Soyuz 1/25... why not ?

[PieroAcme]

Lets continue with painting , booster orange section.

Main body detail after grey paint

Somo more work about parachute anchorage

 

[neil_w]

Extremely impressive work. Do you plan on entering this into a scale competition?

 

[PieroAcme]

As you can see there is a baffle at shock cord anchorage base. This will minimize the effect of hot ejection gasses against the parachute.

Here the section.

 

[PieroAcme]

Hi Neil ! Thanks

No I simply enjoy the challenge of doing a scale of this size

 

[PieroAcme]

Extremely impressive work. Do you plan on entering this into a scale competition?

Hi Neil ! Thanks

No I simply enjoy the challenge of doing a scale of this size

 

[Ez2cDave]

 

[Daddyisabar]

Super Cool!

 

[John Kemker]

This is one cool project you've got going! Thanks for sharing with us!

 

[PieroAcme]

View attachment 404337


Hi Ez2! Thanks for the pictures. I did searches in the internet ans some pics I know, but you found some more very intersting especially on the interstage structure .

Thanks!

 

[PieroAcme]

Interstage structure pieces under preparation

 

[Ez2cDave]

This is a DIFFERENT UNIT . . .

 

[PieroAcme]

After all these pictures of the real one
a first look of the painted (.. almost painted..one fin missing) model

 

[Ez2cDave]

That looks AWESOME, "Comrade" . . . LOL !

Here is a little "Mood Music" :



Dave F.

 

[Ez2cDave]

 

[PieroAcme]

...and here a pics in flight of the model predecessor (Soyuz 1/50)

 

[PieroAcme]

A group photo with the 1/50 model

 

[Ez2cDave]

 

[chris m]

I have always liked this rocket . One of these days i will scratch one

 

[wrad]

Looks like you have made some fantastic progress! Are you planning to use the same ignition technique as the 1/50 scale model?

 

[PieroAcme]

Looks like you have made some fantastic progress! Are you planning to use the same ignition technique as the 1/50 scale model?

Ciao Wrad!
Good point.
About ignition I'm thinking to use the Klima system.
I did several launches of my models using that and I have a quite good practices now.
Klima system has some pro and cons. But spyder too.
Klima has like cons that the engine ignition is not 100% symultaneous. The flame is moved along the black power tape so this gives some small differences. The pro is that it is very reliable. So far I had no one single failure.
I saw launches with more that 40 engines and it works well.
You can turn as pro the time difference if you instead want to manage some differences of ignition time for purpose.
Spider has like cons the fact that the system launches a lot of gasses against the engines. This ususally makes a little jump up of the rocket before the engines are at full thrust. This is omething I would like to avoid.
The pro is that the ignition is symultaneous.
I have some doubts about the spider in this case it will have to be quite big. The surface under pressure is large.
The load it has to resist is high. Then the volume of the combustion chamber is significantly large.
This means that the hot gasses will have to push out some cold one before reaching the ejection nozzle.
So in this moment I'm more in favour of the Klima. But I'll do some tests before deciding.
When I did the Soyuz 1/50 the spyder was the only possible solution. I did several ground test to calibrate the powder quantity and once it was ok I built a rocket with a cluster of 5 engines to make the final testing in real conditions.
So I'll do some tests before deciding.

 

[PieroAcme]

Here Soyuz 1/25 with grid fins , interstage structure and booster shields

 

[PieroAcme]

 

[PieroAcme]

The 1st stage is ready. You can see the boosters stops on top of the vernier thrusters coverage.

 

[PieroAcme]

Decals work. Comparison with the real one

 

[Ez2cDave]

Decals work. Comparison with the real one

Are those from the large decal file I sent you, via Dropbox ?

They look great !

Dave F.

 

[PieroAcme]

Are those from the large decal file I sent you, via Dropbox ?

They look great !

Dave F.

Hi Dave, yes I used most of them. You'll see in the next pictures
Thanks again for the help!

 

[Ez2cDave]

Hi Dave, yes I used most of them. You'll see in the next pictures
Thanks again for the help!

Any time, my friend . . . They look fantastic !

Dave F.

 

[Crawf56]

Well done you!

 

[Ez2cDave]

Брат, я буду с тобой всегда.

Brat, ya budu s toboy vsegda.

 

[PieroAcme]

​

Some pictures of the finished work