Complicated Math

[robj250]

Okay guys, here is the problem. First of all the navmap is 125KM size which 125 km = 54 mm and the time of the day is 1816. I have a convoy 79° from me at a distance of 170 mm on the nav map, they are on a course of 247.5° and travelling at 6 kts. I anticipate they have to travel along that course (247.5°) for a distance of 134 mm on that nav map. What time would it be when they reach that 134 km point?

Next, I plan to intercept them on a bearing of 108°, the distance on the nav map is 45.5mm when they have travelled 134 mm on the nav map. What time would it be when I arrive at my point if I travel at 17 kts.

6 kts/24 hrs = 267 km
17 kts/24 hrs = 756 km

Can anyone solve this for me. My brain just cannot comprehend it

Have I supplied enough information?

[El Dude]

42

[VipertheSniper]

the 134mm on the map are approx. 310 km, your distance to the convoy is approx. 393km, the interception course is approx 105km long, you could as well run at 6kts and still intercept them, you being there earlier won't help you much in terms of light conditions, I'd rather go for a longer interception course where you reach the convoy earlier, because for 310 km they'll need about 27 hours, so you would attack them at about 2100... I think I'd go for a course that intercepts the convoys course at a bit more of an angle than the 139.5° you're going for, in 12 hours you'll make 378km at 17kts so I'd draw a circle around your boat in the nav map with 360 km radius, plot a line of the targets course and head in the direction of the intersection point. That should give you enough time to set up nicely.

I could've just written: "use the map tools" right?

[VipertheSniper]

Originally Posted by El Dude

42

LOL HHGTTG

[robj250]

Originally Posted by VipertheSniper

the 134mm on the map are approx. 310 km, your distance to the convoy is approx. 393km, the interception course is approx 105km long, you could as well run at 6kts and still intercept them, you being there earlier won't help you much in terms of light conditions, I'd rather go for a longer interception course where you reach the convoy earlier, because for 310 km they'll need about 27 hours, so you would attack them at about 2100... I think I'd go for a course that intercepts the convoys course at a bit more of an angle than the 139.5° you're going for, in 12 hours you'll make 378km at 17kts so I'd draw a circle around your boat in the nav map with 360 km radius, plot a line of the targets course and head in the direction of the intersection point. That should give you enough time to set up nicely.

I could've just written: "use the map tools" right?

I'm sorry, but I don't know how to use the map tools, that's why I have to try and figure it out by hand. But I'll take your suggestions. Thanks

[GreyOctober]

I hope it will clear some things for you. I made it to another scale (13.4 km). it more like a general example of how you should intercept.



http://www.hg-d.com/others/intercept.jpg

Cheers!

[robj250]

Originally Posted by GreyOctober

I hope it will clear some things for you. I made it to another scale (13.4 km). it more like a general example of how you should intercept.



http://www.hg-d.com/others/intercept.jpg

Cheers!

Actually GreyOctober, the positions are different, I'll see if I can get Imagewhatever to post the picture. Thanks

[GreyOctober]

The possitions might be different but infact the same rules apply when it comes to interception.

[robj250]

I am actually heading toward AE87 when I was informed of this large convoy on a course of 247.5° at 6 kts.

http://img138.imageshack.us/img138/7...irroute0wj.jpg

[robj250]

Originally Posted by robj250

I am actually heading toward AE87 when I was informed of this large convoy on a course of 247.5° at 6 kts.

There, I got it bigger in the above post. Thanks
Now if you can relate you explanation to my map then I would understand it better.

[zzsteven]

The link worked Robert.

zz

[GreyOctober]

btw, to display an immage put the link in between

[img]  [/img]

tags

[img]http://img138.imageshack.us/img138/5388/theirroute7ld.th.jpg[/img]

or select the link (as you select a normal text) and click the "IMG" button (third from the right just below the Subject textfield) in the message composer

[robj250]

Originally Posted by GreyOctober

btw, to display an immage put the link in between

[img]  [/img]

tags

[img]http://img138.imageshack.us/img138/5388/theirroute7ld.th.jpg[/img]

or select the link (as you select a normal text) and click the "IMG" button (third from the right just below the Subject textfield) in the message composer

I've printed out your map to see if I can "comprehend it" You know how difficult it is for me to understand things sometimes

Darn Now I forget how to get my signature picture back in so that a person can link on it to see the fate of U51

[robj250]

This is the code I have in my signature:

GOOD HUNTING FOR EVERYONE! Go get 'em!
[img]
http://img124.imageshack.us/img124/8625/viibuboateditblue22ln9ar.jpg[/img]
Thanks to everyone who have given me help and good recommendations, it is greatly appreciated.

This is what I have in the signature: {color = green} Good hunting --- {/ color}
{url=http://www.boat.net/boats/u51.htm/}{img}
http://img124.imageshack.us/img124/8625/viibuboateditblue22ln9ar.jpg{/img}{/url}
{color=red}Thansk -----{/color}

The { would actualy be a [ etc. Whats wrong, because my image picture is not showing?

What's wrong with it GreyOctober?

[robj250]

Originally Posted by VipertheSniper

the 134mm on the map are approx. 310 km, your distance to the convoy is approx. 393km, the interception course is approx 105km long, you could as well run at 6kts and still intercept them, you being there earlier won't help you much in terms of light conditions, I'd rather go for a longer interception course where you reach the convoy earlier, because for 310 km they'll need about 27 hours, so you would attack them at about 2100... I think I'd go for a course that intercepts the convoys course at a bit more of an angle than the 139.5° you're going for, in 12 hours you'll make 378km at 17kts so I'd draw a circle around your boat in the nav map with 360 km radius, plot a line of the targets course and head in the direction of the intersection point. That should give you enough time to set up nicely.

I could've just written: "use the map tools" right?

Thanks VipertheSniper. I took your advice, but I did it the "eyeball" method. I went on a course of 139° and I intercepted them July 25 at 0129. So far I have sunk 2 destroyers and 2 merchants. Not finished yet as I have lots of torpedoes left. Thanks again. I really appreciated your advise even though I don't know how to use the "tools"