Tuesday 5 September 2023

Schwerer Wehrmachtschlepper (Armoured sWS) SBS build and paint log

 

 


This is the 2016 ‘2in1’ Bronco kit #CB35214. It was the last release of a series of sWS variants, that were based on the original Great Wall Hobby mouldings stretching back to 2009.

The detail is sharp, and the armoured cab thickness is nicely rendered to scale. Although there is a small degree of mould offset on a few parts there is no flash and very few pin marks present. It is also nice to see well thought out sprue gate connections, making removal easier to accomplish cleanly.

The all-plastic sandwich design of the front wheels is most welcome as is the addition of plastic options to replace some photoetch parts. Unlike the GWH kits Bronco have included a comprehensively designed engine and although nothing will be seen if the engine hatches remain closed it is a nice feature that many modellers will utilise. The tracks are of the individual link type and although not workable they look to be of good quality. The Bronco kits also include a host of accessories that include Jerry cans and fuel drums.

 


The Schwerer Wehrmachtschlepper (sWS; "Heavy Military Tractor") was a German World War II half-track vehicle used in various roles between 1943 and 1945. The unarmoured models were used as supply vehicles and as tractors to haul artillery. Armoured versions mounted anti-aircraft guns or a 10-barrel rocket launcher (Nebelwerfer). Fewer than a thousand were built before the end of the war, but production continued after the war of an improved model in the Tatra plant in Czechoslovakia.

There are a few restored armoured vehicle images out there, but they do appear to have undergone a restoration and are not always authentically carried out. They are nevertheless a good general source of information.


Most of the original Great Wall Hobby variants released were actual produced vehicles, but no photographic evidence exists that either the armoured searchlight (UHU) or the armoured cargo version was ever built. Also, although images do exist of the 2cm Flakvierling 38 fitted to both armoured and unarmoured sWS's, it was never acknowledged as an official production type. Although there is a period image of a sWS Flak 36 by the time the sWS was in production the 3.7cm Flak 43 was considered the more appropriate weapon.

This kit gives you options to build a supply ammo or armoured cargo version. I decided to build the produced supply ammo version and used the Nuts & Bolts 41: Bussings schwerer Wehrmachtschlepper (sWS) and Variants as a reference guide. This book has a nice feature clearly showing all the design changes from prototype to production series by way of colour coded CAD scale images.


Whilst there are many photographs of the armoured cargo vehicle it does appear GWH used a prototype to base their original mouldings on. Although Bronco added extra features to many of the versions they later released, they did not update any of the main mouldings so many of the production vehicle features  will need to be added.

These include the front bumper bar, the side vision ports; the wooden platform supports, the rear panel components on the chassis, the different front lights and the fuel filler cap.

The prototype bumper bars tapered in at the ends whilst the production series vehicles had simplified straight bars.

The two side vision ports on the kit are identical when in fact the production type drivers port was much larger.



 

The wooden platform supports appear to have changed through production although photographic evidence in this area is thin on the ground. The prototype version had the platform sitting higher than the production series but how the wooden support structure changed in shape is unclear. Clear images of the prototype vehicle support show clear daylight between them, yet all the images of the production vehicles I can make out appear to show a solid horizontal beam from front to back. That could just be a trick of the light so it’s difficult to tell. The supports included in the the kit, although of the prototype design, do thankfully sit at the lower height of the production series.

 

Below is a wooden bodied cargo variant and it clearly shows that a solid wooden support seperates the bed from the chassis rails.

 


The chassis rear panel in the kit is of the prototype design. The production series had a step added to the offside. In addittion only one in four production sWS’s ever received a winch, but even when not fitted the holes in the rear panel still remained.

 

The image below is a wooden bodied sWS but clearly shows the production vehicle rear layout

 

 

The use of both Notek and Bosch headlights are seen in war time images.

The prototype fuel filler cap was simply screwed into the top of the tank and was obviously difficult to fill under the platform bed so an extended ‘S’ shaped funnel extending rearward can be seen on production vehicles.

Very few war time images exist of the interior on the armoured version, so areas of the cab mouldings are still up for discussion. This kit does provide a split bulkhead behind the driver on the sprue but oddly does not call it out for either of the versions in this kit! It is used in their Flak variant kits.

Looking at images of the Flak variants it appears that a section of the cab roof was cut short at the rear to provide clearance for the Flak 43. The roof should end just behind the transverse strengthening bar. The area behind that is covered by a tarpaulin on a frame. I am not 100% sure if all the variants had the shortened roof, but on the Flak gun kits you are instructed to remove the access of the roof moulding. This kit does have witness marks on the underside of the roof and witness marks down the interior walls, however, the instructions in this kit only have you remove the witness marks!

 

Another issue Great Wall Hobby made in this area, and one that Bronco did not remedy, is the mistake of adding folded crew seats against the rear exterior walls of the cab armour. What you are seeing in the image below are not seats but brackets for rifles. The two black areas in the image on either side of the bulkhead are holes to which rifles passed through. It is a mistake in the kit, and is clearly evident that any seat with a backrest inclined forward would not be practical. 

The nuts-and-bolts CAD drawing below clearly shows the issue that the kit manufacturer misinterpreted. It also shows a small inward return to the cab armour at the rear where it meets the load bed. This is not replicated in the kit.
 

 

The kit chassis is a one piece item

 

Front axle and suspension added

 

Sprockets and idlers I will be using

 

Front wheels fixed at full lock

 

Sandwhich design front wheels


 Drivers side vision port (original plastic part)

 

Reworked passenger side vision port reduced in size

No front vision blocks are provide with the kit so you will have to source/make your own if displaying them open

 

Cab floor moulding


 

Production fuel filler cab extension made from stretched sprue

 

Cab floor, cab roof and loadbed test fitted to chassis

    Loadbed assembly


 
Running gear test fitted to chassis and tracks

 


 
 
The kits engineering of the suspension allows for extreme wheel articulation
 
 
The cab bulkhead is included in the kit but strangely not called out. As per the N & B reference diagram I used it and added the cut outs for the small arms storage. The racks were sourced from the parts bin
 
 
 
Bulkhead to cab welding was added with stretched sprue
 

 
 
All the electrical boxes you are instructed to add on the passenger side wall means there is no room for a rifle rack on this side. Rather than re-work this area I decided on a bit of artistic licence and added weld marks where the outside rack had been removed.
 
 
 
Witness marks on the underside of the roof you are instructed to remove on the Flak variant kits.
 
 
  
Loadbed cargo added using resin and plastic accessories. The tarpaulin on both the bed and the cab is made using VMS paper shaper
 






Fully primed in red oxide.
 
 
 

Although I do not intend to beat up the paint finish on the exterior, there will have been prominent areas on the platform and side panels which will likely have seen some significant wear even over a short operating life. For this task, I will employ the ever-dependable hairspray method. 

For this project I will be using MRP paints. These are lacquer based and require thinning and cleaning up with a lacquer thinner and not water. These are excellent paints that can be airbrushed direct from the bottle without the need for thinner if desired. I found for base coats my 0.4mm needle worked fine running between 10-12psi. You do need a few coats to build up the opacity, but what you are rewarded with is a lovely smooth and tough finish. 

There is a little confusion about whether MRP paints are suitable when utilising the hairspray technique. I can categorically state they work absolutely fine. Obviously, this is all dependant on the type and the amount of hairspray used and the type and thickness of any overcoats laid down. There are plenty of tutorials on the subject but personally I have always achieved good results with the Tresamme fine mist cans of hairspray. I often decant and use via an airbrush for smaller areas to be covered. Out of the can a couple of swift passes at arm’s length is all that is required. 

Chipping with MRP Paints

With MRP paints there is no need to protect any undercoat layers with varnish. It is tough enough to remain intact unless you really abuse it with sharp tools.  Tamiya rattle can red oxide primer that I used is also extremely durable.

Chipping can begin as soon as the overcoat layer of paint is touch dry. I have found lukewarm water works better than cold in agitating the hairspray and the surface needs a little time to absorb any moisture. A drop of detergent can help to avoid any water pooling. Whereas even a soft brush or a cocktail stick is enough to scratch the surface on a Tamiya/water mixed overcoat, creating the same effects over this lacquer overcoat takes a little longer. Some modellers have even employed fibreglass pencils to start things off! However, if the ratios of hairspray and paint is in the sweet spot, extremely fine chips and scratches can be made without too much effort. Good results don’t happen overnight, so testing the method on a shelf queen or spare piece of plastic card will pay dividends.

Base coat
 
For this sWS I was happy with just the one red primer layer to chip down to. For the base coat I used MRP-216 dark Yellow-RAL 7028 (variant 2 Ausgabe 1944) It was airbrushed in two fine coats. The paint finish does exibit a satin sheen which will help with any pin washing and will unlikely require any additional varnish coats.
 
Base coat chipping
 
The chips on the exterior were kept light and mainly just to the very edges and areas where wear would likely occur immediately in operational use. The cargo bed however was roughed up far more, with some treadplate panels receiving some serious wear and tear.
 









The front wheels received the same treatment