Nieuport-Delage NiD 640
# Nieuport-Delage NiD 640

The Nieuport-Delage NiD 640 was a French four-passenger transport monoplane built by Nieuport-Delage.

## Development

The NiD 640 was an all-wood high-wing cantilever monoplane powered by a nose-mounted radial engine. An enclosed cockpit for two-crew forward of the wing and a cabin for four passengers was aft. The NiD 640 was powered by 160 kW (220 hp) Wright J-5C radial engine and was followed by 12 production aircraft designated NiD 641 powered by a 180 kW (240 hp) Lorraine 7M Mizar radial engine. The NiD 640 was converted to an ambulance aircraft and later had a Mizar engine fitted to bring it up to 641 standard. One aircraft was powered by a 175 kW (235 hp) Armstrong Siddeley Lynx Major engine and designated the NiD 642 but it did not find a buyer and was scrapped. Seven NiD 641 aircraft were flown by Société des Transports Aériens Rapides (STAR), a subsidiary of Nieport-Delage, on cargo and passenger services from Paris.

## Variants

### NiD 640

    Prototype with a 160 kW (220 hp) Wright J-5C radial engine, one built later converted to a 641.

### NiD 641

    Production aircraft with a 180 kW (240 hp) Lorraine 7M Mizar radial engine, 12 built.

### NiD 642

    Powered by a 175 kW (235 hp) Armstrong Siddeley Lynx Major engine, one built.

## Operators

### Brazil

* Varig

### France

* Société des Transports Aériens Rapides

## Specifications (NiD 641)

Data from L'Aéronautique, July 1928, Jane's all the World's Aircraft 1928

General characteristics

* Crew: Two
* Capacity: Four passengers / mail / 700 kg (1,500 lb) disposable load
* Length: 9.45 m (31 ft 0 in)
* Wingspan: 15.40 m (50 ft 6 in)
* Height: 3.19 m (10 ft 6 in)
* Wing area: 30.9 $m^2$ (333 sq ft)
* Empty weight: 1,050 kg (2,315 lb)
* Gross weight: 1,750 kg (3,858 lb)
* Powerplant: 1 × Lorraine 7M Mizar 7-cylinder radial, 170 kW (230 hp)

Performance

* Maximum speed: 205 km/h (127 mph, 111 kn) at ground level
* Service ceiling: 5,500 m (18,000 ft) absolute
* Time to altitude: 1,000 m (3,300 ft) in 5 minutes 30 seconds; 2,000 m (6,600 ft) in 12 minutes 30 seconds
* Wing loading: 56.6 $kg/m^2$ (11.6 lb/sq ft)
* Power/mass: 0.099 kW/kg (0.06 hp/lb)
* Landing speed: 88 km/h (55 mph)
