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Fokker pair 2


sandbagger
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Hi all,
The first of the Fokker D.VII pair is completed.
So now I'm starting the second of the models, the 'skeletal' model.
This will be a full view model with 3D printed parts from 'Shapeways'.

The donor engine is from the 'Wingnut Wings' Fokker D.VII (OAW) built with the following replacement 3D printed components:
Created by Bob Monroe ('Flugzeugwerke') and available from ‘Shapeways’.
Mercedes D.III Oil Pump,
Mercedes D.IIIa Cylinders (hollow),
Mercedes D.IIIa Crankcase,
German Aircraft Magneto,
Mercedes Cylinder clamps,
Gun synchro mechanism,

The aircraft structure will be the 3D printed Fokker D.VII structure.
Created by Richard Andrews ('Aviattic') and available from ‘Shapeways’.

Shapeways

There will be other after market parts used.

I thought I'd start with the engine, which had to modify slightly as the internal mountings in the 3D sump and block are too small to accept the kit supplied propeller shaft.
Instead I've made one from brass micro-tube to fit not only the 3D engine but also the 'Proper Plane' Heine propeller.

Mike

shapeeng.jpg

shapeeng3.jpg

shapeeng2.jpg

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I thought for this build I'd try 3D printed parts for the engine as well as the airframe.

Despite 3D printing having come a long way, it still has its limitations.

Close inspection of the parts will show layer lines, which weren't totally filled by the primer and paint coats. You can sand or scrape the surfaces smooth, but that's not really an option on smaller, more complicated parts.

However at this scale they are not that obvious. They do cause semi-gloss or gloss coats to look matte, which I think is due to the 'rougher' surface when compared to styrene or resin parts.

I think 3D printed parts are OK for smaller items and probably for surfaces such as wood, but as yet not good enough for larger smoother surfaces,

 

Mike

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Hi all,
A couple of magnetos each made of four separate 3D printed parts.
The ignition leads support tube made from micro-tube.
The magneto drive modified to fit the 3D engine with a brass rod for the magneto drives.
Also the cylinders are mounted onto the engine block,

Mike

mags2.jpg 

supportrail.jpg

magdrive.jpg 

block.jpg 

 

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Hi all,
The engine has progressed a bit more now with the addition:
The conical valve springs
Crankcase breather pipe
Magneto drive assembly with two 3D printed magnetos
Two air pump to crankcase pipes
Decompression valve.

Still have to add ignition leads, intake manifold with locking rings, water pump, coolant pipes, oil filler pipes, sump oil sight glass.
There's also a couple of other pipes plus engine controls.

Mike

shapeeng8.jpg 

shapeeng9.jpg   

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Hi all,
The 3D printed parts are detailed but as can be seen from the shot below, some are very small.
This is a pair of machine gun synchronization mechanisms, each made up of four separate parts.
The biggest problem is separating them from the base block without damaging them!!

Mike


3dgunsnchro.jpg 

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Hi all,
The end is in sight for this engine build.
I've added the decals, ignition leads, gun synchronization mechanism, oil sight glass, generator and drive, cylinder fuel primers, water pump, intake manifold with locking rings, crankcase breather pipe and additional pipes.
All that's left is to add the engine mounted throttle and spark advance (ignition timing) controls - the remainder of the control runs can't be added until the engine is fitted into the fuselage (with the cockpit),

Mike


close1.jpg

close2.jpg  

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Hi all,
I've added the control linkage to the top of the twin carburettors, which consist two levers, connecting rod and cable pulley.
Also the connected levers on the top of the attached 'speed controllers;.
I also created the frame mounted throttle bell-crank and the two cross bars on the forward fuselage frames, which are missing from the kit parts,

Mike

carbtop.jpg

carblinkage2.jpg

lever.jpg  

leverbar.jpg  

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Hi all,
The kit supplied fuselage side frames married to the 3D printed fuselage.
This required cutting both, as both have a pilots seat frame and only one can be used of course.
As the join between the two could be a weak area, I chose to fit them together using brass micro-tube.
This gives more rigidity to the join of the fuselage and allows the fitting of the pilots seat frame from the kit (part A26),

Mike

fusframe.jpg 

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