Tores mailbox VIIC and VIIC/41 operation and technical details

[Katuna]

I looked a little closer at the switch photo and noticed the fuses on the bottom right. Those are still used today. Those look, physically anyway, to be about the size of a 2000A fuse.


I'm curious, is that a handle in the center to close the switch? Good thing the operator is protected by the lightning bolt labels. Metal handle around all that electrical? No thanks. I give electrical a lot of respect when working around it. If it is a disconnect handle, you'd think they would at least put a wood or bakelite hand grab on it.

[Don Prince]

Hello Katuna,


The circuit diagram of the main switchboard and batteries for the Type IX U-Boat (diagram attached) clearly shows the additional fused circuits.


Regards,
Don_

[Don Prince]

Hello Mr. Tore,


When surfacing Q Tank is being flooded...  Air is going from Q Tank through the muffler internal to the pressure hull. Is there a means to determine when Q Tank is fully flooded other than water at the muffler?  I must have forgot something during our discussion years ago...


Regards,
Don_

[Don Prince]

Hello Mr. Tore and All...


Skizzenbuch: U-Boat Type VII C Project


Copyright (C) Donald M. Prince, Tore Berg-Nielsen,
Maciek Florek, Simon J. Morris, and Mark Hessburg

Published and distributed in the United States of America by
Kristallklar Publishing, LLC

Library of Congress Registration No. TXu002150468
Service Request No. 1-7130055519
Effective Date of Registration: December 4, 2018                                 

First Release Date: August 15, 2019
(with minor corrections)

Regards,
Don_

[Katuna]

Can't wait! Counting the days.

[Raymic1]

Awesome. 2 weeks to go....

[Raymic1]

Hello Raymic1,


In this case:

1. High speed would be battery serial (220 VDC unregulated) and the e-motor armatures in parallel (least resistance and higher current flow).
2. Low speed would be battery parallel (110 VDC unregulated) and the e-motor armatures in series (greatest resistance and lower current flow).


The term "switched together" is not technical enough and must be defined? As together in battery in parallel, or as together in battery in series. It looks like he meant Parallel for low speed...


Regards,
Don_

Quite a nice easy explanation here from below.

Using the motor - series-parallel - switch and battery - parallel-serial - switch three drive speed ranges corresponding three voltage ranges can be set (see E Sketchbook)
		1. Batteries in parallel, armatures in series 2. Batteries in parallel, armatures in parallel 3. Batteries in series, armatures in parallel [/t]
		Within these three ranges, further adjustments can be done by changing the current in shunt windings using the double motor field rheostat.
U-boat Information
	for
	U-boat Type VIIC

[Katuna]

Tore - Have a question on the valve wheels that are sticking up from between the rocker arms on the engines. It looks as if they go to the fuel pipe from the injector. In the photos below I have identified what looks like one of the valves and stem on the cylinder farthest forward (my arrow should be a little to the left). I assume this would be to shut off fuel flow to the cylinder if needed. I just need to verify if that is where those small handwheels go to.


As always, thank you.

[Don Prince]

Hello Hatuna,


Earlier. I looked in the wrong place on my notes... I believe this valve is the Vent/Drain Fuel Valve... However, it's best to wait for an official answer from Mr. Tore...


Regards,
Don_

[Katuna]

Don - I believe Trumpeter had originally planned on adding a handle and just forgot. If you look at the photo you can see the stems sticking up. I'm sure that's where the handle is supposed to go.


Like you said, best to wait for the man in the know to weigh in.


I wish I could find more of Simon's engine drawings. I have a few plan views and pieces of the side views. They're immensely helpful.

Now that I look at the detail drawing you posted, it looks as if Trumpeter mis-designed the fuel line thinking that was where the valve/handle was at and didn't make a handle. Who knows with Trumpeter. Design by committee.

[Don Prince]

Hello Katuna,


There is a missing link in the model...  See my photo...


Regards,
Don_

[Raymic1]

FYI
As there seem to be no photos of either battery conditioning rooms the latest Game U Boat has this modelled as their interpretation.
Anyone know exactly what the electrical gear looked like inside?
Thanks

[Don Prince]

Hello Raymic1,


I only have one photo of the battery room where the crewman is laying on a trolly and checking the battery acid...


Regards,
Don_

[Don Prince]

If you are referring to the battery buss connections in the e-room to the Switchboard control panel; I only have somewhat of a view for the Type IX Switchboard... I assume there would be shielded copper cables going to the Switchboard connection bars.

Regards,
Don_

[Don Prince]

This is a Type IX C photo and the title is "Battery room of a Type IX C-Boat under construction"....