1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Let us all watch your new project progress.
marchecquet
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Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby marchecquet » 15 Jun 2017, 06:23

Eric's mail address is right, Arup, you can contact him. He doesn't answer quickly for he is spending his time flying between France and Malaysia !! :D

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ARUP
Posts: 126
Joined: 12 Apr 2015, 14:21

Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby ARUP » 20 Jun 2017, 03:09

Marc, thanks very much for facilitating communication!
Vince had a .pdf of the graphics which he sent to Nigel W at Flight Line Graphics. The fin had rub on transfers for the smaller sized graphics. All the rest of the graphics were masked and painted. Instructions for dry rub transfers called for a smooth blunt stylus but that just wouldn't work with the fabric covered area of the fin. What I did was to tape the upper edge of the transfer sheet to the fin. I used a 4-40 sized ball end hex driver as a stylus. As each letter or two was rubbed onto the surface of the fabric I had to pull and curl the plastic carrier sheet away. The process was slow and tedious. As the carrier sheet became longer I trimmed excess away with a scissors. Where the graphics rubbed onto the surface the carrier sheet would deform and stretch so keeping the letters aligned was a concern. I had a few letters break up and deform but the second try on the opposite side went much better with experience.
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ARUP
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Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby ARUP » 20 Jun 2017, 03:20

Pull-pull cables were attached to the control surfaces. The cables are adjustable on both ends... I may need it! Servos were installed into the fuselage center section. The one with the red arm drives the outer (elevator) surfaces. The other two servos drive the inner surfaces (ailerons). There will be differential in the ailerons. The action is pretty smooth. I made a plug of the rudder bar end blisters, pulled a styrene mold then pulled parts from this mold. I waxed the mold a few times then sprayed a few coats of PVA release into the mold. Polyester resin and light glass used to make the blisters. They need to be trimmed and installed onto the fuselage. The skid was ripped from a board of Ash. It was shaped and sanded, stained and varnished. Its rear mounting block is laminated from Bass... also stained but not varnished. The block was epoxied to the fuselage. An allowance for flexing of the skid was done by elongating the rear skid mount holes. The skid's rear can move fore and aft a little.
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ARUP
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Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby ARUP » 20 Jun 2017, 03:31

As mentioned earlier, Vince supplied a correctly sized graphics .pdf to Nigel at Flight Line Graphics. Thanks Vince and Nigel! The masks were very nice. These masks are very sensitive to butyrate dope so ~10 very light mist coats were sprayed. There were so many masks that I wasn't able to remove them while the dope was still somewhat 'wet'. I let them dry. The dope on the edges left a sort of 'flash' that was proud of the surface. I used masking tape as a 'sandpaper' to remove the flash. When satisfied multiple layers of clear dope were sprayed with some 800 grit sanding to 'level' the surface somewhat. The '27' was made using home made masks. The white field was sprayed first before any graphics painted in place. There was some 'bleed' under the mask which required touch up using a fine sable brush dipped in thinned dope. As the white dope tended to pick up black the touch up had to be done in multiple applications cleaning the brush between each stroke. Again, tedious but doable!
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ARUP
Posts: 126
Joined: 12 Apr 2015, 14:21

Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby ARUP » 20 Jun 2017, 03:33

Ooops! I left off picture showing a piece of masking tape and how well it removes paint 'flash' edges.
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VinceC
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Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby VinceC » 20 Jun 2017, 10:00

Bl**dy amazing

marchecquet
Posts: 136
Joined: 18 Mar 2015, 19:14

Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby marchecquet » 20 Jun 2017, 15:05

:shock: Good job. Stunning model.

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ARUP
Posts: 126
Joined: 12 Apr 2015, 14:21

Re: 1923 Akalflieg Berlin B3 'Charlotte II' in 1:3 Scale

Postby ARUP » Yesterday, 16:13

Thanks, guys! Charlotte was assembled this morning so ballast needed could be determined. It will weigh shy of 18lbs or 8kg. It has springs to keep the wings on the rods. It only requires 6 bolts (3 for each strut) to hold wings in place. There are details yet to be added but I took a few photos. Enjoy!
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