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View Full Version : Mr. Dietz's Convoy Battle


Reinhard Dietz
03-24-10, 09:31 PM
So I'm headed to BF 19 in trusty ol' U-48 when a convoy is sighted by someone else, but she's close, less than a day's sailing even at non-flank speed. Yee haw.

It's an inbound convoy at 6 knots, so I plot that out on the map and start doing the math. If I ran at flank speed throughout the rest of the night and the morning, I'd intercept the thing in time to see the sun rise. Given pre-war U-boat doctrine, that's not going to happen. So, I need to find them after nightfall on the second day, and I adjust my plotting accordingly. I race off to the planned intercept point and begin the wait.

As luck would have it, my sonar man (who's really going to get a medal for this) hears them at 0914 on the second day with upgraded hydrophones. If another very recent post is right, that means they're 20-30 kilometers away; if they're still making 6 knots, they'll be here in 3-5 hours, i.e. midday. That ain't good. My math was right so my estimated original position must have been off.

My plan of attack is simple: Once I find the new intercept point, i.e. where the convoy will be after dark, I'll go for that escort first (along with any friends) and then wreak havoc with deck gun (assuming the weather's constant; the seas are smooth as glass at the moment) and torpedoes while surfaced, per doctrine. Whether the moon's out or not is going to be irrelevant; it's the first convoy I've seen near me in this career and I figure that my Escorts Die First policy ("Honestly, herr Admiral, the escort swerved into the path of my torpedo!") will get the job done and U-48's second patrol will match or exceed her first of 27,000 GRT.

Here's my question: Assuming that they're still at six knots, should I just run on the surface at five or six knots in the same direction (checking with hydrophones every so often) and then pull to a stop so that they close the distance after nightfall and then surface to attack? If not, what should I be doing here?

I'm very rusty on engaging anything other than single targets, and my recent time in SHIV doesn't necessarily translate, I don't think. In other words, presume I don't know much.

NB: I'm GMT+1 as I understand it, and the date is 19 NOV 1939, so keep that in mind; didn't write down where I was. I've got to figure out when nightfall in this area is, too. Anyone got an idea? I'm running stock SHIII, for what it's worth.

Snestorm
03-25-10, 03:35 AM
The only way I can think of to do it, without being stuck in TCx1 is:
Get a visual on the convoy.
Dive.
Follow with hydrophone until contact is lost.
(Usualy 2 Hours at TCx64 will do).
Surface.
Catch up.
Repeat as neccesary.
(It can still be quite time consuming).

Note on using Flank Speed:
This should only be used for VERY brief periods, for an emergency.
It's the equivalent of climbing in your UNGOVERNED car, and holding the throttle to the floor.
You may get away with it for a minute or two, but sooner or later after that you will eventualy hear B A N G, as your engine blows.
Full Speed is the fastest your engines are designed to run.
(The speed gained by using Flank is usualy not more than 1 Knot anyway.
And it sucks up the fuel, big time.)
A Steam Turbine powered warship can get away with this with comparrative ease, as compared tp our Diesel Powered uboats.

Didd
03-25-10, 09:29 AM
Here's what I do during the day (not that I know anything). Edge in towards convoy until you can get a visual range and bearing. Plot on chart along with elongated line in direction of travel. Retreat back outside visual range and steam ahead of convoy. Check every 2 hours on hydrophone and plot direction of contact on chart. where it crosses elongated line above is convoy position (approx. typical convoy covers several Kms). Knowing the speed of convoy you can check distance travelled in those two hours. If this doesn't tally reasonably well with what you've plotted, the convoy has changed course. Rinse and repeat 'till nightfall. I try to keep convoy at my 4 or 8 o'clock roughly so I am well set for an attack soon after dark.

It's simpler than it sounds.