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PříspěvekNapsal: ned 29.01.2023 19:08 
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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.


Question 1.

Příloha:
Příloha IMG_0582.jpg je dlouhodobě nedostupná.


Příloha:
IMG_0581.jpg
IMG_0581.jpg
[ 45.14 KiB | Zobrazeno 5385 krát ]



What is the way to determine the depth and slope of the trenches in the wings?


Question 2.

Příloha:
IMG_0581.jpg
IMG_0581.jpg
[ 45.14 KiB | Zobrazeno 5385 krát ]



Are these carbon reinforcements?

Standing upright?

Just cut a notch with a knife and glue them in?


Question 3.

Příloha:
IMG_0643.jpg
IMG_0643.jpg [ 5.67 KiB | Zobrazeno 5385 krát ]


Dihedral in the stabiliser: a matter of choice?


Question 4.

Příloha:
IMG_0681.jpg
IMG_0681.jpg [ 8.82 KiB | Zobrazeno 5385 krát ]


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).

I'm really looking forward to build and fly this beauty!


jan brilman
Netherlands


Přílohy:
IMG_0582.jpg
IMG_0582.jpg
[ 45.97 KiB | Zobrazeno 5385 krát ]

DSCF1445.jpg
DSCF1445.jpg [ 10.66 KiB | Zobrazeno 5385 krát ]
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PříspěvekNapsal: pon 30.01.2023 13:45 
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Hi everyone,

I am a little surprised that no one (after some 225 views) reacted to my questions.

May be the first lines were somewhat poorly worded? :(

I have refrased them.

Anyway, I still hope there wil come some answers.

Thanks!


jan.


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PříspěvekNapsal: pon 30.01.2023 14:37 
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Hi Jan, may be there are too little builders 1/ familiar with that model and at the same time 2/ able to answer english language. YOu cannot change the second problem, but if you post link where you found those pictures, you solve the first problem, so there will be 50% better chance to get good answer 8)


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PříspěvekNapsal: pon 30.01.2023 14:54 
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This is where the models can be found:

http://lm-modelshop.cz/index.php?id_cat ... r=category

And here are the pictures . . .

https://lm-model.rajce.idnes.cz/L-13_stavba/

Thanks!


jan.


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PříspěvekNapsal: pon 30.01.2023 16:29 
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Ich kann das Ganze auch nach Deutsch überzetzen, wenn das hilft . . .


jan.


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PříspěvekNapsal: pon 30.01.2023 16:31 
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OK, I will try, but I never did that model and I do different models another way at all.

So my guess:

A1: I would say the depth and slope of that cutout makes dihedral of the wing. Depth at root should allow to match metal wire to go via root rib, the slope is equal to dihedral.

A2: I do not understand very well, if you mean that gray plate, it is metal ruler for cutting.

A3: I think the stab is straight.

A4: The wire goes to that gray tube, so tube is inserted in the cutout, removed material modified to allow that tube in and then all glued inside back, so that the tube is covered. I would do it different way (glue the tube, glue that pice as it is and after drying cut it to match surface of the wing), but it is matter of choice.


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PříspěvekNapsal: pon 30.01.2023 22:54 
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Hi Igor,


Thanks for your answers.

Answer 1: yes, that makes sense.

Now I have to figure out a way to direct the soldering gun in such a way through the material, so that the correct trench with correct slope results . . .


Answer 2: I got the foto's mixed up.

This is the correct image:

Příloha:
DSCF1446.jpg
DSCF1446.jpg
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What is the proper way to insert carbon into the wing?


Answer 3: I think I've seen LM Blaniks with the so characteristic dihedral in the stabiliser . . .


Answer 4: when you drag the soldering gun through the material, is that piece of material what comes out?

(I still have to buy such a device . . .)

Thanks!


(Still I think there must be some readers who have built this model . . .)


jan.


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PříspěvekNapsal: úte 31.01.2023 11:28 
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Hi, Jan.
Sorry for mistakes in my english text.
I have only Corsair XL from LM Model, but I have Blanik with fiber glass fuselage and hand made polystyrene wings.

So here are my opinions:

Question 1:
- As Igor said, depth and slope depends on wing dihedral. You can cut out EPP some way, glue the wing connection rod tube and then fill the hole with another piece of EPP.
In this case I recommend do it on both wings at the same time (wings are connected with connection rod and fixed in proper angle). Holes in EPP may be inaccurate. But You can use PU glue (polyuretane). It makes foam and inaccuracies are filled nicely. You must be careful: foam expands through EPP slightly, separate parts (and connection rod tube end) by adhesive tape or something. At the end You can finish the wing surface with light putty for plasterboards.

Question 2:
jan brilman píše:
Just cut a notch with a knife and glue them in?

Yes, exactly. The carbon strip is thin.

Question 3:
You can made stabiliser with dihedral (as on real Blaník). Simplest way to do it is glue sabiliser with dihedral and use two servo rods, as You can see in this photo: https://lm-model.rajce.idnes.cz/L-13_stavba/491755006.
It's possible to do it with one servo rod only, but mechanism on stabiliser is more complicated.

Question 4:
This is exactly the procedure described in Question 1. The glue on the photo is polyuretane called "PUREX". Just a little hint: use of the humidifier on glued parts makes more PU foam.


jan brilman píše:
I also mailed Libor

I hope, he will answer. But my experience is, that he reacts very slowly.

_________________
http://semos333.rajce.idnes.cz/


Naposledy upravil semo dne úte 31.01.2023 12:08, celkově upraveno 1

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PříspěvekNapsal: úte 31.01.2023 11:47 
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jan brilman píše:
Answer 4: when you drag the soldering gun through the material, is that piece of material what comes out?

(I still have to buy such a device . . .)


Probably not. I think, this is new piece from "fresh" EPP board.

A little notes to my previous post:
- If You want to use the soldering gun, make custom tip from copper wire with depth stop (additional small bend on wire). It makes Your work much easier.
- To make perfect dihedral angle, underlay the ruller on one side. When sliding soldiering gun tip (with depth stopper) on the ruller, hole will have variable depth too.
- Be carefull, hot wire will burn a few milimeters of EPP on each side. It depends on cutting velocity. Use piece of EPP (or PS) and try it first.

_________________
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Naposledy upravil semo dne úte 31.01.2023 18:04, celkově upraveno 1

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PříspěvekNapsal: úte 31.01.2023 14:59 
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Hi Semo,


Thanks, that's really helpful information! :D


jan.


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PříspěvekNapsal: úte 31.01.2023 18:15 
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That was only common starting informations, the rest is up to you :-). If You don't worked with PU glue yet, use gloves (the glue makes dark stains on hands :-( ). And it's always better to make some experiments on piece of EPP or PS (at least).

I wish you trouble-free building!

_________________
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PříspěvekNapsal: úte 31.01.2023 20:48 
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Citace:
trouble-free building!

???

:lol:

'That'll be the day they sell fur coats in hell . . . '


jan.


Naposledy upravil jan brilman dne úte 31.01.2023 22:53, celkově upraveno 1

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PříspěvekNapsal: úte 31.01.2023 22:49 
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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.pdf
foresees 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...


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PříspěvekNapsal: úte 31.01.2023 23:09 
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Hi Louda,


Thanks for taking the effort!

Together with the information from your fellow modellers, the pieces of the puzzle begin to fall into place. :D

Again, thanks.


jan.


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PříspěvekNapsal: pon 26.06.2023 14:12 
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Blanik is ready.

https://www.modelbouwforum.nl/threads/b ... el.281507/

And has flown.

Look on YouTube for Blanik 2600 van LM Model

On low speeds everything is fine, but when the speed is al little higher she becomes difficult to control: the ailerons become a lot less effective.

Is this due to the low torque rigidity of the wings?

Or too little differential of the ailerons?


jan.


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upload_2023-5-16_12-8-18.png
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