Fangschuss said:
Quote:
but how to calculate enmey ship speed when moving :hmm: like i now we have to stop, to calculate the speed ... ok i give it a try 
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I guess most everyone goes to Wazoo's sticky in the beginning of the posts; however, you can calculate the target's speed without using the 3:15 min. rule and plotting ranges etc.
Here's how it's done:
Own speed : sin Target's AoB : : Target's speed : sin Target's Bearing
yep, its accomplished using ratio and proportion...multiply the extremes, then divide by the means.
First: After sighting target (with UZO or scope), adjust your course and speed to get into a
COLLISION COURSE, this occurs when the target stays at the same bearing and doesn't move. You would eventually collide with the target if either of you kept on your present courses and maintained your present speeds.
Second: Determine the Target's AoB and Bearing.
Third: Plug the data into the ratio and proportion formula.
example:
My speed = 3 kn.
Target's AoB = 25° Red
Target's Bearing = 070°Relative
3 kn : sin 25° : : ______ : sin 070°
3 x sin 070° / sin 25° = 6.67 kn.
edit: (aka the law of sines)
If you have and use a circular sliderule, it's extremely easy, but, works quite well with an electronic calc also.
cheers,