1/48 scale Type VIIC U-201 build

[Monahan Steam Models]

I'm impressed. Can't wait to see what you'll do to the Bronco XXIII.

Thank you Romel,

The Type XXIII will be much simpler. At least I say that now…

Nick

[redboat219]

I'm impressed. Can't wait to see what you'll do to the Bronco XXIII.

[Monahan Steam Models]

Tom and Steve,

Thank you!

Did a bit more design work today. Figured out the rudder linkages and parts that I’ll need to make. Also worked out the linkage and correct rocker link ratio for the muzzle door to open and close properly with the stroke available from the pneumatic cylinder. The assembly pictured below will eventually be separated horizontally at the centerline of the torpedo tube creating a the base that can be bolted to the hull and the upper half bolted to the base. Not pictured below is a third forward mount I’ve begun designing that will support the breech end of the launch tube as well as possibly provide a mounting system for two small copper airbrush Propel storage tanks situated between the propeller shafts. One tank for the emergency gas ballast back up system and the other for the torpedo system.



Nick

[trout]

Nick, what a wonderful mind you have! That is a great system you have there!

[SubDude]

Here’s a stripped down basic demonstration of the torpedo launch technique that I use for the tubes in the type VIIC build. The torpedo, wether it is electric or gas propelled is pushed out of the launch tube by a floating piston in the tube. The piston is moved down tube from the breach of the tube towards the muzzle end by a volume or air that will only allow this distance of travel and no further movement for the piston (after that air volume pushing the piston forward down the tube runs out, this will quickly become vacuum thus stopping the piston’s travel). When this happens the torpedo keeps traveling forwards out the tube and the piston stops.

Video: https://m.youtube.com/shorts/8t01DNrbRtI

Launch tube mechanism using only a short blast of air to make multiple stages happen in a sequence.

Video: https://m.youtube.com/watch?v=zRsGPZW8eD0

End result

Video:

https://m.youtube.com/watch?v=arGAS3kn_wU

Amazing job on this Nick. It is coming right along.

[Monahan Steam Models]

Sure , here you go.

Thank you Sam V!

[Monahan Steam Models]

Here’s a stripped down basic demonstration of the torpedo launch technique that I use for the tubes in the type VIIC build. The torpedo, wether it is electric or gas propelled is pushed out of the launch tube by a floating piston in the tube. The piston is moved down tube from the breach of the tube towards the muzzle end by a volume or air that will only allow this distance of travel and no further movement for the piston (after that air volume pushing the piston forward down the tube runs out, this will quickly become vacuum thus stopping the piston’s travel). When this happens the torpedo keeps traveling forwards out the tube and the piston stops.

Video: https://m.youtube.com/shorts/8t01DNrbRtI

Launch tube mechanism using only a short blast of air to make multiple stages happen in a sequence.

Video: https://m.youtube.com/watch?v=zRsGPZW8eD0

End result

Video:

https://m.youtube.com/watch?v=arGAS3kn_wU

[Sam Victory]

Sam V,

Thank you. Yes I did notice from the post you made earlier that there must’ve been more photos you posted but they weren’t showing up when I saw your post. I have had that happen with posts that I have made. If it is not too much trouble, would you mind posting the second schematic from your original post?

Thank you,

Nick

Sure , here you go.

[Monahan Steam Models]

The two pictures I posted earlier are also from the book "Vom Original zum Modell_ Uboottyp VIIC", but strangely they don't seem to show up on the forum (but they work fine on my computer).

V

Sam V,

Thank you. Yes I did notice from the post you made earlier that there must’ve been more photos you posted but they weren’t showing up when I saw your post. I have had that happen with posts that I have made. If it is not too much trouble, would you mind posting the second schematic from your original post?

Thank you,

Nick

[Sam Victory]

Nate,

This is great! Thank you! Yes it helps a ton! I have similar drawings but the details are much smaller to see.

This is what I have come up with so far for the Arkmodel type VIIC.



The image quality of the CAD screen shot saved at a low quality but it still shows the basics. Haven’t added the muzzle door well yet and have more design work to do on the various linkages and such. It’s getting there a bit at a time.

Nick

The two pictures I posted earlier are also from the book "Vom Original zum Modell_ Uboottyp VIIC", but strangely they don't seem to show up on the forum (but they work fine on my computer).

V

[Monahan Steam Models]

Hi Nick,

Here are the schematics showing the rear torpedo tube door and its associated linkages on a Type VII. This is from the book "Vom Originale zum Modell Uboot Typ VII" by Fritz Kohl:



The semi-spherical outer door is shown as a dotted outline I believe.

Hope this helps,

Nate

Nate,

This is great! Thank you! Yes it helps a ton! I have similar drawings but the details are much smaller to see.

This is what I have come up with so far for the Arkmodel type VIIC.



The image quality of the CAD screen shot saved at a low quality but it still shows the basics. Haven’t added the muzzle door well yet and have more design work to do on the various linkages and such. It’s getting there a bit at a time.

Nick

[neitosub]

Hi Nick,

Here are the schematics showing the rear torpedo tube door and its associated linkages on a Type VII. This is from the book "Vom Originale zum Modell Uboot Typ VII" by Fritz Kohl:



The semi-spherical outer door is shown as a dotted outline I believe.

Hope this helps,

Nate

[Monahan Steam Models]

Same, that is how I remember it (from research not first hand).

Awesome thanks Tom!

[Monahan Steam Models]

I was trying to find a photo of that tube in my own research stuff, but couldn't find it. the way you describe it is how I remembered it being documented/photographed.

Thank you for looking through your files for these details as well.

I’ve run across some great photos posted on other sites showing details of the rear tube and that is also how I recall the muzzle door and area just aft of it looking before the steel hull panels take on the tube shape the rest of the distance aft.

Unfortunately the U-995 that still survives today has had a lot of it outer hull details replaced and sealed up over the years to combat the deterioration. The forward torpedo shutters and aft muzzle door areas have been sealed up. Early photos of the boat when it was first placed where it is today clearly show the changes it has gone through when compared to present day appearance.

[trout]

I was trying to find a photo of that tube in my own research stuff, but couldn't find it. the way you describe it is how I remembered it being documented/photographed.

Same, that is how I remember it (from research not first hand).