1:72 SdKfz. 234/6 Leichter Funkmess-/Flak-Kommandowagen 'Medusa'; vehicle '327' of an unidentified unit (probably a Panzer-Fla-Zug of the Pz.Div. 45, 'Panzer Division Clausewitz'); Braunschweig region, early 1946 (What-if/modified Hasegawa kit)

+++ DISCLAIMER +++

Nothing you see here is real, even though the conversion or the presented background story might be based on historical facts. BEWARE!

 

 

Some background:

Armored wheeled vehicles were developed early in Germany, since they were not subject to the restrictions of the Versailles Treaty. The Sd.Kfz. 234 (Sonderkraftfahrzeug 234, or Special Purpose Vehicle 234) belonged to the ARK series (the type designation of the chassis) and was the successor to the earlier, eight-wheeled Sd.Kfz. 231/232/233 family. The Sd.Kfz. 234 incorporated several innovative features, including a monocoque chassis with eight wheels, and an air-cooled Tatra 103 diesel engine for use in North Africa. The latter gave the vehicle an extraordinary range of more than 600 miles (1.000 km). The vehicle had eight-wheel steering and drive and was able to quickly change direction thanks to a second, rear-facing, driver's seat. Chassis were built by Büssing-NAG in Leipzig-Wahren, while armoured bodies were provided by Deutsche Edelstahlwerke of Krefeld and turrets by Daimler Benz in Berlin-Marienfelde and Schichau of Elbing, with engines from Ringhoffer-Tatra-Werke AG of Nesseldorf.

 

The first and possibly best known version to reach frontline service was the Sd.Kfz. 234/2 ‘Puma’. It had a horseshoe-shaped turret armed with a 5cm L/60 gun, which was originally intended for the VK 1602 Leopard light tank. Even though it was a reconnaissance vehicle, the armament made it possible to take on lighter armored vehicles, and it was produced from late 1943 to mid-1944. This variant was replaced in production by the second version, the Sd.Kfz. 234/1, which had a simpler open turret (Hängelafette 38) armed only with a light 2 cm KwK 38 gun; it was manufactured from mid-1944 to early 1945.

The SdKfz 234/3, produced simultaneously with the 234/1, served as a support for the reconnaissance vehicles with more firepower. It had an open-topped superstructure, in which a short-barreled 7.5cm K51 L/24 gun was installed. This gun was intended primarily for use against soft targets, but when using a hollow charge shell, the penetration power exceeded that of the 5cm L/60 gun. This variant was produced from mid-1944 to the end of 1944, before switching production to the 234/4 and other variants. The Sd.Kfz. 234/4 replaced the L/24 gun with the 7.5cm L/46 PaK 40. This was yet another attempt to increase the mobility of this anti-tank gun; however, with this weapon the 234 chassis had been stretched to its limits, and it only carried limited ammunition (twelve rounds) due to lack of storage space. This variant was manufactured from the end of 1944 on in limited numbers.

 

Another interesting use of the chassis was the Sd.Kfz 234/6. When, towards late 1945, the Einheitschassis for the German combat tanks (the ‘E’; series) reached the front lines, several heavily armed anti-aircraft turrets had been developed, including the 30mm Kugelblitz, based on the outdated Panzer IV, the ‘Coelian’ turret with a twin 37mm cannon (mounted on the Panzer V Panther hull), but also twin 55 and even 88mm cannons on the new E-50, E-75 and E-100 chassis'. With alle these new vehicles and weapons, firepower was considerably increased, but the tank crews still had to rely on traditional visual tracking and aiming of targets. One potential solution for this flaw, in which the German Heeresleitung was highly interested from the start, was the use of the Luftwaffe’s radar technology for early target identification and as an aiming aid in poor weather conditions or at night. The German Luftwaffe first introduced an airborne interception radar in 1942, but these systems were still bulky and relied upon large bipolar antenna arrays. Esp. the latter were not suitable for any use in a ground vehicle, lest to say in a tank that could also carry weapons and ammunition as an independent mobile weapon system.

 

A potential solution at least for the mobility issue appeared in late 1944 with the development of the FuG 240 ‘Berlin’, a new airborne interception radar. It was the first German radar to be based on the cavity magnetron, which eliminated the need for the large multiple dipole-based antenna arrays seen on earlier radars, thereby greatly increasing the performance of the night fighters which carried the system. The FuG 240 was introduced by Telefunken in April 1945, primarily in Junkers Ju 88G-6 night-fighters, behind a streamlined plywood radome in the aircrafts’ nose. This so greatly reduced drag compared to the late-model Lichtensteins and Neptun radars that the fighters regained their pre-radar speeds, making them much more effective esp. against heavy and high-flying Allied bombers. The FuG 240 was effective against bomber-sized targets at distances of up to 9 kilometers, or down to 0.5 kilometer, which, as a side benefit, eliminated the need for a second, short-range radar system.

 

Right before the FuG 240's roll-out with the Luftwaffe the Heer insisted on a ground-based derivative for its anti-aircraft units. The Luftwaffe reacted very reluctantly, but heavy political pressure from Berlin convinced the RLM to share the new technology. Consequently, Telefunken was ushered to adapt the radar system to armored ground vehicles in February 1945.

It soon became clear that the FuG 240 had several drawbacks and was not perfectly suited for this task. Ground clutter and the natural horizon greatly limited the system's range, even though its 9 km range made high-altitude surveillance possible. Furthermore, the whole system, together with its power supply and the dirigible dish antenna, took up a lot of space. Its integration into an autonomous, tank-based anti-aircraft vehicle was still out of reach. The solution eventually came as a technical and tactical compromise: armed anti-aircraft tanks were to be grouped together in so-called Panzer-Fla-Züge, with an additional radar surveillance and guidance unit, so that the radar could guide the tank crews towards incoming targets, which would still rely on individual visual targeting.

 

The first of these dedicated guidance vehicles became the ‘Funkmess-/Flak-Kommandowagen Sd.KfZ 234/6’, which retained its secondary reconnaissance role. Together with Telefunken, Daimler Benz developed a new turret with a maximum armor of 30mm and a commander's cupola that would hold most of the radar equipment. This was christened ’Medusa’, after the monster from Greek mythology with snake hair and a petrifying sight, and during the system’s development phase, the radar's name was adopted for the whole vehicle, even though it never was official.

The turret held a crew of two, while the Sd. Kfz 234 chassis remained basically unchanged. Despite the cramped turret and the extra equipment, the Sd.Kfz. 234/6 was not heavier than its earlier brethren, because it remained unarmed, just a manually-operated FlaMG on the turret roof was available for self-defense. A heavier armament was not deemed necessary since the vehicle would either stay close to the heavily armed tanks it typically accompanied, or it would undertake lone reconnaissance missions where it would rely on its high speed and mobility. The vehicle's crew consisted of four: a driver in the front seat, a commander and a radar operator in the turret and a radio operator/second driver in the hull behind the turret, facing rearwards.

 

The Medusa antenna array was installed at the turret's front. The dish antenna, hidden under a hard vinyl cover, had a diameter of 70cm (27 1/2 inches), and it was directly adapted from the airborne FuG 240. Power output was 15kW, with a search angle of +80/− 5° and a frequency range: 3,250–3,330MHz (~10 cm). Range was, like the airborne variant, 0.5–9.0 kilometer. Power came from a separate generator directly attached to the vehicle’s Tatra diesel engine, hidden under an armored fairing on the bonnet that partly obscured the rear driver's field of view.

Beyond the radar system, the vehicle was furthermore equipped with a visual coincidence range finder, installed right through the turret. The system worked as follows: Light from the target entered the range finder through two windows located at either end of the instrument. At either side, the incident beam was reflected to the center of the optical bar by a pentaprism, and this optical bar was ideally made from a material with a low coefficient of thermal expansion so that optical path lengths would not change significantly with temperature. The reflected beam first passed through an objective lens and was then merged with the beam of the opposing side with an ocular prism sub-assembly to form two images of the target which were viewed by the observer through the eyepiece. Since either beam entered the instrument at a slightly different angle the resulting image, if unaltered, would appear blurry. Therefore, in one arm of the instrument, a compensator was integrated which could be adjusted by the operator to tilt the beam until the two images matched. At this point, the images were said to be in coincidence. The degree of rotation of the compensator determined the range to the target by simple triangulation, allowing the calculation of the distance to the observed object.

 

The optical bar had a span of 230 cm (90.75 in) and went right through the turret, just above the radar device installation. For the most effective range it even protruded from the turret on both sides like pylons, an arrangement that quickly earned the vehicle several nicknames like ‘Hirsch’, ‘Zwoender’ (a young stag with just two antlers) or ‘Ameise’ (ant). Fixed target reading with the rangefinder was effective on targets from 2,700 to 14,500 yards. Aerial courses could be recorded at all levels of flight and at a slant range between 4,000 and 12,000 yards - enough for visual identification beyond the group's effective gun ranges and perfectly suitable for long range observation.

 

The first Sd.Kfz. 234/6s reached, together with the first new FlaK tanks, the front units in summer 1945. Operating independently, they were primarily allocated to the defense of important production sites and of the city of Berlin, and they supported tank divisions through visual reconnaissance and general early warning duties. In due course they were supported and partly replaced by the bigger and more capable ‘Basilisk’ system, which had, due to the sheer bulk of the equipment, to be mounted on a tank chassis (initially on the Panzer V ‘Panther’ as the Sd.Kfz. 282/1 and from early 1946 onwards on the basis of the new Einheitspanzer E-50 hull as the Sd.Kfz. 282)

 

Operationally, the Sd. Kfz 234/6 was surprisingly successful, even though the radar remained capricious, its performance very limited and the unarmored equipment at the turret’s front was easily damaged in combat, even by light firearms. But the Sd.Kfz 234/6 offered, when the vehicle was placed in a location with a relatively free field of view (e. g. on a wide forest clearance or in an open field), a sufficient early warning performance against incoming bombers at medium to high altitudes, esp. when the general direction of incoming aircraft was already known.

The radar system even allowed a quick alert against low-flying aircraft, esp. when operating from higher ground. The radar information reduced the anti-aircraft tank/gun crews' reaction time considerably and allowed them to be prepared for incoming targets at the right altitude, direction and time. Hit probability was appreciably improved since quick passes of aircraft could be pre-determined.

 

Until the end of hostilities, probably fifty Sd.Kfz 234/6 were built new or converted from existing 8x8 chassis. Beyond this, the relatively light ‘Medusa’ device was furthermore mounted on outdated tracked armored vehicles like the Panzer III and IV, of which another forty vehicles were produced as Funkmess-/Flak-Kommandowagen III and IV.

 

 

Specifications:

Crew: Four (commander, radar operator, driver, radio operator/2nd driver)

Weight: 11,500 kg (25,330 lb)

Length: 6.02 m (19 ft 9 in)

Width: 2.36 m (7 ft 9 in)

Height: 2.84 meters (9 ft 4 in) w/o AA machine gun

Suspension: Wheeled (Tires: 270–20, bulletproof), with leaf springs

Track width: 1.95 m (6 ft 4 1/2 in)

Wading depth: 1.2 m (3 ft 11 in)

Trench crossing capability: 2m (6 ft 6 1/2 in)

Ground clearance: 350 mm (13 3/4 in)

Climbing capability: 30°

Fuel capacity: 360 l

Fuel consumption: 40 l/100 km on roads, 60 l/100 km off-road

 

Armor:

9-30 mm (.35-1.18 in)

 

Performance:

Maximum road speed: 80 km/h (49 mph)

Operational range: 950 km (590 mi)

Power/weight: 19 PS/t

 

Engine:

Air-cooled 14,825 cc (905³ in) Tatra 103 V12 diesel engine,

with 157 kW (220 hp) output at 2.200 RPM

 

Transmission:

Büssing-NAG "GS" with 3 forward and reverse gears, eight-wheel drive

 

Armament:

1× anti aircraft 7.92 mm Maschinengewehr 42 with 2.800 rounds

 

 

The kit and its assembly:

This whiffy and almost Ma.K-looking vehicle was inspired by the late WWII anti-aircraft tanks that never made it into hardware. I wondered how the gap between the simple visual aiming and the next logical step to surveillance and tracking radars could have been achieved, and the German airborne radars were a suitable place to start.

 

The idea of a dedicated vehicle was a logical step, since it would take many more years to develop a system that would be compact enough to be carried together with effective armament in just a single vehicle. It would take until the Sixties that such stand-alone systems like the Soviet ZSU-23-4 (1965) or the AMX-13 DCA (1969) would be produced.

 

I chose the light Sd.Kfz. 234 as basis because I do not think that a full armored tank would be devoted to a limited radar operation role, and instead of relying on heavy armor I deemed a light but fast vehicle (just like many other later AA tanks) to be the more plausible solution.

 

Basically, this is an OOB Hasegawa Sd.Kfz. 234/3, the “Stummel” with the short 7.5cm gun and an open hull. The latter was closed with 1mm styrene sheet and a mount for a turret added.

The turret itself is based on an Italeri Matilda Mk. II turret, but with a highly modified front that holds a resin ‘Cyrano’ radar (actually for an 1:72 Mirage F.1C) on a movable axis, an added rear extension and the antler fairings for the visual coincidence range finder. As a side note, similar systems were to be integrated into German late WWII combat tanks (e. g. in the Schmalturm), too, so this is another plausible piece of technology.

 

A German tank commander figure (from a vintage ESCI kit) populates the open hatch of the commander's cupola, the AA machine gun with its mount is an addition from the scrap box.

On the hull, the only modification is the additional generator fairing above the engine, for a slightly modified silhouette.

 

 

Painting and markings:

The turret looks weird enough, so I wanted a simple, yet typically late-WWII-German camouflage. I settled upon a geometric variation of the Hinterhalt three-tone scheme, primarily with dark yellow and olive green fields and stripe and a few red brown additions - inspired by a real late war Panther tank.

 

The basic color is RAL 7028 (modern variant, though), applied from the rattle can on the semi-finished hull and turret as a primer. On top of that, the shapes were added with acrylic dark grey-green (RAL 7009, Revell 67) and red brown (Humbrol 180) with a brush. The less bright colors were chosen on purpose for a low contrast finish, and the edgy shapes add a slightly SF-ish look.

 

A black ink wash and some dry-brushing along the many edges were used to weather the model and emphasize details. After decals had been applied, the kit was sealed with matt acrylic varnish and some artist pigments were added around the wheels and lower hull in order to simulate dust and dirt. On the lower chassis, some pigments were also cluttered onto small patches of the acrylic varnish, so that the stuff soaks it up, builds volume and becomes solid - the perfect simulation of dry mud crusts.

 

 

A whiffy tank kit with a long background story - but the concept offers a lot of material to create a detailed story and description. And while the vehicle is a fantasy creation, it bears a weird plausibility. Should be a nice scenic addition to a (whiffy, too) German E-75 Flak tank (to be built some day)?

 

Done