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Originally Posted by gurudennis
Range matters a whole lot from any angle because it is the most significant factor that determines the time to target, and therefore it factors into the amount of lead given. That is unless you are using fast 90 to fire (which you shouldn't, it's ineffective in comparison with the traditional method as described in the game manual). Of course, at close range, you can be wildly off and still hit, but I presume we're discussing medium-to-long range shots.
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No, the range is no factor in the amount (angle) of lead. As the target is further away, it to needs to move further along from when you hit the button to when it meets the torpedo. And the torpedo equally needs more time before it makes contact. The triangle of these distances is always in the same shape despite a difference in target range. And it is determined by the target speed, AOB and torpedo speed. Range cancels out of the equation for which lead angle you need.
Range only maters for a correction if the torpedo is steered away from your own bow (or stern for tube 5), to correct for the curve as the torpedo makes a turn. (the correction becomes larger the closer the impact will be) Set the TDC locked to the periscope/UZO, set a non-zero speed and non-zero AOB. Then point the periscope/UZO such that the gyro angle is 0. No amount of range setting will change the amount of lead or gyro angle. The angle between the optical targeting line and the torpedo course is constant. Change the AOB, or speed, or both. Then adjust the periscope/UZO direction to get the gyro-angle back to 0. Try to budge it with the range again. It won't.
The Fast 90 is a combination of a 0-gyro angle attack and the choice for being positioned perpendicular to the target course. The 0-gyro angle can be equally be effective (for canceling out range) if you are at any different angle to the target course. 45, 60 90, 120, it makes no difference. The benefit a 90 degree angle between torpedo trajectory and that of the target course is the margin of error to prevent a miss (broadside impact versus narrow aspect miss), or if implemented in the game-mechanics, the impact/collision geometry and dud chances. If the situation demands you to fire a torpedo to the target impacting with a 45 degree angle, the 0-gyro angle still works to cancel out range. Your margin of error for a hit is just 70% of a full broadside.
The range setting does affect the time to target calculation (and salvo angle), but that is a secondary feature to help determine when it is due. The torpedo would hit early or later eventually if range was set incorrectly with this 0-gyro angle setup. It would just come as a surprise. That is all.
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Try to get all the quantities (AOB, speed, range) with as much precision as possible. For speed and range it means one decimal point of precision on knots and centiradians respectively. Do bear in mind that the speed dial is bugged: you always need to enter more or less target speed minus 0.2 knots because your character looks at the TDC slightly from below. Hit me up for details.
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Good point. With 3d modeling of dials reading them introduces parallax-error. The perspective on the dial background behind the needle changes how you read it. Ideally you would read the dial when straight in front of it, but alas the WP viewpoint is fixed. Which also makes it easier to read as it is steady. Something to be aware of indeed.