German Trailer SdAh 319 - Airforce Trailer for long and heavy loads - WIP

Joined: 11:27 PM - Nov 20, 2002

7:19 PM - Jun 12, 2018 #1

Hello,

This time I would like to share some information on my most current project I have started some months ago.
It is the German trailer SdAH 319, which has been developed in the late stages of war in order to carry heavy and long
loads, especially for the German Luftwaffe. Only few pictures can be found showing that trailer loaded with 
a Fieseler V1, parts of the V2 or the rocket Wasserfall. The most interesting information on that trailer is, that this special design 
used longitudional torsion bars for the rear suspension. Extremely over-engineered according to my understanding.


SdAh 319.jpg

Luckily I was able to obtain information on the general dimensions of that trailer, as well as some pictures of a surviving sample
in the backyard of a German farm. I started with the generation of several scale drawings which have been used in order to have 
clear dimensions of each and every single part.
Folie1.jpg
The next step was scratching all those parts with exception of the wheels (I already had some suitable parts in my box).

After creation of the masters, they have been forwarded in order to make the moulds and castings.

Meanwhile I have received the alpha part set and will begin now to build the alpha model which will be presented step 
by step in this building blog.

Cheers

gert brandl
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Joined: 11:27 PM - Nov 20, 2002

7:37 PM - Jun 13, 2018 #2

Now, the building process for the alpha modell of the German trailer SdAh 319 starts.


Step 1 is the building of the trailer frame including the small profiles inside which should provide sufficient stability for the heavy loads. This building section is the most challenging part of the build, providing a clear and exact base for all other parts. Therefore care has to be taken to get everything aligned.
 

The individual parts 


2018-06-12 23.07.17.jpg

The resulting frame

2018-06-14 11.50.07.jpg
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Joined: 11:27 PM - Nov 20, 2002

6:08 PM - Jun 14, 2018 #3

Now, also the bottom side of the trailer frame has been finished by addition of the small strips which finally result in the u-shaped form of the inner beams.

2018-06-14 12.17.15.jpg
2018-06-14 12.17.36.jpg
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Joined: 11:27 PM - Nov 20, 2002

5:02 PM - Jun 15, 2018 #4

Step 2 is the front axle with wheel arrangement

In the first picture the most relevant individual parts are shown. 2018-06-14 20.50.05.jpg

The parts for the front axle have been assemblied including the long second main beam, which has been engineered in order to provide additional strength and structure.

2018-06-15 18.40.31.jpg

The mounting brackets for the front wheel arrangement as well as the stabilizer arrangement (to prevent from lateral buckling) have been added to the frame arrangement.

2018-06-15 18.40.47.jpg

Now all the parts have been combined.


2018-06-15 18.41.58.jpg
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Joined: 12:01 AM - Apr 28, 2018

11:54 PM - Jun 15, 2018 #5

Gert, looking very nice indeed! If only they knew how hard it is to research then create a simple trailer. It is probably more work than a armoured vehicle as every detail is exposed. I am looking forward to seeing the end result & will be watching with great interest.
  Ron
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Joined: 11:27 PM - Nov 20, 2002

12:29 PM - Jun 16, 2018 #6

Hello Ron,

Thank you very much for your kind words. Also I would like to say thank you for your technical support when realizing this model.

Step 3 now is the towing bar which has been realized only with 5 parts. In the first picture the two at the right side have been already combined.

2018-06-15 18.45.29.jpg
After assembly of the arrangement it has been combined with the front of the wheel section.
2018-06-15 18.57.30.jpg
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Joined: 11:27 PM - Nov 20, 2002

8:40 AM - Jun 17, 2018 #7

Step 4 is the equilibrator or connecting arrangement of the front axle with the torsion bars of the rear axle.

The relevant pieces allowing a fully articulating arrangement are shown below.

2018-06-15 19.41.13.jpg

Fit of the equilibrator has been checked - everything is fine! The torsion bars of the rear axle end in the two mounting brackets. Therefore they will be finally attached in a later stage in order to have them fully aligned regarding their position.

2018-06-16 13.43.50.jpg 2018-06-16 13.40.23.jpg
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Joined: 11:27 PM - Nov 20, 2002

4:21 AM - Jun 18, 2018 #8

Now, step 5 follows by assembly of the torsion bar system. which also is fully functional.

Overview of the parts

2018-06-17 13.37.32.jpg
and after assembly.

2018-06-17 23.45.43.jpg
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Joined: 11:27 PM - Nov 20, 2002

4:23 AM - Jun 19, 2018 #9

Step 6: The overview of parts for the rear axle with wheels which is fully workable.

2018-06-15 19.42.58.jpg

After assembly. The small parts in the center are the mounting brackets for the pipings of the pressurized air of the wheel brakes.

2018-06-17 12.26.54.jpg

Assembly on the trailer.

2018-06-18 06.31.14.jpg
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Joined: 11:27 PM - Nov 20, 2002

4:53 AM - Jun 20, 2018 #10

Step 7. The rear towing device and its mount, whith the small triangular part which locks or releases the pin.

2018-06-16 13.38.28.jpg

The parts after assembly


2018-06-16 14.36.37.jpg


2018-06-18 06.36.28.jpg
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