SUBSIM Radio Room Forums - View Single Post - Question regarding different range results with different magnifications.

Hooston · 12-06-23, 06:00 AM

If you treat the angle, range, mast height problem as an arc rather than a triangle you arrive at how the marks are supposed to be used and why 10/16 degrees...

range in m = (mast height in m / target angle in degrees) * (180/pi)

Using the correct historical markings the range in hectometres as entered in the TDC is simply mast height in metres/number of ticks on scope. Unfortunately various mods have messed this up in various ways and it is further complicated by periscope, Uzo and x6 (and in some cases x12) magnification. However whatever your setup the starting point is mast height divided by number of ticks - then multiply by some mod specific scaling factor... Use the convoy attack training mission and have a play with your setup - there's a destroyer nicely positioned ~1km in front of you and it will not attack until you do something unpleasant.

In my case the periscope is marked in degrees at the widest zoom, so at 1.5 zoom

range in metres = 57 x mast height/ticks
but at 6x zoom
range in metres = 230 x mast height/ticks

This puts you back in calculator territory. Most GUI's have some clever tool to do the sums for you. Pedants please note I've rounded the numbers to 2 decimal places!!

As some folks have said you should not need an accurate range, in real life the mast height would not be known accurately and the angle was difficult to measure.

12-06-23, 06:00 AM	#3
Hooston 中国水兵 Join Date: Jun 2020 Posts: 279 Downloads: 16 Uploads: 0	Beware of tangents for they are subtle and quick to anger If you treat the angle, range, mast height problem as an arc rather than a triangle you arrive at how the marks are supposed to be used and why 10/16 degrees... *range in m = (mast height in m / target angle in degrees) (180/pi)** Using the correct historical markings the range in hectometres as entered in the TDC is simply mast height in metres/number of ticks on scope. Unfortunately various mods have messed this up in various ways and it is further complicated by periscope, Uzo and x6 (and in some cases x12) magnification. However whatever your setup the starting point is mast height divided by number of ticks - then multiply by some mod specific scaling factor... Use the convoy attack training mission and have a play with your setup - there's a destroyer nicely positioned ~1km in front of you and it will not attack until you do something unpleasant. In my case the periscope is marked in degrees at the widest zoom, so at 1.5 zoom range in metres = 57 x mast height/ticks but at 6x zoom range in metres = 230 x mast height/ticks This puts you back in calculator territory. Most GUI's have some clever tool to do the sums for you. Pedants please note I've rounded the numbers to 2 decimal places!! As some folks have said you should not need an accurate range, in real life the mast height would not be known accurately and the angle was difficult to measure. Last edited by Hooston; 12-06-23 at 11:45 AM.