Scratch Build Soviet Project 667 BDRM Delta IV SSBN K-18 "Karelia" Scale 1/140

[He Who Shall Not Be Named]

That's neat, don't recall seeing that in the past. I take it that limits the depth of the scribed lines to make them uniform.

Thanks, Andy. Used 'em for years. Just never thought to include the device in past illustrations and photos. Duh!

David

[trout]

Thank you Andy, I was thinking the same thing, but just was not sure.

David, that is really a smart idea!

[Subculture]

That's neat, don't recall seeing that in the past. I take it that limits the depth of the scribed lines to make them uniform.

[Davidh]

Hi David,

Thanks for the pictures of how to do scribing and more importantly the tools to do it. Last week I took one of my small round files and pretty much did what you have shown here. I've only just started using it on the Fin that I have been working on however for the stern of the hull I haven't applied it. I will get back to the scribe work around the vents towards the rear of the boat, later.

I started developing the scoops that are on the rear of the hull a couple of weeks ago. I use a Dutch 3D modelling program called Blender. It is a fantastic program. It does everything and is very underrated in my opinion. So pretty soon I managed to get four scoops that are identical. Send the file to the printer and then print off the design.






The great thing about 3D printing is that you can get identical parts very easily. Also the level of detail is quite high. The major drawback is the visibility of all the layers. It takes quite a few sprays of spray putty to blend them in none the less.


The four scoops needed several sprays of putty then lots of sanding. Then more filler and spray. At the front of the inlet is a square type design that I could make out from some blurred photos and some diagrams that I have found on a Russian website. I don't have any really clear close up pics of these inlet scoops. If any one has any good close up pics of the scoops, then that would be greatly appreciated.

I then marked out the location of these scoops on the lower hull sides of the rear hull. After marking these out I created a profile by cutting out the shape of the flat surface of the scoop onto 1mm thick styrene. This profile would be glued onto the hull and create the outline for the scoop molded into the lower hull. I will then add a small amount of filler around the outside of the styrene profile just to smooth it over and give it a smooth transition between the two.





















As can be seen these scoops are in line. What look like outlet ducting alternates between the two. If anyone has pics of these that would also be greatly appreciated. I have yet to design these so any inspiration beyond the grainy pics and line drawings would be greatly appreciated. I intend on drilling a small hole into the flat base section of each scoop and then drill a corresponding hole into the molded profile at the right spot to put a small stainless screw or other mechanical fixing and not just rely on a glue fix that could easily snap off when the boat is being moved around on the bench.


David H

[He Who Shall Not Be Named]

[He Who Shall Not Be Named]

Smart-ass!

But you're right, I did promise. I hope to knock that obligation off this weekend. Sorry about the delay, David.

David

David

[DMTNT]

Smart-ass!

But you're right, I did promise. I hope to knock that obligation off this weekend. Sorry about the delay, David.

David

Hey! That is an honor that I do not take lightly. Still think it was incredibly generous of you and Ellie to invite me over like that. I enjoyed every minute. Thank you again for that!

[He Who Shall Not Be Named]

To obtain true enlightenment, one must make the pilgrimage to the hallowed garage in person ;-)

Smart-ass!

But you're right, I did promise. I hope to knock that obligation off this weekend. Sorry about the delay, David.

David

[DMTNT]

Oh, By the way HWSNBN. I am awaiting the write up on scribing.

thanks, Dave.

To obtain true enlightenment, one must make the pilgrimage to the hallowed garage in person ;-)

[Davidh]

Hi Bart and thanks for the file. There were a couple of images of the escape hatch from a higher angle that I had not seen previously.

I could detail up the escape hatch to the Nth degree and go for every little detail but decided at this point to get as much detail that would be seen at a distance and would still look good. I also detailed around the smaller hatch and raised it. I used a tiny piece of brass wire to give detail to the pivot arm structure at the centre of both hatches. I then pasted some filler into the recess where the escape hatch is and lowered the escape hatch in place. This should give an even squish in which I just go around with sandpaper to smooth out.




Now that details have come to light from Barts pics, I will be doing a little further detail to the escape hatch. Filling in and sanding back the rim where the joint between the half circle styrene piece fits over the brass hatch. Once all the filling is in I will take some time to sand back around the rims and reduce the paper to smoother and smoother till it gives a good smooth finish with the primer. You can see this is needed just around the rim of the escape hatch. I have also added some more brass detail onto the raised hatch behind the escape.







I left the back of the boat and then started looking at the development of the drainage/ limber holes in this boat. This boat has more limber holes that most so working them out and making sure that they correspond to the right place on both sides has taken some time. I marked them in place initially with pencil and then went over them again in marker pen. The biggest concentration being around the rear of the missile deck section as it angles down. They are mainly in two rows in clusters.




Mostly I would be scribing in PVC pipe and filler. A lot of the limber holes occurring over area that had created a filleted curve, where the missile deck transitions into the hull. I then took out the scribe and started the slow process of scribing each individual limber hole. This is a lengthy process. Towards the back of the boat the hull transitions once again from PVC to timber so I have had to Dremel out the area where I will be scribing near the rear hatches.



David H

Oh, By the way HWSNBN. I am awaiting the write up on scribing.

thanks, Dave.

[bwi 971]

The piece that you are working on is the escape chamber......I knew I posted some pictures of it......here is the link David.
Will keep looking for you.

https://forum.rc-sub.com/forum/general-topics/122138-delta-iii-question

Grtz,
Bart

[Davidh]

Hello all,

After spending a fair amount of time getting the angled rear deck transition just right, smooth and consistent, I then got to thinking about the stern hatch detail around the vertical rudder at the back. The problem that I had was that I didn't have a lot of good photo's looking straight down on the hatches towards the rear. There are quite a few photos of the these hatches from a low angle. This means that some amount of interpretation was needed to work out the geometry. These are the kind of pics that I'm talking about here.






This back end of the 667 has a fair amount of detail as there are lots of hatches and fitting crowded into a relatively small space. These features mainly center around the recessed hatch that is angled at the front so that it is level rather than angled with the gradual curve of the rear hull. This main hatch has a couple of features that have proven a little difficult to interpret. As mentioned I have had a hard time finding good overheard shots of this hatch to mark out the structure and shape of the hatch and its overall geometry. In the center is a raised section that looks like a release mechanism, but what took me a while to work out was the semi circle plate at the front of the hatch that is raised.

Firstly I got onto the lathe and found the last decent sized piece of brass round bar I could find. I then stuck this in my trusty lathe. I have said this before and I'll say it again, If you are a scratch builder, get a metal lathe. The best thing ever. I really enjoy turning, I'm not great at parting but facing and turning is good fun and so the opportunity to create a hatch on the lathe rather than 3D printing was always a good option. I don't get to spend as much time turning as I'd like. I drew up the hatch that I wanted to create and started machining the excess material.






As you can see from the plan view the stern area of the 667 is a bit crowded. The turned up brass part is here after the fun that was parting off. This hatch will feature a styrene semi circle cover over the front section. A little bit of polishing and then recessed in to the back of the hull. I took the Dremel and ground out a section of the hull where the hatch would be located and also the circles where I would fill in with filler then scribe out. I had to grind the main hatch area out a bit further to get the depth required for the brass hatch piece to fit in.




Once the filler was in with a level of over filling I could then sand down the circles and get them flat. I could them scribe the numerous circles that are in this are of the stern. I measured out the size of the semi-circle plate that would need to be fixed to the front of the hatch. I took a .5mm sheet of styrene and marked out at cut the semi-circle. I then filed it back and worked out where to glue it onto one side of the hatch.





I noticed that there is a circular metal plate just behind the main hatch. It looked welded or screwed down to the hull. This would Ideally be replicated by creating a styrene circle that would simply glue over the top. This was also the case with a smaller circle in the centre of another scribed circle.





More later.

[trout]

I think David is getting more crotchety in his old age (if that is even possible) LOL

[bwi 971]

**** you!

David
the horrible

.......roflmao

[He Who Shall Not Be Named]

'Merrimen zen' - There's a moniker that might get quite a bit of use in the future! We are the Pilgrims, master; we shall go
Always a little further; it may be
Beyond that last blue mountain barred with snow
Across that angry or that glimmering sea.

**** you!

David
The Horrible