jan brilman píše:Hi,
This or the next week, I hope to receive the kit for the 2600 mm Blanik.
The 2600 version is he same as the 2100, just bigger.
So I've studied the foto's for the assembly of the smaller one and I have some (four) questions.
I hope you are willing to share your knowledge and experience.
Dear Jan
I have not built Blanik but let me try to provide some info base on manufacutreres side.
Question 1.
What is the way to determine the depth and slope of the trenches in the wings?
A: You have got the answer from Igor B already, let me just add that you shall look at the ribs in the kit whether these have pre-cut holes for the wing joiner. That would determine the depth from one side (the root) Also please note that there are two trenches according to the drawing on the manufacturers site - one parallel to the leading edge which is for the longeron and adjacent one perpendicular to the root rib for the the wing joiner tube. The towhe shall be connected. Please see the link in response to Q2 below.
Question 2.
Are these carbon reinforcements?
Standing upright?
The drawing on the manufacurers site
http://stahuj.lm-model.cz/Navody%20%28v ... avod_2.pdfforesees either carbon or alu spar, likely standing upright but you may consider also a carbon tube for extra torsional rigidity. Perhaps spruce would do as well. The wing joiner shall be the 5 mm steel. You need to configure the connection between the joiner wing tube and the longeron. You will see if the supplied kit contains any of these.
Just cut a notch with a knife and glue them in?
It is an option but using hot wire is easier
Question 3.
Dihedral in the stabiliser: a matter of choice?
A: This is a semi scale model. The original full size plane stablizer had a 5degrees dihedral. So if you wish to get the semi scale appearance then the dihedral would be logical. Please see attached link with data on the plane and 3D drawing.
https://hao.cz/letadla/klubova/blanik.html Question 4.
What is happening here? EPP is first being cut out, and then glued in again?
I hope someone can help me (I also mailed Libor).
If you manage to cut it out in shape you can definitely use it to fill in the remaining spar once you glue in the longerons and wing tubes. And then cut out the excess. The other way is to use just PU glue/foam which expands as already described.
Finally a point re the PU glue.
Purex is sort of localy distiruted brand and as already described above is yelow to brown. Over time as it ages it becomes darker and darker. Most of the PU glues will be similar e.g. BISON PU MAX but there are some which are transparent to white. E.g.
- Henkel Ponal Construct Pur Leim
- Soudal 60A.
The only drawback is that these are not available in small size at least not here. It may be different in Netherlands.
Perhaps you would not care about the glue colour if you plan to spray or iron the model in silver (Alu) which is the most common color for the original plane. But some were painted to light tones - up to your taste.
Good luck and enjoy...