Arado Ar 232
The Arado Ar 232 Tausendfüßler (German: "Millipede"), was a large two / four engine cargo aircraft.
It featured a box-like fuselage beneath a high wing; a rear loading ramp; a high-mounted twin tail for easy access to the hold; and various features for operating from rough fields. Although the Luftwaffe was interested in replacing or supplementing its fleet of outdated Junkers Ju 52/3m transports, it had a large selection of types in production at the time, and did not purchase large numbers of the Ar 232.(approx 20 were completed)
Designs of the era used a side-mounted door for access, but the Ar 232 used hydraulically powered doors on the rear of the bay with a ramp to allow cargo to be rolled into the hold. The twin tail configuration tail surfaces were mounted on the end of a long boom to keep the area behind the doors clear so trucks could drive right up to the ramp. The high-set tail on its "pod-and-boom" configuration fuselage allowed the Ar 232 to be loaded and unloaded faster than other designs.For short-field operations, the Ar 232 incorporated Arado's own "travelling flap" design for the entire rear surface of the wing. Even loaded to 16,000 kg (35,270 lb), it could take-off in 200 m (656 ft). This distance could be further reduced by using the Starthilfe liquid fuelled rocket assist (RATO) jettisonable propulsion units for take-off.
The most noticeable feature of the Ar 232 was the landing gear. Normal operations from prepared runways used a tricycle gear , but the sideways-retracting main gear's lever-action lower oleo-strut suspended arm – carrying the main gear's wheel/tire unit at the bottoms of the maingears' struts could "break", or kneel, after landing to place the fuselage closer to the ground and thereby reduce the ramp angle. An additional set of eleven smaller, non-retractable twinned wheels per side, mounted along the ventral centreline of the fuselage, supported the aircraft once the main landing gear's lever-action lower arm had "knelt", or could be used for additional support when landing on soft or rough airfields. The aircraft was intended to be capable of taxiing at low speeds on its row of small wheels. The appearance of the row of these wheels led to the nickname "millipede". In flight, the main legs fully retracted inwards into the wings, while the fixed support wheels remained exposed and the nose wheel only semi-retracted.
The aircraft first flew in June 1941 and entered service in 1943,production aircraft were powered by four 1200hp BMW Bramo 323R-2 Fafnir 9-cylinder air-cooled radial piston engines,although the early prototypes had two 1,600 hp BMW 801A/B engines.
Two four-engined prototypes were ordered, the V3 and V4, and V3 first flew in May 1942. A further 10 were then ordered as the Ar 232B-0, and were used widely in an operational role. However, this was the only order for the design. Many of those produced were used by Arado to transport aircraft parts between its factories, and did not see front-line service.
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