Written RAOFB guide?

[bossfrog]

Originally Posted by don1reed

The angle solver is. The back side is a circular sliderule and has been around since the 1600's.

The circular sliderule was located, as fitted, around the periscope lens, is accurate (as determined by screen resolution).

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

[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.

[joegrundman]

a fellow called klh wrote a superb manual to using these disks on this thread here

http://www.subsim.com/radioroom/showthread.php?t=126824

but the living link is available here

http://www.subsim.com/radioroom/show...1&postcount=72

[quink99]

Originally Posted by joegrundman

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.

You mention that one of these tools is the speed omnimeter,

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.

I wonder if you might tell us where we might find this MOD for SH5?

Thanks

[joegrundman]

Originally Posted by quink99

You mention that one of these tools is the speed omnimeter,



I wonder if you might tell us where we might find this MOD for SH5?

Thanks

ui-boat v5 by reaper7 definitely has it as shown here as the "backside" of the attack disk:



multiple UIs by dark wraith may have it, i don't know

[TheDarkWraith]

Originally Posted by joegrundman

multiple UIs by dark wraith may have it, i don't know

It's there also

[quink99]

Thanks joegrundman,

I thought your reference to a "speed omnimeter slide rule" might be refering to something other than just the back side of the German attack disc. Now I realize that that is what you were refering to.

[joegrundman]

yes, that is it! Alles klar, i hope