Ranging and fire control problem

[Charos]

I would like to invite others to test and see if they conclude as I have that the Attack periscope as well as the TBT field of view and graticule markers are not correct.

This also affects the TDC as its using the wrong parameters.


The following screenshots are of a stationary Iowa class Battleship broadside With a
S-Class submarine also stationary.

The attack periscope should have a FOV of 8 Deg divided by 32 graticule markers of 0.25 Deg each. (In high magnification 6X setting)

The Iowa is 270M long and has a mast height of 46M.

Now for an 8 Deg FOV to see the Iowa fill the entire screen would require a range of
135M/Tan 4 Deg = 1930M .


Now for a mast height of 46M and a Range of 1406M (This range is from game stadiometer) we see the mast fills 5.5 Graticule markers in the Attack periscope (see attached screen shot)









Each marker SHOULD be 0.25 Deg (IE 8 Deg/32 = 0.25) as per game manual.

Mast /Range = Tan (Theta) in this case Theta = 0.25*5.5 = 1.375 Deg.

Solving for Range = 1916M (Which is very close to the previous 1930M and within error tolerance reading from stadiometer)


Note the Iowa in SH4 fills the 6X attack scope at approx 1680M (see attached screen shot)

Also note that the TDC via the stadiometer provides us a range of 1406M (see attached screen shot)

Something is clearly wrong…Yes?


Now lets dig a little deeper into the problem………………


To cut a long story short the Graticule markers are not 0.25 Deg but approx 0.29 Deg.

135M = Half Iowa Length.
4.64 Deg = Half Attack Periscope FOV.

IE: 135M/4.64 Deg = Range
Range = 1663M (Which is correct in our example).


So that attack periscope markers on 6X and its associated FOV work off 0.29 Deg per graticule marker for its 9.3 Deg of view.

But what happened to our TDC its showing 1406M ????

Well its working off approx 0.34 Deg per marker for Range finding (IE: off the vertical graticule scale) which makes things even more strange.

Hope this all makes sense.