Renault 12Jbr engine. The Latécoère 28 had a fixed tailwheel undercarriage and enclosed cockpit for two crew. The cabin was fitted for eight-passengers with access to a washroom.

A total of about fifty planes of several versions were built between 1927 and 1932. The seaplane version, the Latécoère 28-3, was the first to make a postal delivery crossing of the South Atlantic when Jean Mermoz flew from Dakar to Natal in 21 hours and a half aboard the Comte-de-La Vaulx (prototype n° 919) on 12 May 1930. [1] Unfortunately the plane was lost at sea during the return flight (with no loss of life, nor of mail).

This high-wing single engine plane was first built with Renault engines which were soon replaced by Hispano Suiza 12Lbr giving 500 hp (370 kW). The floatplane version had the Hispano Suiza 12Lbr giving 650 hp (480 kW).

Operational service

The first aircraft were used by Aéropostale on the African mail routes connecting Casablanca and Dakar. The aircraft also inaugurated a Paris-Madrid service. It became famous in South America because of the regular mail service it ensured, from France to Argentina, and further on. With this plane it was possible to send a letter from Paris to Santiago de Chile in what seemed then like an astonishingly short four days. Previously, the mail steamships had taken weeks or months.

It had a very limited military career. Venezuela bought three for use as bombers, and the government of France gave several to the republican side in the Spanish Civil War.

Variants

Laté 28.0

Initial production with a 500 hp (372.85 kW) Renault 12Jbr engine, 17 built (some later converted to 28.1).

Laté 28.1

Further production with a 500 hp (372.85 kW) Hispano-Suiza 12Hbxr engine, 29 built.

Laté 28.2

Mail carrier, one built (n°948).

Laté 28.3

Mail carrier float-plane, five built. Three entered service with Air-France under the erroneous designation Latécoère 28.1/H

Laté 28.3/H

A wheeled landing gear version of the 28.3, one built.

Laté 28.3-I

A passenger version of the 28.3, powered by a 700 hp (521.99 kW) Gnome et Rhône 14Kb Mistral Major radial engine, one built.

Laté 28.4-I

A development of the 28.3 with a 650 hp (484.70 kW) Hispano-Suiza 12Nbr engine, one built

Laté 28.5

Structurally strengthen version with a 650 hp (484.70 kW) Hispano-Suiza 12Nbr engine.

Laté 28.6

For Venezuela powered by a 650 hp (484.70 kW) Hispano-Suiza 12Nbr engine, three built.

Laté 28.8

One 28.0 modified with an enlarged wingspan

Laté 28.9

Three-seat landplane bomber for Venezuela, three built.

Civil

 Argentina

Aeropostala Argentina

 France

Aéropostale

Air France

 Venezuela

Aviacon Aeropostal Venezolana

Linea Aeropostal Venezolana

Military

 Spanish Republic

Spanish Republican Air Force

 Venezuela

Venezuelan Air Force

Specifications (Latécoère 28.0)

Data from Latécoère

General characteristics

Crew: 2

Capacity: Payload 925kg (2,039lb) or 8 passengers

Length: 13.625 m (44 ft 8 in)

Wingspan: 19.25 m (63 ft 2 in)

Height: 3.58 m (11 ft 9 in)

Wing area: 48.6 m² (523 sq ft)

Empty weight: 2,166 kg (4,775 lb)

Gross weight: 3,856 kg (8,501 lb)

Powerplant: 1 × Renault 12Jb V-12 liquid-cooled piston engine, 373 kW (500 hp)

Performance

Maximum speed: 222 km/h (138 mph; 120 kn) at sea level

Cruise speed: 200 km/h (124 mph; 108 kn)

Range: 4,685 km (2,911 mi; 2,530 nmi)

Service ceiling: 5,200 m (17,100 ft)

Rate of climb: 2.04 m/s (402 ft/min)

Time to altitude: 4,000m in 59min 38s