Does anyone have an equation to calulate travel time?

Pisces · 07-28-08, 07:13 AM

Quote:

Originally Posted by joegrundman

Quote:

Originally Posted by Flamingboat

I can get their speed and course no problem. It's the intercept. Right now I have a convoy near the Philipines. They are 16 NM away and heading SW. I don't want to just point at them and hit the gas. I want to head SW as well closing the gap. If I can figure out how long it will take them to reach a certain point I can compare it with mine. That way I know if my speed and coarse is the best way to catch up to them. I have to be spart since they have a decent lead so that is where the math comes in.

So knots is nautical miles per hour?

yes

mathematically precise intercepts

http://www.subsim.com/radioroom/showthread.php?t=88961

(excitedly points to that link)

To make sure I do not miss him or have to sprint ahead of him after making visual contact I first project his current position along his course based on the time since the contact report appeared, and estimated speed. Then I extend this with 16km (=max visual range in sh3, use whatever feels good in SH4) by using a circle to build-in my advance position. And only then do I start drawing the sub-contact leg against that circle to make dantenoc's intercept triangle. All the while I assume he's going by the highest speed of that speed-range. And i adjust/recalculate my intercept if the weather slows me down enroute.

Once you make visual or hydrophone (most likely) contact with it, draw that direction the map (10-20 NM, I don't know the limits of SH4 visual/sonar range). Then measure the distance from the old contactreport (old by now.. you did mark it, did you?) upto that visual/hydro bearing line and divide by the time since the old contact report was issued. Measure this with a circle tool so you can see where it touches the line. That would indicate the minimum (average) speed of the contact but also measure upto the furthest end of the bearingline and upto your sub. This can get you a pretty accurate estimate on the speed of the contact.