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joegrundman · 12-12-07, 09:22 AM

In the original scope, the stadimeter was attached to the ZielkurswinkelRad (AOB finder). All you had to do was to set the mast height on the basis ring and then the range ring was rotated as you adjusted the angle using the split prisms.

Then for the AOB, you set the known or estimated length of target to match the range, and you physically rotated the optical system of the periscope by 90 degrees. The split prisms then measured the apparent length. Again, this automatically rotated the tool so that it now showed you the AOB. The resulting AOB even showed up in the periscope view, so the kaleun didn't even need to take his eye off the target in order to see the result of his measurement.

Unfortunately we were unable to rotate the stadimeter function, hence we have used the measuring system using the reticule marks. I assume it's what they were there for, anyway, as a backup incase the stadimeter malfunctioned.

As for the doubled mastheight, this is so that the lower part of the AOB finder isn't used, which OLC considered important as it is often obscured by the recog manual and TDC

joe

12-12-07, 09:22 AM	#308
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	In the original scope, the stadimeter was attached to the ZielkurswinkelRad (AOB finder). All you had to do was to set the mast height on the basis ring and then the range ring was rotated as you adjusted the angle using the split prisms. Then for the AOB, you set the known or estimated length of target to match the range, and you physically rotated the optical system of the periscope by 90 degrees. The split prisms then measured the apparent length. Again, this automatically rotated the tool so that it now showed you the AOB. The resulting AOB even showed up in the periscope view, so the kaleun didn't even need to take his eye off the target in order to see the result of his measurement. Unfortunately we were unable to rotate the stadimeter function, hence we have used the measuring system using the reticule marks. I assume it's what they were there for, anyway, as a backup incase the stadimeter malfunctioned. As for the doubled mastheight, this is so that the lower part of the AOB finder isn't used, which OLC considered important as it is often obscured by the recog manual and TDC joe __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill Last edited by joegrundman; 12-12-07 at 09:32 AM.