Can someone explain stadimeter in detail?

[DJSatane]

I understand math behind stadimeter(or at least I beleive I do).

http://www.cuih.net/st.gif

What I don't understand is why do we need to put double image, does it help to estimate the angle A better?

I understand that once we have side x distance and angle A, the system uses tan(A) = x/y. This way we can get distance or value of y. But how does exactly stadimeter calculate angle A? Can anyone shed some light on the mechanics behind it?

[fullmetaledges]

I think the purpose behind the double image is as the range changes so does angle A. They figured an easy and quick way to figure out angle A and put it into the equation would be to superimpose an image and have you line up the mast to the water line. If x=mast height and angle A=the angle between ownship and target mast height and y equals range than. Range= x multiplited by the cotangent of angle A. it's just an easy way to figure out that equation without a pencil and paper, remember they had no calculators

[NefariousKoel]

Yes, and the other popular way to use a stadimeter is to take a periscope photo and drag one half of it down so the highest mast is level with the waterline. That's great if you have the waterline perfectly lined up.

At least with the offset photo, you can compare it with exactly where you had the scope lined up on it originally. I love it.:arrgh!:

[DJSatane]

thanks.

[P_Funk]

Yes, and the other popular way to use a stadimeter is to take a periscope photo and drag one half of it down so the highest mast is level with the waterline. That's great if you have the waterline perfectly lined up.

At least with the offset photo, you can compare it with exactly where you had the scope lined up on it originally. I love it.:arrgh!:
That is indeed one of the few clear advances that SH4 has made. Not very realistic but still neat.

[Immacolata]

Wasnt it like that on US Subs? I thought I read somewhere that there was a special mirror optics used to create this superimposed mirror image that the periscope operator could manipulate.

[P_Funk]

Wasnt it like that on US Subs? I thought I read somewhere that there was a special mirror optics used to create this superimposed mirror image that the periscope operator could manipulate.
REALLY?! Okay I take it back. If thats real then that is a major bit of realism that the devs came up with AND its incredibly functional. I say, good show.:up:

[Tranton]

Wasnt it like that on US Subs? I thought I read somewhere that there was a special mirror optics used to create this superimposed mirror image that the periscope operator could manipulate.

Yeah I think in one of the Dev interviews they mentioned that the stadimeter on a WWII fleet sub operated different than the Nazi one and used a double image.

[Nightmare]

Yes, that is how the stadimeter functioned in real life. Go to this page (http://www.fleetsubmarine.com/periscope.html) on fleetsubmarine.com and scroll down to "periscope controls."