The only bow or angle you should be worried about when doing this trick is that of your own! Have the periscope look at 0 or 180 degrees, turn until right in front of his bow and then all is good.
p.s. If you used 1.852 as conversion factor instead of 1.94...yada yada yada... then your lead will be underestimated by 5%, or about one in twenty degrees too less. If you used simply 2 you'd have over-estimated the speed by 3%. That's better and simpler.
If this is a hit or miss really depends on the size of the target and the range. 1 degree is 17.5 meters wide at 1km. So most small vessels (78.5 meters is common) are between 4 and 5 degrees wide at 1 km distance. When closer disproportionally bigger in degrees. You'll no doubt hit it, but maybe not where you intended.
|