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Storm501 · 02-06-21, 04:08 AM

@NiceSub

Two ways to determine range. First based on formula here for the more realistic periscopes mod. https://www.subsim.com/radioroom/sho...d.php?t=165408

1) Mast height 33,5m x 4000 / (14 ticks x 10 mil/tick) = 957m range

Second method which I mentioned earlier, about filling the UZO/PER with target length.
2) Target lenght is 137,7m. We work with the table below...

Code:

Ship  /    length /  UZO /      6x /    1,5x 
LINER /    220 /    2000 /    1800 /    500   
LMER /    180 /    1600 /            1500 /    450
TANK /    160 /    1500 /            1200 /    400
MMER /    100 /    900 /            800 /    200
SMER /    75 /    700 /           600 /    120
BOAT /    25 /    200 /      160 /    40

If the ship aspect is outside AOB90, divide the above by this.

AOB    60    1,13x        
/////    45    1,42x        
  /////    30    2x

So 137,7m is between TANK160/1500m and MMER100/900m. A bit on the larger side. So we can interpolate that the range is 1270m. If we can agree that the ship is AOB110 (same effect as AOB70), we can divide the range with a factor of 1,1. So we get 1155m considering the AOB effect on apparent length of the ship.

Final results:
1) 957m
2) 1155m

Neither method will never be completely accurate, the target is roughly at 1000m range.

The tick method becomes really difficult around 1000m range as target fills the UZO and it is difficult to count all the ticks above 10. So that is why the faster FOV method becomes really useful at close ranges.

02-06-21, 04:08 AM	#7
Storm501 Seaman Join Date: Mar 2019 Location: Helsinki, Finland Posts: 36 Downloads: 81 Uploads: 0	@NiceSub Two ways to determine range. First based on formula here for the more realistic periscopes mod. https://www.subsim.com/radioroom/sho...d.php?t=165408 1) Mast height 33,5m x 4000 / (14 ticks x 10 mil/tick) = 957m range Second method which I mentioned earlier, about filling the UZO/PER with target length. 2) Target lenght is 137,7m. We work with the table below... Code: Ship / length / UZO / 6x / 1,5x LINER / 220 / 2000 / 1800 / 500 LMER / 180 / 1600 / 1500 / 450 TANK / 160 / 1500 / 1200 / 400 MMER / 100 / 900 / 800 / 200 SMER / 75 / 700 / 600 / 120 BOAT / 25 / 200 / 160 / 40 If the ship aspect is outside AOB90, divide the above by this. AOB 60 1,13x ///// 45 1,42x ///// 30 2x So 137,7m is between TANK160/1500m and MMER100/900m. A bit on the larger side. So we can interpolate that the range is 1270m. If we can agree that the ship is AOB110 (same effect as AOB70), we can divide the range with a factor of 1,1. So we get 1155m considering the AOB effect on apparent length of the ship. Final results: 1) 957m 2) 1155m Neither method will never be completely accurate, the target is roughly at 1000m range. The tick method becomes really difficult around 1000m range as target fills the UZO and it is difficult to count all the ticks above 10. So that is why the faster FOV method becomes really useful at close ranges. Last edited by Storm501; 02-06-21 at 04:17 AM.