Thanks! It was a warm Spring day here, so I did the wing work outside. Balsawood dust is very annoying stuff, so it is indeed much more nicer this way.
Firstly, i use a piece of hardwood as the sanding base. It has to have a straight edge, so you can sand the core profile evenly. The core is cut into shape from 1,5 mm balsawood. I make the core 2-3 mm smaller than the actual wing from the trailing edge. So its just plastic to plastic there, resulting in a very sharp edge.
900E54F6-9861-4A5A-8615-3A9C29CFDF74 by
Amiga Hassel, on Flickr
Now they are ready for the glueing. I used two types of sanding paper, attached to a sanding block to achieve a cromatic profile curvature.
02844418-C020-4661-9929-70FFEA3ADACD by
Amiga Hassel, on Flickr
It is important to cut the leading edge open where the corner is rounded. Otherwise the plastic has no way to follow the core cleanly.
A136B1AA-3B5F-438A-8C09-3FA003B2F8BC by
Amiga Hassel, on Flickr
Now the contact glue is spread evenly on the insides of the plastics and the balsa cores. Now it is the time to let it dry for 10-15 mins.
AFC7C880-AB8B-4BE4-83F1-D63223E2AFE6 by
Amiga Hassel, on Flickr
I have several blocks of wood sanded to different profiles. This one is good for this wing profile
CE4BBFE7-B375-4C68-8509-42527C1F20A4 by
Amiga Hassel, on Flickr
I attach the plastic wing surface open to the edge of the block with a piece of masking tape, so it won’t be moving around. It is important to put the top surface with false ribs up! It is too easy to mix the upper and lower side, done that a few times…
B1170DF8-0271-40A7-A51C-12279904A11D by
Amiga Hassel, on Flickr
When the core is properly pressed against the block and has a good contact with the lower surface plastic, it is time to press the topside down and press it in place. From mid wing to the tips, gently but firmly.
02B8EEB2-8812-42DB-8DDB-D48320F68815 by
Amiga Hassel, on Flickr
Here they are! When taken off from the block, press the tips into proper shape and check all the corners. The washout can also be added now to the ailerons if needed. You see that i have a plenty of surplus material around the core. It is a cleaner job this way and also easier to get the tips into right shape.
DF657F30-0014-4F7C-8AA8-82382BA69EDA by
Amiga Hassel, on Flickr
Then i mark the final lines over the drawings for cutting the wings into shape.
4DD55BDA-02B3-4E16-811E-F280B9014BF1 by
Amiga Hassel, on Flickr
Here they are cut, sanded and the scalloping added to the trailing edges with a good Xcto knife…
30D8D613-818C-48F9-A5CC-D3D95589B780 by
Amiga Hassel, on Flickr
I added a coat of primer grey to show you the final shape and surface. I will then cut the ailerons, add hinges and the radiator etc. But that will happen a bit later…. I think i will start the fuselage next week. Btw, you also can see that the Spring has been a bit late here this year and it is rather dry!
8FDF5423-D874-40B1-BDBD-40D6D3AD3DA7 by
Amiga Hassel, on Flickr