Author Topic: Fokker DVII Ernst Udet LO!  (Read 3689 times)

Offline DMPopa

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Fokker DVII Ernst Udet LO!
« on: August 20, 2024, 11:08:01 AM »
Next up is a build of the Ernst Udet, Fokker DVII LO!.   The model is a repaint using a Fokker DVII Udet skin from the www.sas1946.com website to go with the Kartanowa Kolekcia Fokker D.VII Udet kit.    There are plenty of other Fokker DVII skins out there but the Udet Fokker is special to me.  Sometime in the early '70s I built a 1/72 Udet model, this being before lozenge decals became available on the open market so the lozenge details were omitted in the built kit.   Now I can do a little better.

Fitters has a Udet kit, but I am not in possession of this kit and perhaps its graphics will make an Udet repaint un-necessary for everyone else.   The Kartanowa kit interior, cockpit parts are good so I will not touch them.

Starting off is a description of the technique utilized to create the repaint.   Skins used in the aircraft combat games pose some unique challenges that need to be addressed to execute the repaint correctly, which arises from what I can surmise is the files have specific characteristics (transparency, Alpha value) that allow shadows and light to appear on the airplane.   What I discovered that if one simply cuts and paste (I use GIMP) and resize the image into the target kit graphic, the copied image if blurry.    As it has been explained by someone who knows computer graphics better than I, the image data becomes damaged and fixing work damage is a complicated endeavor.

The workaround is to cut, copy and paste the skin image into the target graphics, target graphics that have been resized and rotated if needed, eliminating the need to edit and damage the skin graphics.   

How is this done.

Open the skin in its own separate file:



Select and cut a part from the skin:



Open the page from the kit that you want to repaint and paste the copied part into the file and position it over the corresponding part in the kit.



The size is too small.   At this point you want to find out the scale factor between the as pasted part and the part that is fully sized to the kit.

In gimp, when the resize option is used, this dialogue box appears when the selected image is to be resized.   



Copy the numbers 89 and 104.   Now, resize the part to fill the copied into the kit image.



The dialogue box numbers are now 112 and 131.   The average of the ratios of 89/112 and 104/131 is .7943.    This scale factor is the reduction in size that the kit page needs to be so the skin will fill the kit graphics.

Now, create a new image file.   

This dialogue box appears.   



The image size in this case is 554 and 790   These need to be reduced by the scale factor of .7943.  This results in an image size of 440 and 627.



Hit OK in the dialogue box and this appears:



Now copy the entire kit page and paste it into the newly created image file:

You get this. 



Because the image being pasted into the image file is bigger, only part of the page shows.    Now, resize the pasted image to fit inside of the smaller box.



Resize the image



Go back to the skin file and copy and paste the image that you started with and paste it into the file you have just created and resized and move the image to its proper location on the kit page.  Do the same for other parts.  Note in this example that the skin and the kit do not agree 100%, so the width is matched as this is (at least at this point) a more important feature to base the resizing on.  Later on I colored in some red to fill out the image.  The copied image will be properly sized to the kit page and no editing is needed.  It is avoiding editing that allows the copied image to be identical to the image in the skin file.



The various images in the skin file will not all be to the same scale factor so this process will have to be repeated for families of skin images.  For example, in this example the fuselage parts had the same scale factor, the wings had another scale factor and the rudder and horizontal and vertical stabilizers had another.   A word about the wing:   This image had to be turned 90 degrees, this was done by swapping the X and Y scaled coordinate so the image file is landscape mode.

This example did not require any changes in light level, sometimes the image has to be brightened.   In Gimp go to Color, Level and change Clamp the input level at 1.47.


















Offline NinetythirdLiberator

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Re: Fokker DVII Ernst Udet LO!
« Reply #1 on: August 20, 2024, 02:11:56 PM »
NICE tutorial!  This will be fun to watch...Dan

Offline NigelR

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Re: Fokker DVII Ernst Udet LO!
« Reply #2 on: August 20, 2024, 05:53:55 PM »
This looks far too complicated for me! I think I will stick with plastic and paint.......

Amazing work though.

Offline DMPopa

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Re: Fokker DVII Ernst Udet LO!
« Reply #3 on: August 20, 2024, 10:39:29 PM »
Some additional thoughts on creating a repainted paper model.

My best practice is to create a new layer on top of the re-sized paper model page and copy the skin graphic into this new layer.    The opacity of the new layer can be reduced which can help position the new graphics into its proper position in the target paper model page.   When sure that the skin graphics has been scaled properly, it really does not matter where the skin graphics is positioned on the paper model page.    A separate layer makes erasers and other edits to be made to the paper model page, or to capture graphics that the skin graphics covered.  Once all changes are made, in Gimp the top layer can be merged into the lower level.

Save often.   My best practice  is to separately save the layered file copy, the merged file, and any files that had color level changes made.   Add descriptive file name titles.  You never know when you have to circle back.  Or create s special file with just a single feature to be reprinted (to save on ink and paper).   

Offline DMPopa

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Re: Fokker DVII Ernst Udet LO!
« Reply #4 on: August 21, 2024, 07:11:39 AM »
Here are some of the completed repainted model sheets.     I have repainted the top wing with white and red stripes on the bottom and with lozenge camouflage on the bottom.    I have seen pictures of the Udet Fokker DVII both ways.   Do any of the readers of this post have any insight as to which version of the upper wing is the most appropriate for this build?


Offline RAGIII

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Re: Fokker DVII Ernst Udet LO!
« Reply #5 on: August 22, 2024, 05:17:55 AM »
Very nice and thanks for the tutorial on your processes. I don't know if it is too late but there is a photo that shows those white stripes on the upper fuselage did not exist. Either way paper models are truly inspirational, and I look forward to your build.
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline petrov27

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Re: Fokker DVII Ernst Udet LO!
« Reply #6 on: August 22, 2024, 08:48:16 AM »
looks great! As far as the upper wing, and if the stripes were on the underside, I think the thought is that Udet had copied what was on his previous Fokker DrI where the stripes did wrap around to the underside. There is also a really poor quality photo that you can maybe just barely see the stripes do wrap (honestly the pic is so bad I am unsure it is clear enough to say that.)
-Patrick

Offline DMPopa

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Re: Fokker DVII Ernst Udet LO!
« Reply #7 on: August 24, 2024, 11:27:15 AM »
The engine construction is cylinders and cylinder heads/tops cardstock paper per the kit, valve springs are Bead Treasures Miyuki 11/0 Delica Matte Metallic Silver Grey beads, the camshaft is K&S .032 music wire and the valve covers are Evergreen Polystyrene .080X.080 cut into blocks.  All are spray painted gloss black from the rattle can.  The valve covers are glued to the music wire with white glue. 





The diameter of the camshaft is driven by the need to have it fit between the valve springs and .032 diameter is a tight fit.  The kit does not include provisions for valve springs or valve lifters but are added here.   

The top of the valve covers is comprised of velum paper that has indentations made from the bottom to replicate attachment bolts and painted silver from the rattle can.  A camshaft transfer gear is added at the aft end of the engine and is made from rolled paper, also painted silver.  Valve lifters are thin strips of velum paper spray painted light gray primer from the rattle can; light grey to add some color contrast with the silver paint.  The intake manifold is Evergreen .040" diameter polystyrene rod, spray painted gloss black from the rattle can. 

Since the engine below the top is covered, I have not included details in the lower sections of the engine.




Offline RAGIII

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Re: Fokker DVII Ernst Udet LO!
« Reply #8 on: August 24, 2024, 11:38:32 AM »
The springs are a nice added detail and the engine is looking great!
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline DMPopa

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Re: Fokker DVII Ernst Udet LO!
« Reply #9 on: August 28, 2024, 10:31:27 PM »
The structure is initially built per the kit.    The right side is assembled first.



The left side is bulkhead is added and the cockpit is completed.  The instrument panel is printed on photo paper.   A side note is the instrument panel becomes part of the structure as this is a primary lateral structure and its positioned on the left and right side is important as this will set the width of the fuselage at this axial location.  The control stick is fabricated of a coated craft wire of a suitable diameter and stiffness (or lack thereof) and bent to shape and painted.



The structure is printed on thick cardboard, sourced from industrial catalogues with impressive covers.

Per the kit, there are many open spaces in the fuselage structure.



My practice is to fill in these openings and later sand and glaze with Ready Patch.






Looking closely at the engine part of the fuselage assembly it shows that the engine cam gear drive feature at the aft end of the engine had to be removed because the fuselage bulkhead immediately downstream of the engine interfered with this feature.   
« Last Edit: August 28, 2024, 10:36:12 PM by DMPopa »

Offline NigelR

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Re: Fokker DVII Ernst Udet LO!
« Reply #10 on: August 29, 2024, 06:57:35 PM »
Excellent progress. Again, this looks like a lot of work!

Offline NinetythirdLiberator

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Re: Fokker DVII Ernst Udet LO!
« Reply #11 on: August 30, 2024, 04:53:55 AM »
Agree with Nigel.  Herculean work, I'd say.  It'll be worth it!

Dan

Offline DMPopa

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Re: Fokker DVII Ernst Udet LO!
« Reply #12 on: August 31, 2024, 03:31:39 PM »
The fuselage has been smoothed over with MH Ready Patch sanded and primed in light grey from the rattle can.  After some final sanding the fuselage will get a final coat of red primer to best match the final color.





The skins have been test fit to the primed fuselage and it was found that the skins do not completely the surfaces.   This means going back to GIMP to make edits to the repainted graphics to correct this problem and print out another page of fuselage skins.   

Offline NinetythirdLiberator

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Re: Fokker DVII Ernst Udet LO!
« Reply #13 on: September 01, 2024, 02:02:02 AM »
Looking great!

Dan

Offline RAGIII

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Re: Fokker DVII Ernst Udet LO!
« Reply #14 on: September 01, 2024, 11:21:30 PM »
Really coming along nicely. I am always amazed at the great details achieved using paper and other basic materials!
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler