Naval History Forums

fsimon wrote: ↑Mon Sep 18, 2023 6:40 am My impression:
FuMG 39 were delivered at 2000 Hz but received 500 Hz transmitters from late 1940 while retaining the designation FuMG 39 due to retaining most of the initially delivered parts including the housing and mountings.

Definitely not!

@Marcello Malara Original plans? No, not plans in a narrower sense. On the whole I would estimate 1.5-2 m shelf space originals (operating manuals, building regulations etc.). @wadinga Thanks for the compliment, but this certainly overexaggerated. There are so many wonderful small design and enginee...

I've colored Hipper's clutch and I hope it helps to understand the mechanism: They used a bevel gear to synchronise the revolutions of the turbine (blue) and propeller (yellow) shaft. In case of indentical revolutions the green part wouldn't rotate anymore (except the upper bevel wheel). The revolut...

Where are you living?

Thank you. I recommend to forget this aggregation of data.

As built, the dimensions of Bismarck and Tirpitz were almost identical, with the latter being a whopping 20 tons heavier and 17cm longer at the waterline. Now, Tirpitz shaved off quite some amount of armor; 5mm main belt, 30mm deck armor over the machinery (while adding 5mm over the magazines), and...

It depends. It's possible to stop the shaft by the turbine and then clamp it by a brake. This brake would work up to about 15 knots. The coupling on Scharnhorst and Bismarck could be coupled while shaft and turbine were running. There was an synchronized revolutions indicator to determine the right ...

Well, there were two different designs of the shaft decoupling. A simple one with removing bolts from the flanges (Nassau- and Bayern-class for example) and a more sophisticated one (Scharnhorst- and Bismarck-class for example). The building regulations for the simple design defined the shape and ma...

marcelo_malara wrote: ↑Fri Jul 07, 2023 6:00 pm Thanks! I am curious, I have never seen this before, was common in turbine ship to have decoupling shafts?

Yes, I think so.

Next I am working on the Gefechtsbildempfänger, 35 in the plan. I am also looking at 36. The plan shows it like this: .... I have just made guesses that it would show target range, speed and bearing for the three fire control computers. But it's purely guesses based on what I can make out from the ...

It's the coupling indicator of the thrust blocks of the three shafts. I assume the lamps indicate "coupled", "coupling" and "decoupled". Hi Marc, Do you have any info how the coupling/decoupling was done? I hope this helps: Hauptkupplung SH .jpg The shaft is decoupled ...

The shafts would have been decoupled from their turbines in case of only one or two turbines and propellers were used. The other propeller(s) was/were decoupled to avoid damage to the stopped turbine(s).
Defect turbines or damaged shafts/propellers would have been decoupled from each other as well.

It's the coupling indicator of the thrust blocks of the three shafts. I assume the lamps indicate "coupled", "coupling" and "decoupled".

IIRC the pressure line on Bismarck was repaired, but the catapult was warped. I assume that they tried to use the starboard catapult, but the torpedo hit from Victorious in that area had damaged it. The port catapult was possibly unusable due to the list.

Rodney didn't change speed, your measurement is simply wrong. Rodney traveled approximately 5 nm between 9:02 and 9:17.