Quote:
Originally Posted by Deepseadiver
Can you explain these two charts a little please gutted. I am a slow learner and still find it difficult to work out solutions manually.
cheers
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both charts are only useful if you are attacking from a 90 degree angle.
Lead angle chart:
If you have your TDC setup for a 90 degree attack, the bearings in the chart are exact positions in the scope that the torpedoes will fire straight and never turn. Which is good, because it means the range in the TDC is irrelevant. Range only matters if the torpedo has to turn (or you care about estimated time to impact). How far a torpedo has to turn has an exact relationship to how accurate your ranging needs to be. You could also decouple the TDC from the scope entirely, set the TDC bearing to 0, speed to 0, and then merely put the scope on the correct lead angle bearing and fire when a ship passes through it... though not recommended because you wont be able to swivel to other angles and take pot-shots.. due to the AOB not getting updated. The torpedo in wolfpack is the G7e 30kt electric. Use the 30kt column. Note: lead angle in this context means moving the scope TOWARDS the target from bearing 000 such that the torpedo will fire straight down 000 and never turn.
Range Bearing chart:
If you are heading at a target from a 90 degree angle, known ranges at any bearing can be translated to a range for any other bearing. If a target at 315 is measured to be 3500m, you are 2500m away from the interecpt point. The point where the target will cross your 000 bearing. This is good for knowing if you need to speed up or slow down to reach a desired shooting range.
A couple of interesting things can be observed if you look closely. A target 60 degrees left or right is exactly double the range if it were at 000 degrees. Also, after firing at a target in front of you, you can swivel your scope up to 15-20 degrees left or right and fire at other ships (in the same column line of a convoy) without the range making much of a change (if you're within 2000m of the first shot). If you need to fire at a ship on a further line of the convoy, move down the chart in the same column a number of rows for that bearing. How many rows down to move directly equates to how far apart you think the lines of the convoy are (1 row for every 100m apart).
example:
you are approaching a convoy from it's port side. you fire at the lead ship on the nearest line of the convoy when he's in front of you. he was 2000m way. You can swivel right up to 20 degrees to fire at the next ship in that same line of ships without necesarily needing to input a new range. You then observe a ship on the next line out at 15 degrees. You estimate that convoys travel in lines 1000m apart. Go back to the 0 column in the chart and move down another 1000m from your original 2000m shot, and then go over to the 15 degree column to get it's range (3100m).
this is all right-triangle stuff, so is easily pre-computed. which i did using some code i wrote.