RAOBF

[joegrundman]

Originally Posted by Trevally.

Some good info - thanks all


image removed

As you can see I know the range to target is 720m
I know mastheight is 40.4
The 90deg mark shows that the mast should be 2.25 clicks not 6.75

image removed

Ok in this one I match range to ship lenght (111m)
5.5 clicks on the bow should be 64deg AOB
Actual was 70 deg and should be 5.75 clicks.


Both pics at at 1.5 zoom.

I will read and test the link from TDW next.

How do you know the range is 720m?, anyway in the example, I notice you set the range to 7200m, not 720m

and an AOB reading of 64 instead of 70 can be described broadly as successful. Certainly good enough to shoot with.

EDIT: OK I think i understand the problem now. The point is you are using this at 1.5x, rather than 6x while this RAOBF is set naturally to 6x, therefore there needs to be a division by 4.

If you had set the range to 720m rather than 7200m, it would have shown 22 marks, not 2.2.

However you are using 1.5x instead of 6x so the number of marks needs to be divided by 4. 22/4=5.5, which is it least close to what it does show, although not perhaps close enough..

This implies that the vertical scale is half the size of the horizontal precisely for measuring range at 1.5x, while the horizontal is designed for measuring at 6x and from a position of lock onto target so only one side of the target is measured :hmm:

Seems a slightly long winded way of going about things compared to the simpler original approach of all measurements at same magnification, but i guess there's a reason for it

[Trevally.]

Thanks for the help joegrundman

I think I now understand most of how this works.
I am wanting to test the clicks on the RAOBF.

I have measured the info from map.
Range = 850m
Mastheight = 28.4
zoom is x1.5

Testing range.




Mast should be at 3.5 clicks but shows 4
I use the bottom right marker for zoom x1.5

[Trevally.]

OK next I am testing range with x6 zoom
I use the 12oclock marker for this.
All values are the same as above.



Ok here we see the mast should be at 13.4 clicks but is 16clicks

[Trevally.]

Ok next testing AOB at zoom x1.5
Ship lenght is 120m
Range is 850m



So 4.5clicks x 4 = 18clicks
= AOB at 18.5deg

Actual AOB is 112deg starboard
so 112-90=22deg or 21clicks
21clicks /4= 5.25 clicks rather than the 4.5 shown.

Is this close enough for AOB
Do you think that only the vertical clicks need changing

[Pisces]

Yes, your steps are done correctly, despite vertical graticule marks being wrong.

Instead of multiplying by 4 if you use the 1.5x zoom, you can also drag the moveable wheel counterclockwise from the lower-right index to the 12 o'clock index. And then look at the AOB value aligned to the number of horizontal marks that you see on the graticule scale. That works the same.

[Trevally.]

Originally Posted by Pisces

Yes, your steps are done correctly, despite vertical graticule marks being wrong.

Instead of multiplying by 4 if you use the 1.5x zoom, you can also drag the moveable wheel counterclockwise from the lower-right index to the 12 o'clock index. And then look at the AOB value aligned to the number of horizontal marks that you see on the graticule scale. That works the same.

Thanks for the conformation and the tip Pisces

[joegrundman]

AOBs greater than 90 cannot be shown using this tool, as you realised, but stbd 112 is equivalent to 68. 68 is substantially different from AOB 20 that it gave and is not good enough for targeting.

There is something wrong with the reticule here, or else the technique for using the tool with this reticule needs to be explained further, or else remake the reticule from scratch

edit: you're Orkadian? My parents-in-law live on Orkney!!

[Trevally.]

Thanks joegrundman

I have re-made the reticule - I think I have the vertical correct.
Reading about the AOB I think I've now made a mistake based on this:-

112-90=22deg or 21clicks

If I get vertical correct I can re-do the horizontal.

Posting new test soon.........

edit: you're Orkadian? My parents-in-law live on Orkney!!

Yes Im Orcadian. Small world eh....

My home town here http://en.wikipedia.org/wiki/Stromness

[Trevally.]

Ok I have tested the new reticule

Range to target is 850m and AOB is 117deg - both measured from map
Mastheight is 28.4
Lenght ship is 120m

Pic1



That was zoom1.5 and worked ok


Pic2



So vertical is also good at x6

[Trevally.]

For the AOB

Pic3



Actual aob is 117deg starboard

So 180 - 117 = 63deg
63deg is about 50 clicks on scope /4 = 12.5

So the bow/stern should be on the 12.5 click - where its 5 here
I will re-scale so the 5 is 12.5.

[joegrundman]

That looks good - what did you do to the reticule to make it work?

I've been to Stromness before - lovely little town. My in-laws live around Orphia.

[Trevally.]

I just took the dds file and chopped th e top off.
Then select square (to keep everything in check) and stretch the north/south until the correct click reached my thumb that was marking the screen

If you keep everything in balance it works

Yes I know Orphir well - nice views

[Trevally.]

Ok - range 850m ship lenght120 zoom x1.5




If I reduce by 1 click - ship would be 13x4=52
52=65deg

[joegrundman]

Good job so far! Once you have this calibrated properly, make sure to send it to TDW!

[Trevally.]

Originally Posted by joegrundman

Good job so far! Once you have this calibrated properly, make sure to send it to TDW!

Thanks - yes I will sent him the files

If anyone is following this thread and wants to help - I could do with someone to test the obs scope for me. (I have a prob obs scope and cant use it - If yours is working at x6, can you let me know what mod you are using.)

Ok the updated file is here http://www.filefront.com/17738447/Ne...BF_obs test.7z test.7z

Dont know if it matters but I am using 1400 x 900 res in options when making this.

Only obs and attack are updated. I need to get those dam ships to stop shooting at me to test the uzo