Messerschmitt Me 321 Gigant

Messerschmitt Me 321 Gigant

Company type	Military cargo glider
Industry	Aviation
Founded	1941
Headquarters	Germany
Products	Cargo glider

Template:Infobox aircraft

The Messerschmitt Me 321 Gigant was a massive German cargo glider utilized during World War II. Designed to facilitate large-scale invasion efforts, the Me 321 saw limited operational deployment due to a scarcity of appropriate towing aircraft, its susceptibility to enemy attacks during flight, and challenges in ground maneuvering both at departure and landing zones. Over time, the Me 321 evolved into the six-engine Me 323 Gigant, which addressed some of the ground handling difficulties but at the cost of reduced payload capacity. Despite these improvements, all variants remained highly exposed to ground-based fire and aerial assaults throughout their service.

Development

In the lead-up to a potential invasion of Britain during World War II (known as Operation Sea Lion), the Luftwaffe’s Transport Command identified a clear requirement for a cargo and troop transport aircraft with greater capacity than the existing Junkers Ju 52.

Following the cancellation of Operation Sea Lion in December 1940 and the shift in focus towards invading the USSR (Operation Barbarossa), gliders emerged as the most economical transport solution. Consequently, the Luftwaffe’s Technical Bureau issued a tender calling for rapid development of a Grossraumlastensegler ("large-capacity transport glider") to both Junkers and Messerschmitt. The specifications demanded that the glider be capable of transporting either an 88 mm gun with its tractor or a medium tank. This initiative was designated Projekt Warschau (Project Warsaw), with Junkers assigned Warschau-Ost and Messerschmitt Warschau-Süd as internal codenames.

Junkers’ submission, the Ju 322 Mammut, was ultimately unsuccessful due to its all-wood construction approach. As a result, Messerschmitt’s design secured the contract. Initially assigned the RLM designation Me 263, this number was later reassigned to a second-generation rocket fighter developed in 1945 (Messerschmitt Me 263), after being freed when this transport glider’s designation changed to Me 321.

Design

The Me 263 featured a steel tube framework produced by the Mannesmann firm, complemented by wooden spars and a fabric covering treated with doping. This construction method enabled rapid assembly and straightforward repairs while reducing overall weight. The aircraft was later redesignated as the Me 321 and earned the nickname Gigant (Giant) because of its enormous dimensions.

Its nose section measured more than 6 m (20 ft) in height and consisted of two clamshell doors that could only be opened from inside the aircraft, facilitating vehicle loading and unloading via ramps. Compared to the Ju 52, the Me 321 provided a cargo compartment six times larger. The hold extended 11 m (36 ft) in length, 3 m (10 ft) in width, and 3.4 m (11 ft) in height, capable of carrying a maximum payload of 23 t (23 long tons). The cargo bay was designed to mirror the dimensions of a typical German railway flatcar, allowing any rail-transportable goods to fit seamlessly inside the Me 321. Additionally, when configured for troop transport, it could carry up to 200 fully equipped soldiers.

The Me 321 utilized a jettisonable undercarriage consisting of two main wheels from the Bf 109 at the front and two main wheels from the Junkers Ju 90 at the rear, with landing intended on four extendable skids.

The prototype Me 321 V1 completed its maiden flight on 25 February 1941, being towed aloft by a Junkers Ju 90. Test pilot Karl Baur flew this initial flight while carrying 3 tonnes (3 tons) of ballast. Baur noted that control forces were heavy and response sluggish. Consequently, the cockpit was enlarged to accommodate both a co-pilot and radio operator, with dual controls installed. Electric servo motors were added to assist in operating the large trailing edge flaps, and subsequent tests led to fitting a braking parachute as well.

Take-off challenges plagued test flights because the towing Junkers Ju 90 lacked sufficient power. As a temporary solution, three Bf 110 heavy fighter aircraft were employed in a 'Troikaschlepp' arrangement, taking off simultaneously in a V formation. This maneuver carried considerable risk, prompting Ernst Udet to request that Ernst Heinkel devise an improved aerial towing system. Heinkel responded by developing the Heinkel He 111Z Zwilling (Twins), which joined two He 111 airframes using a new central wing section equipped with an additional fifth engine. To aid take-offs from unprepared fields, underwing-mounted liquid monopropellant Walter HWK 109-500 Starthilfe rocket-assisted take-off units were also implemented.

Operational history

The initial Me 321 A-1 production model was introduced into service in May 1941 with Grossraumlastensegler 321 based at Leipheim. At first, it was towed by Ju 90 aircraft, but later the He 111Z and the Troikaschlepp configuration—consisting of three Bf 110s—were employed for towing. This triple Zerstörer towing method posed significant risks, especially if one or more booster rockets failed during takeoff. Such an incident occurred in 1941, resulting in a collision between the tow planes and the tragic loss of all 129 individuals aboard the four involved aircraft.Template:DubiousTemplate:Bettersource This accident was the deadliest in aviation history up to that point, a record that stood until the Tachikawa air disaster of 1953 and was only surpassed by the 1960 New York mid-air collision. The subsequent Me 321 B-1 model featured a three-person crew and was equipped with four 7.92 mm (.312 in) MG 15 machine guns for defense.

On the Eastern Front, the Me 321 experienced limited success due to several operational challenges:

• As a glider, it lacked the capability to attempt multiple landing approaches on congested airstrips.
• Its movement on ground surfaces was impossible without specialized towing vehicles.
• Prior to the deployment of the He 111 Zwilling, reliance on the hazardous Troikaschlepp tow method restricted its one-way operational range to merely 400 km (250 mi), which proved inadequate for secure mission zones.

In early 1942, all remaining Me 321 units were pulled from service in Russia as preparations began for Operation Herkules, an intended invasion of Malta. This operation planned to utilize a fleet of gliders towed by He 111Z aircraft; however, it was ultimately abandoned due to insufficient numbers of suitable towing planes.

The Me 321 returned to Russia in 1943 for a proposed mission aimed at relieving the encircled Sixth Army at Stalingrad. Unfortunately, by their arrival near the front, no appropriate airfields were available, leading to their redeployment back to Germany.

Following cancellation of the Stalingrad relief effort, surviving Me 321 gliders were either placed into storage, dismantled, or converted into their powered successor—the Me 323—which featured six 895 kW (1,200 hp) engines and became the largest land-based cargo aircraft during World War II. Another planned operation involving deploying troops onto Sicily using remaining Me 321s was also scrapped due to lack of feasible landing locations.

In total, production reached approximately 200 Me 321 gliders.

Variants

• Me 321A-1: designed for a single pilot; production totaled 100 units
• Me 321 B-1: equipped with a three-member crew including a co-pilot, armed with between two and four 7.92 mm (0.312 in) MG 15 machine guns; also produced in a quantity of 100