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Umlaufmotor

Wingnut Wings WNW Mercedes D.IIIa "The Engine"

39 posts in this topic

When I had finished the WNW Jasta 37 Pfalz D.IIIa "the worn-out old work horse",

I made ​​up my mind on the WNW Hansa Brandenburg W.29.
 

Well, between these two I put in a small WNW OoB model - so my thought.
My choice fell on the WNW Mercedes D.IIIa engine.

Very finely detailed and available as a separate sprue - the best prerequisite for a "quick-build".

Well, I started with it in August 2012 ..................................................and no, I am not finished yet. :unsure:
 The thing developed a life of its own during the construction.
It added up more and more small details :huh:  .

I used the original as a template as far as possible.

First, the intake ports have been revised.

But, see for yourself.

 

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Also the round rear intake was shown on the model.

 

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Servus

Bertl

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The sight glass for the oil level had also to be built scratch.

 

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Before the glass was installed, I have painted dark brown/black the inner edges of the sight glass and the oil-level-hole.

 

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Servus

Bertl

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The oil riser pipe from the oil pan to the crankcase has been forgotten by WNW.
But no matter -- with simple brass rod, a couple of small drills, various small pliers and some patience, this line could be laid.

 

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Servus

Bertl

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The two vent pipe on the right engine side have also been revised.

Not a must, these things are very nicely implemented by WNW - but as I said, the build developed a life of its own. :rolleyes: 

 

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The edge of the cap was something abraded.

 

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The parts of the vent pipe assembled but not fixed and glued.

 

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Servus

Bertl

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One floor up - the row of the cylinders.

The lower cooling water pipe was presented very simple.

The clamps on the upper cooling water pipe are also molded on, on the left side only.

This needs to be changed - so my thought.
However, to replace the lower cast-pipe was real work......................................................................the correct diameter, the right angle when drilling, the horizontal direction of the tube, the low material strength at the edge of the cylinder ........................ :unsure: 

 

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Servus

Bertl

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Thank you, Martin and Sasho!

Further with the valves and valve springs.
I used here for the first time a product of Taurus.
I must say, this parts are excellently processed and cast. ;) 
However, the resin valve springs had to be shortened, so that the rocker arms are not at the wrong angle.
Important! The Mercedes-rocker arms are horizontal when the valve is not actuated.

 

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The motor is shown without installing the exhaust, therefore the exhaust flange bolts were removed.

Remember, that in this case the valve stems will not forget - you can see them with no exhaust on the outlet side.

 

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Servus

Bertl

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We are now on the camshaft housing.
The kit-rocker arms were removed with a fine Resin-saw and replaced by the beautiful parts of Taurus.
These parts were very, VERY! carefully cleaned with sandpaper and steel wool.
Note the position of the valves - open and closed. I used an original engine photo as a template  to display the correct valve-timing.

 

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Servus

Bertl

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Unfortunately, I at one point got a pack of excellent resin bolts in the hand. :rolleyes:

From now on, I started to replace all indicated bolts on the motor against '"right"
screws.
Note the screws used on the original engine - two screws and two nuts on stud bolts per housing part.

 

First the screws..................

 

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........................and now the nuts.

 

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Maybe not 100% in scale, but it looks on the model damn real. :D

 

Servus

Bertl

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Bertl, this is awesome. I don't think I ever saw such incredible attention to detail on one of these Mercedes engines.

 

It's given me real conundrums for my next build. I feel I'm going to have to attempt some of these corrections.

 

Can you tell me how you aligned the cylinders so you could drill the hole for the lower cooling pipe? To get every cylinder in line?

Umlaufmotor likes this

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Hi James,

yes, that was the biggest challenge with the water pipe.

Believe it or not,  I held each cylinder in my Hand when I drilled the "waterpipe-hole".
I've tried using the free mind to achieve the right angle.
The right angle at the start to drill the hole is the secret. If this angle is right, then the rest is (relatively) easy.

 

Servus

Bertl

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On the D.IIIa kit engine two screws and a bracket missing on the oil pan.

Wingnut Wings considering only the D.III engine here.

The casted kit screws were replaced by fine Resin screws.

 

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Servus

Bertl

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Now to the ignition system.

The mounting for the loop of the spring for the ignition timing is made of a thin plastic rod.
The eyelet was bent from wire. It was applied only to one side of the motor, a eyelet.

 

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The two magnetos are detailed a little bit ................

 

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Servus

Bertl

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The drive housing of the camshaft, water pump and ignition has also been revised.
The lack of seam (marked in blue) was attached with thin plastic rod and liquid glue.

All screws were replaced with metal screws or resin screws.

 

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Servus

Bertl

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The two float chamber of the carburetor are also completed.

 

Something Tamiya tape, drilled a few small holes, some scratch-build, a few brass parts and some paint - done.

This is now just about the current construction progress .


And yes I know, I am far away from a "quick-build".............................. -_-

 

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Servus

Bertl

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Here are some recent pictures.
Since yesterday I have been working back a bit on the Mercedes engine.


The water pump is now in place. The smaller brass tube (yellow arrow) leads on the original engine to the grease pump in the cockpit.

 

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The Bolts on the exhaust side are also mounted.

 

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Tamiya tape cut into narrow strips, used to represent the pipe clamps.

 

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The decompression lever is also mounted. This is the kit parts, however some refinishing.

 

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Also note the recess for the strap for the Magneto (yellow arrow / circle).

 

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More "comming soon" ................................. ;) 

 

Servus

Bertl

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Beautiful work Bertl

 

Those resin nuts and bolts are fantastic. I was looking at their website to see if they did wing nuts... alas no, but they do a massive range of nuts and bolts, even castellated ones...  I have a couple of sets of Calibre 35 resin nuts and bolts but they seem to have stopped making them :(

 

Love the work you're doing... most of it would be hidden on a mounted engine, but the valve springs etc will be worth considering on my Roland...

 

Keep it coming :)

 

Matt 

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