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1:32nd scale Junkers J.1


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Hi all,
My build of the RAF BE2c is complete, apart from its display case.
So I thought I'd take a break from resin models and rigging.
Therefore the next model will be the Junkers J.1 armoured ground attack aircraft.
This particular aircraft is Serial No: 596/18 at Dessau airfield, Germany, in September 1918.

 

Mike

 

header.jpg

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Posted (edited)

Hi all,
Interesting to note that even 'Wingnut Wings' can get it wrong.
The known gap at the upper wing aileron inboard ends.
Also the instruction manual on page 11 shows assembly of the upper wing outer sections.
The kit supplies wing stiffeners (Parts I1 and I6), which are intended to be fitted into the upper wings outer halves before the halves are joined.
However, the instructions on page 11 do not show or mention these stiffeners.

 

Mike

 

EDIT - I was wrong - the stiffeners are for the upper wing centre section (page 8 in the instructions) - not for the outer wing sections.

 

 

 

Edited by sandbagger
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Hi all,
The kit supplied upper wing outer sections have an extension at the wing trailing edges.
This is to represent the cover strip for the leading edges of the ailerons.
However, due to the limitations of moulding, these corrugated cover strips are moulded as straight extensions.
In reality, these cover strips were normally unevenly distorted along their entire length, from slight to heavy distortions.
As they were made from corrugated Duraluminium sheet, my assumption is they were probably distorted by being trodden on by maintenance personnel.

To create these distortions, I used the heat from an electrical soldering iron.
The wing was held of the tip of the soldering iron until the styrene showed signs of softening.
I then eased the styrene into a distortion using the ball end of a paper embossing tool.
Then I just moved along the wing repeating the process.

Now onto the infamous gap between the aileron inboard ends and the upper wing centre section,

Mike

aileronstrip.jpg

 

wrinkles1.jpg

 

wrinkles.jpg

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Hi all,
The upper wing ailerons are supposed to be close to the outboard trailing edges of the centre section.
Once assembled, there is a 2.5 mm gap where the centre section moulding did not include an extension to meet the ends of the ailerons.
Making inserts to fill the gaps is tricky as the wing surfaces are corrugated.
However, the kit sprues have two parts (24 and 25) which are not used and these are corrugated on on side.
I cut two strips with two corrugations to fit the gaps.
These were cemented into the gap on the top surface of the upper wing.
There is not enough of parts 24 and 25 left to use on the underside of the upper wing.
Therefore I cut inserts from 0.5 mm styrene sheet to fill the gaps then added two 0.5 mm wide styrene rods to represent the corrugations.

Mike

ORIGINAL GAP
gap.jpg
UPPER SURFACE INFILL
gap1.jpg
UNDERSIDE INFILL
gap2.jpg

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Hi all,
Although the kit supplied engine (Benz Bz.IV) is of good quality, there are details of the engine not included.
1. Cylinders coolant pipe (left side of engine only).
2. Ignition lead support tube (both sides of the engine).
3. Fuel primers (left side of engine cylinders).
4. Carburettor pre-heating gallery.
5. Carburettor pre-heating pipe.
6. Carburettor pre-heating pipe.
7. Carburettor pre-heating supply pipe.
8. Ignition leads (both sides of the engine).
9. Carburettor control rod.
10. Fuel supply connection (possibly).
11. Bleed pipe (possibly).
12. Valve gear push rods (6 each side of the engine).
13. Oil filter and pipe.

 

eng11.jpg

 

I've made a start by cutting away the pre-moulded and flat coolant pipe across the bottom of the cylinders.
This was replaced by 0.8 mm diameter styrene rod inserts.
Also the ignition leads support tubes were made from flattened 0.6 mm diameter brass tube.

 

engmod2.jpg

 

Next up are the cylinder fuel primers,

 

Mike
 

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17 hours ago, LSP_Mike said:

Nice so far. Also note the valve springs are just wee cylinders. I wrapped wire around to represent the springs.

Hi Mike,

Yes I noticed that.

Also the valve gear supports rods are moulded as one flat.

Tricky to do - we'll see,

 

Mike 

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Hi all,
The engine is as complete as I can get it.
I've added some details:

 

Ignition leads support tubes
Ignition leads
Valve gear push rods
Cylinder fuel primers
Float chamber fuel supply
Magneto spark advance rod
Throttle control rod
Carburettor interconnection rod and levers
Rear engine pipes and tachometer drive.
Coolant pipe through cylinder bases
Coolant supply pipe from water pump.

 

The engine controls will be attached to the fuselage/cockpit later in the build.
Now onto the fuselage,

 

Mike

 

engdone1.jpg

 

engdone2.jpg

 

engdone3.jpg

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