Piston

Potez 4D

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The Potez 4D was a four-cylinder, inverted inline aircraft engine. It was first built shortly before World War II, but did not enter full production until 1949. The cylinders had a bore of 125 mm (4.9 in) and a stroke of 120 mm (4.7 in). Power for different models was in the 100 kW-190 kW (140 hp-260 hp) range.

Variants
4D-01
4D-31
164 kW (220 hp)
4D-33
119 kW (160 hp)
4D-34

Applications:
Morane-Saulnier MS.700 Petrel
S.N.C.A.C. NC-840 Chardonneret
Nord 3202
Nord 3400

Specifications:
Potez 4-D 01
Type: Four-cylinder air-cooled inverted inline engine
Bore: 125 mm (4.92 in)
Stroke: 120 mm (4.72 in)
Displacement: 5.85 L (352 cu.in)
Length: 1,207.5 mm (47.5 in)
Width: 510 mm (20.1 in)
Height: 668.5 mm (26.3 in)
Dry weight: 143 kg (314.6 lb)
Valvetrain: Two valves per cylinder with sodium cooled exhaust valves
Fuel system: One Zenith carburettor
Fuel type: 80 octane minimum
Oil system: Dry sump with one pressure and two scavenge pumps
Cooling system: air-cooled
Power output: 119 kW (160 hp) at 2,520 rpm (take-off), 97 kW (130 hp) at 2,360 rpm (Max cruise)
Compression ratio: 7:1
Specific fuel consumption: 245 gram/hp/hour (take-off)
Power-to-weight ratio: 0.83 kW/kg (0.51 hp/lb) (take-off)

Potez 670 / 671

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Designed to meet a requirement for a three-seat fighter with an endurance of three hours at 90% max speed, the Potez 670 was configurationally similar to the Potez 630 and 631. Flown for the first time on 30 March 1939, the Potez 670 had meanwhile been modified as a two-seat long-range escort fighter and bomber destroyer.

Potez 670

Initially powered by two 700hp Gnome- Rhone 14M radials, it was re-engined after initial flight trials with two 800hp Hispano-Suiza 14AB 12/13 radials, with which it resumed flight tests in July 1939 as the Potez 671.

Potez 671

Several production variants were proposed, but flight trials were incomplete at the time of the French collapse and the sole prototype was destroyed during the German onslaught. At the time, work had begun on an initial batch of 40 Potez 671 C2 fighters.

Potez 670
Engines: 2 x Gnome & Rhone 14M-3, 700 hp
Wingspan: 15.10 m
Wing area: 32.50 sq.m
Length: 10.80 m
Height: 3.27 m
Empty weight: 3120 kg
Maximum take-off weight: 4680 kg
Maximum speed: 460 km / h
Cruising speed: 412 km / h
Practical range: 1800 km
Service ceiling: 10,000 m
Crew: 2
Armament: 2 x 20-mm cannon Hispano-Suiza HS-404 front, 2 x 7.5-mm machine guns MAC 1934, 1 x 20-mm cannon Hispano-Suiza HS-404 rear-firing turret

Potez 671
Engines: 2 x Hispano-Suiza 14AC, 800 hp
Wingspan: 15.10 m / 50 ft 6 in
Wing area: 32.50 sq.m / 349.83 sq ft
Length: 10.80 m / 35 ft 5 in
Height: 3.27 m / 11 ft 9 in
Max take-off weight: 4726 kg / 10419 lb
Empty weight: 3186 kg / 7024 lb
Max. speed: 500 km/h / 311 mph
Cruising speed: 445 km / h
Maximum rate of climb: 876 m / min
Service ceiling: 10,500 m
Range: 2000 km / 1243 miles
Crew: 2
Armament: 2 x 20-mm cannon Hispano-Suiza HS-404 front, 2 x 7.5-mm machine guns MAC 1934, 1 x 20-mm cannon Hispano-Suiza HS-404 rear-firing turret

Potez 670 / 671

Potez 453

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A contender to fulfil the 1933 Marine Nationale requirement for a single-seat float fighter suitable for catapult operation from 10,000-ton cruisers, the Potez 453 was based broadly on the design of the two-seat Potez 452 light observation flying boat. Competing with floatplanes tendered by Bernard (H.52), Loire (210) and Romano (R-90), the Potez 453 flying boat first flew on 24 September 1935. Of mixed construction, it was powered by an 800hp Hispano-Suiza 14Hbs radial engine and was intended to carry an armament of two 7.5mm machine guns. The engine was carried on bracing struts ahead of the wing, the thrust axis passing high above the CG of the flying boat with the result that, in view of the small dimensions of the aircraft, a considerable diving moment was induced at full throttle which could not be easily counteracted. Take-off was, in consequence, difficult and could be effected only by reducing engine power. Further development of the Potez 453 was therefore abandoned.

Max take-off weight: 1937 kg / 4270 lb
Empty weight: 1534 kg / 3382 lb
Wingspan: 11.20 m / 37 ft 9 in
Length: 10.20 m / 33 ft 6 in
Height: 3.45 m / 11 ft 4 in
Wing area: 19.00 sq.m / 204.51 sq ft
Max. speed: 318 km/h / 198 mph
Range: 540 km / 336 miles

Potez 453

Potez 230

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With the absorption of ANF-Mureaux in 1937 as a component of the SNCA du Nord (which also included Potez and retained the appellation for its products), Andre Brunet and his co-designers Lemaitre and Hubert continued the line of lightweight fighter development commenced with the ANF-Mureaux 190. In the autumn of 1938, work on a progressive development, the Potez 230, was begun. While possessing a number of features in common with the earlier fighter (eg, elliptical wings), the new aircraft was of more advanced design. Powered by a 670hp Hispano-Suiza 12Xcrs 12-cylinder liquid-cooled engine and having a proposed armament of one engine-mounted 20mm cannon and four wing-mounted 7.5mm machine guns, the Potez 230 was flown on 30 March 1940. When German forces occupied Villacoublay, the sole prototype of the Potez 230 was seized and transported to Germany for examination of the wing torsion box, which, of integral construction, was the first of its type to have been flown.

Max take-off weight: 1800 kg / 3968 lb
Wingspan: 8.74 m / 29 ft 8 in
Length: 7.57 m / 25 ft 10 in
Height: 2.18 m / 7 ft 2 in
Wing area: 10.97 sq.m / 118.08 sq ft
Max. speed: 560 km/h / 348 mph

Potez 230