Written RAOFB guide?

[joegrundman]

Originally Posted by bossfrog

So WWII subs did have the circular slide rule around the periscopes. Thanks.

let's clarify that there are 3 rotating tools from the old u-jagd tools mod for sh3 that have been (improved) and ported over to sh5.

There is the RAOBF which goes around the periscope view, used for determining range, aob, or ships length and height if you start from the opposite side of the problem.

There is the attack disk (angriffscheibe) used to flip rapidly between determined aob and target course

There is the speed omnimeter slide rule which is used for many calculations, but primarily for calculating interception angles between sub and target, but also can be used for finding torpedo lead angles and many other things too.

The RAOBF is a copy of a ww1 tool that was fitted to the eyepiece of ww1 and early ww2 periscopes. Later in ww2, the German periscope changed to an advanced binocular design with a chair for the viewer to sit on. The binocular design did not have the ww1 era split-prism. That had to be abandoned to enable the binocular effect which was considered by all to be far advantageous to the split-prism.

But on a computer screen we cannot yet create true binocular vision, so it is advantageous to us to stick with the ww1 and early ww2 (and the us style) model of split prism with RAOBF.

The attack disk was a historical tool clearly of ww1 or earlier ancestry

the speed omnimeter is just a slide rule. the particular design is derived from the back side of the USN equivalent of the attack disk, the Is-Was, or Submarine Attack Course Finder. It is not derived from any known slide rule of the KM, but it is clear that the Germans knew all about slide rule technology since they were invented in the 1600s. The KM, like other navies' undoubtedly had a whole range of sliderules for solving all mathematical problems pertinent to being a submarine at sea.