Rangefinder fix?

Schizo · 01-25-22, 11:17 PM

I'm just getting back into SUBSIM and have found in practice and in reading that the Stadometer "rangefinder" is incorrect. Is there a fix for this other than just using the Ruler in map mode? I currently am running just TWoS and nothing else.

derstosstrupp · 01-26-22, 10:33 AM

I don’t use the stadimeter so I’m not sure about any bugs. But keep in mind that, if you set up your shot so the gyro angle is low (say within 30° of your bow), meaning the torpedo won’t turn much or at all, range won’t matter to the solution. Prewar scopes had a stadimeter device, but it is for the above reason that wartime periscopes removed this feature, and also because target parameters like length and height were seldom known or relied on. Course and speed data was typically gathered on the surface at long range by either matching the target’s course and speed, or by plotting using rough ranges based on how much mast was showing above the horizon.

In practice, if range needed to be determined at the shot, usually for situational awareness, it was estimated using the vertical scale in the periscopes, or also by how much the target filled the lens horizontally (the prevalent method with the UZO, which only had a vertical line). I would suggest practicing this type of eyeball method, and also striving for a low-gyro shot whenever possible to mitigate solution errors caused by inaccurate range.

Schizo · 01-26-22, 04:31 PM

Thanks for the tip. I'll look into eyeballing with the periscope.

derstosstrupp · 01-26-22, 06:16 PM

I usually end up assuming a mast height of anywhere from 30 to 35 m for most merchants, and then use the centiradians in the periscope to get a feel for range. Just mentally divide target height by the number of marks he takes up to get the rough range.

So say you estimate target height as 30 m, and at 1.5xmagnification he takes up three marks, he is 1000 m away. If he takes up three marks at 6x magnification, he is 4000 m away. For 6x magnification you need to multiply by four.

les green01 · 01-29-22, 03:57 PM

what i did was setup missions with differnt aobs,range,speed keep running though until i could eyeball everything

01-25-22, 11:17 PM	#1
Schizo Seaman Join Date: Mar 2021 Location: United States Posts: 31 Downloads: 1 Uploads: 0	Rangefinder fix? I'm just getting back into SUBSIM and have found in practice and in reading that the Stadometer "rangefinder" is incorrect. Is there a fix for this other than just using the Ruler in map mode? I currently am running just TWoS and nothing else.

01-26-22, 10:33 AM	#2
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 913 Downloads: 490 Uploads: 0	I don’t use the stadimeter so I’m not sure about any bugs. But keep in mind that, if you set up your shot so the gyro angle is low (say within 30° of your bow), meaning the torpedo won’t turn much or at all, range won’t matter to the solution. Prewar scopes had a stadimeter device, but it is for the above reason that wartime periscopes removed this feature, and also because target parameters like length and height were seldom known or relied on. Course and speed data was typically gathered on the surface at long range by either matching the target’s course and speed, or by plotting using rough ranges based on how much mast was showing above the horizon. In practice, if range needed to be determined at the shot, usually for situational awareness, it was estimated using the vertical scale in the periscopes, or also by how much the target filled the lens horizontally (the prevalent method with the UZO, which only had a vertical line). I would suggest practicing this type of eyeball method, and also striving for a low-gyro shot whenever possible to mitigate solution errors caused by inaccurate range. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ

01-26-22, 06:16 PM	#4
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 913 Downloads: 490 Uploads: 0	I usually end up assuming a mast height of anywhere from 30 to 35 m for most merchants, and then use the centiradians in the periscope to get a feel for range. Just mentally divide target height by the number of marks he takes up to get the rough range. So say you estimate target height as 30 m, and at 1.5xmagnification he takes up three marks, he is 1000 m away. If he takes up three marks at 6x magnification, he is 4000 m away. For 6x magnification you need to multiply by four. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ

01-26-22, 04:31 PM	#3
Schizo Seaman Join Date: Mar 2021 Location: United States Posts: 31 Downloads: 1 Uploads: 0	Thanks for the tip. I'll look into eyeballing with the periscope.

01-29-22, 03:57 PM	#5
les green01 Seasoned Skipper Join Date: Jan 2002 Location: Freeman Missouri Posts: 1,784 Downloads: 1405 Uploads: 0	what i did was setup missions with differnt aobs,range,speed keep running though until i could eyeball everything