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Originally Posted by Joe S
Jazman,
If you are having problems with manual tdc it is NOT because of the range estimation. It is more likely error in the speed estimation. a small error in speed estimation will result in a miss except at extemely close range. If you want to improve the stadimeter range finding method, determine the height of the smokestack, which is easier to see than the top of the mast. The top of the mast often dissappears making it impossible to get an accurate fix. If you use the smokestack heigh you should see a big improvement. Joe
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OK, I spent some time working out the trig on a non-90 AoB solution. If we know the AOB, and the target speed, and the torpedo speed, and the range, there are two unknowns to solve: the time of the run, and the gyro angle. We need two equations. The ones that come to mind are the law of sines and the law of cosines. The law of cosines, unfortunately, seems to depend on the range. If the range is an unknown we're hosed because we need a third equation, am I missing something? Surely there are computational methods to solving this? That would be why you need a _computer_, right?
For the 90-deg AoB, the time of the run is an unknown, but cancels out nicely, and you need only one equation, because only the gyro angle is unknown. A basic trig equation works.