Soyuz 1/25... why not ?

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Happy new year to all RocketryForum members!
And now.. back to Soyuz building.
It is time to put together the pieces. Here the fin assembly

FinSoyuSmall.jpg​

Here the picture of fin alignment tool. I saw this tool in one of the video made by George (Air Command Water Rockets) and immediately I made a copy. It is very easy to build cheap.. and it works perfect!
It is made with aluminum profiles L shape you easily find in the hardware stores.

In the picture it is also well visible the central core tube. As written in previous post the space between external and internal tube is then filled with foam.

Here one of the shroud. You see the centering rings and some reinforcement made with some wood sticks.
The inner surface has also a layer of epoxy to give a better stiffness and avoid that foam pressure makes deformation.
ShroudSoyuSmall.jpg​
 
Here you see the assembly of the first shroud. Rail buttons and boosters holding points are in position too. Centering ring has holes to allow the introduction of the foam.CIMG0556.JPG
 
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Here the full body assembled. Centering rings of Souyz upper stage are assembled. To have an easy transportation and storage, I designed the upper stage with the possibility to be dismounted.
CIMG0566.JPG​
 
With this scale some details that in smaller dimension could be skipped here are a must. If you closely look the surface the panels joins are visible as well othe structural reinforcements.
Soyuz_detail.jpg

To do that I apply the technique of maching thin paper lines attached on the surface.
 
Here you see the boosters at 3 different level of detail finishing
The first has only the lines marked with a pencil, the second has the paper lines attached and the third the small wood details that in the real one are the connection point for various rocket systemsCIMG0628ridotta.jpg
​
Here with a better sharp light the final effect

CIMG0627.JPG
 
Hi After and Ez2! Thanks for supporting :)

Here a bit of discussion for another "new" at least for me solution to manage staging
Here a sketch of the staging and boosters detachment system.Soyuz2Staging.jpg
The holding points of the boosters are the nose cone tip and the step on the fins. Everything kept in position by the stop at the base of the 1st stage.
As wrote before the system works with the principle of Estes staging. But here the mass are different. On a light rocket you can count on interference and friction. Here the boosters weight with engines is in the range of 1Kg. Pure friction holding is difficult to manage and I want avoid mechanical systems. It must be very very simple so... Russian stile!
To do that, I decided to use a magnetic shear pin concept. Nowadays it is quite easy to find small magnets with a strong force on the internet shops. These look like a button and the diameter size is around 5mm.
The nice characteristic is that the force to detach is easy to measure and is absolutely constant.
So I left a minimum interference and I placed 3 couples of them in the interface upper stage and booster.
To be honest the result is very promising. It keep the booster in position and to detach you need 1,2 Kg precisely.
When 1st stage ends the thrust phase a D9-0 light the upper stage. The room between the two stages will get pressurized and will detach the 1st stage and so the boosters are released.
In this case magnetic share pins is a technique quite new for me, so if someone used already magnetic shear pins... please let me know the results.
Here below in green the position of the magnetic pins.

MagClamSy2.jpg​
 
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Here the work continues with nose cone and escape tower. You see that escape tower is made with Bt tubes and nose cone is just the external skin.
This is to allow the fill with the necessary balancing weight. Here is the optimum position to minimize the final total weight of the rocket.I use led shots mixed with epoxy.

NoseConeSyz1.png​


NoseconeSyz.jpg​
 
Here the engine clusters.

CIMG0735.JPG

In this case the pieces will have an aesthetic and technical function.
These work like engines retainer. The central hole is made to place a screw that keeep them in position.

Here a sketch to explain the concept

Syz2engineretainer.jpg
It will easy for them to be burned. Ignition system will have flames that will touch them.So it is good to have easy replacement.
 
Привет, товарищи! Я вижу, что русский здесь не проблема :)
 
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
 
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
 
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
 
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage and pull the nose cone out.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
 
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage and pull the nose cone out.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
 
mbeels said:
Wow, truly incredible. What is the grid fin material? Did you make that as well?
Click to expand...

Hi Mbeels!, the grids are made using some stuff used in ship scale model. Here below a picture shows how it looks when you buy.
These are made with wood, but you find in plastic too.
2544Paiolato.jpg
 
Tom Hoelle said:
I'm really impressed with your level of detail that you're putting into the Soyuz. I've started working on a Vostok and I played with a few options on how to attach the 4 side boosters. I want them to eject from the second stage. At this point I'm planning on using a pair of small brass tubes + wooden pins to keep the bottom of the booster attached with just one set of brass tube + wooden pin mounted to the nose. The idea is the ejection charge will remove the booster from the second stage.

In your Jan 11 post, you mentioned that you used thin paper lines attached on the surface of the boosters. To make sure I understand, you 1) marked lines on the booster to know what to align on and 2) attach the paper lines. What do you use to glue them into place? I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.[/QUOTE
]
Hi Tom! Here below my answers

1) marked lines on the booster to know what to align on and YES CORRECT
2) attach the paper lines. YES CORRECT

What do you use to glue them into place? I use to mix vinilic glue with wallpaper glue. This allows an easy positioning ans has a good strenght.

I was thinking of using 1/100" sheet plastic and scribe the lines which would show thru on the other side. This looks like a better way.
It is a possibility, but I found some negative points about
You should make conical shape panels and apply them on the booster surface. This will add extra weight for something you can do with less that 5g per booster.
I tested plastic...but I don't find so easy to glue.
Then this works for the lines, but for other surface elements no.
Click to expand...
 
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Here the set of pieces , boosters and upper stage is ready for painting.Syzpieces.jpg

Here a detail of the upper stage

syz2upper.jpg
 

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