Tores mailbox VIIC and VIIC/41 operation and technical details

[Don Prince]

Hello Mr. Tore and All,

Really nice artwork...

Regards,
Don_

[SG]

Don I found another pic of the icebreaker, a frontal closeup. Boat is U 48. hope this helps


http://cubeupload.com/im/SGm/U48Icebrkr.jpg


Cheers,
SG

[Don Prince]

Hello SG,


Thank you, that was like one of the photos that Dougie Martindale emailed to me...


Regards,
Don_

[Don Prince]

Hello Mr. Tore and All,

I have been working with Simon on the vent valve for MBT 1.  Back when I was working on FBT 2, MBT 3, and FBT 4, I discovered the U-570DTPlate28.jpg from the uboatarchive.net was drawn wrong by the Germans where the levers pulled down had the vents closed (WRONG!).

Today Simon noted that the drawing for the vent valve for MBT 1 would never function because the flap valve plate was on the outside of MBT 1. It must be on the inside of MBT 1 to be functional. This was also incorrect in the u-historia.com drawings that I got from them.

I corrected Skizzenbuch and here is the attached corrected drawing...

Regards,
Don_

[Don Prince]

Hello Mr. Tore and All,

During your service on U-995 and U-926 did you have an occasion to examine the construction of MBT 1; the rudder pedestal and the dual rudders? The question:

1. Is there a notch in the top of MBT 1 which allows the rudder pedestal's drive rods to control the dual rudders?
2. Is there a channel passing through MBT 1 which allows the pedestal's drive rods to control the dual rudders?

See the attached drawing... Do you have any images or better drawings?

Regards,
Don_

[tore]

Don.
Referring to the lower image. I guess the rudder drive goes through the pressurehull as shown between frame 3 and 4 to the yoke of the rudders situated in the void space in the freeflood area in the casing under the deck. From this yoke the two rudder rods goes in the freeflooded area to the yoke of each rudder, the two rudder stocks goes in two pipes down to each of the rudders. Thus primarily in the free flood area outside any tanks after leaving the pressurehull.
Tore

[Don Prince]

Hello Mr. Tore,

I could not find an answer to my question about how the pedestal drive rods got to the dual rudders and through MBT 1 in the Type VII C diagrams. However, the Type VII D diagrams do show dual channels passing through MBT 1. In the diagram you can see the pedestal drive arms and the drive rods in the middle of the channels at Spt. -6 frame (See the attached drawing). Do my assumptions look to be correct?

Regards,
Don_

[Don Prince]

Hello Mr. Tore and All,

Let's hope for a Happy Easter and Passover; may the season of Spring renew and heal our world...

Kind regards,
Don_

[Don Prince]

Hello Mr. Tore,


I found this photo of KNM Kya on the internet... I can see the Norwegian designed tower/winter garden.


Regards,
Don_

[tore]

Don. I never saw the photo, but I am pretty sure it is from my time. I know the guy very well, both from the naval academy and later. I am probably on the bridge.
Tore

[Don Prince]

Hello Mr. Tore,

I have a question about the drive shaft to open the vent valve for MBT 1... The hand wheel is located on the control room aft pressure hull on the Port side.

1. The 1st photo shows the diesel room with the MBT 1 drive shaft RED on the port side. The cream colored shaft with a RED hand wheel controls the MBT 2 aft vent valve on the starboard side (this shaft goes to a bevel device to activate the dual vent valves for MBT 2).

2. The 2nd photo shows the drive shaft for MBT 1 vent valve coming through the bulkhead on the starboard side.

I don't see any cross-over of the MBT 1 drive shaft in the diesel room??? Do you have a better photo?

Regards,
Don_

[tore]

Don.
 No wonder, it is hard to discover. Just aft of the fuel daytank, settlingtank, and fore of the pneumatic exhaustvalve grinding machine is a chaincasing containing a chaindrive of the rod from port to starboard. I have superimposed in red the item and if you look carefully at the image you might be able to see the cage.

Tore

[tore]

Don. May be this image with less text makes the chaindrive easier to discover.
Tore

[Don Prince]

Hello Mr. Tore,

Thanks for resolving my MBT 1 vent valve drive rod issue! I don't believe we ever discussed the drive chain before, but again I never asked the question... You are the man!

Regards,
Don_

[Don Prince]

Hello Mr. Tore,

I was able to get a fairly good image for my Skizzenbuch "Addendum Booklet"...

Regards,
Don_