Arado Ar 68
The Arado Ar 68 was a single-seat biplane fighter developed in the mid-1930s. It was among the first fighters produced when Germany abandoned the restrictions of the Treaty of Versailles and began rearming.
Design and development
Designed to replace the Heinkel He 51, the Ar 68 proved to have admirable handling characteristics on its first flight in early 1934, despite Arado's inability to secure a sufficiently powerful engine for the prototype. Eventually, a Junkers Jumo 210 was installed and the Ar 68 went into production, though not before worries about the unforgiving nature of such a high-performance aircraft almost resulted in the cancellation of the project.
The Ar 68 entered service with the Luftwaffe in 1936 and one of the first units was stationed in East Prussia. Soon, the fighter was sent to fight in the Spanish Civil War, where it was outclassed by the Soviet Polikarpov I-16. Arado responded by upgrading the engine of the Ar 68E, which soon became the Luftwaffe's most widely used fighter in 1937-8, before being replaced by the Messerschmitt Bf 109. The last Ar 68s served as night fighters and fighter-trainers up to the winter of 1939-40.
- Ar 68V1
- Prototype, powered by a 492 kW (660 hp) BMW VI engine. First flight in 1934.
- Ar 68a
- First prototype. 1 x 478 kW (641 hp) BMW VId V-12.
- Ar 68b
- Second prototype. 1 x 455 kW (610 hp) Jumo 210A inverted V-12.
- Ar 68c
- Third prototype. 1 x 455 kW (610 hp) Jumo 210A inverted V-12.
- Ar 68d
- Fourth prototype. 1 x 478 kW (641 hp) BMW VId V-12.
- Ar 68 V4
- The fourth prototype (Ar 68d), redesignated after the RLM(Reichs Luftfahrtministerium) introduced the standardised Versuchs (research) number system.
- Ar 68e
- Fifth prototype. 1 x 507 kW (680 hp) Jumo 210Da inverted V-12.
- Ar 68 V5
- The fifth prototype (Ar 68e), redesignated after the RLM introduced the standardised Versuchs (research) number system.
- Ar 68E
- First type to enter Luftwaffe service, powered by a 455 kW (610 hp) Junkers Jumo 210, at sea level for 5 minutes, 500 kW (671 hp)) at 3,800 m (12,467 ft).
- Ar 68F
- Interim production, powered by a BMW VI 7.3Z; 559 kW (750 hp)) at sea level for 1 minute, 410 kW (550 hp)) at 1,000 m (3,281 ft), awaiting supply of Jumo 210 engines.
- Ar 68G
- Abortive attempt to fit a supercharged 500 kW (671 hp) BMW VI.
- Ar 68H
- Only a single prototype was built, powered by a 634 kW (850 hp)) BMW 132Da 9-cyl. supercharged air-cooled radial. It was also the first Arado fighter to have an enclosed cockpit.
Specifications (Ar 68F)
- Crew: one
- Length: 9.5 m (31 ft 2 in)
- Upper wingspan: 11 m (36 ft 1 in)
- Lower wingspan: 8 m (26 ft 3 in)
- Height: 3.3 m (10 ft 10 in)
- Aspect ratio: 6.1
- Empty weight: 1,600 kg (3,527 lb)
- Gross weight: 2,020 kg (4,453 lb)
- Fuel capacity: main tank:200 l (53 US gal; 44 imp gal); oil tank:27 l (7.1 US gal; 5.9 imp gal)
- Powerplant: 1 × BMW VI V-12 liquid-cooled piston engine, 541 kW (725 hp)
- Propellers: 2-bladed wooden fixed pitch propeller, 3.1 m (10 ft 2 in) diameter
- Maximum speed: 330 km/h (205 mph; 178 kn) at sea level
- Landing Speed: 97 km/h (60 mph; 52 kn)
- Range: 500 km (311 mi; 270 nmi)
- Service ceiling: 7,400 m (24,300 ft)
- Rate of climb: 12.6 m/s (2,480 ft/min)
- Time to altitude: 6,000 m (19,685 ft) in 16 minutes
- Wing loading: 74 kg/m2 (15 lb/sq ft)
- Guns: 2 × 7.92 mm (0.312 in) MG 17 machine guns with 500 r.p.g. (rounds per gun)
- Bombs: Up to 6x 10 kg (22 lb) SC 10 fragmentation bombs
- Related development
- Aircraft of comparable role, configuration and era
- Blériot-SPAD S.510
- Fairey Fantôme
- Fiat CR.32
- Fiat CR.42
- Gloster Gladiator
- Grumman F3F
- Heinkel He 51
- Kawasaki Ki-10
- Related lists
- List of Interwar military aircraft
- List of World War II military aircraft of Germany
- List of military aircraft of Germany
- List of fighter aircraft
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