Why does the crash dive go to ~70m?

Stiebler · 06-17-09, 05:12 AM

Owing to a small bug in the original game, any attempt to alter the pre-set crash-dive depth, before the crash-dive has completed, results in the U-boat not levelling out properly.

This can affect depth-keeping properties - you may find you have to travel excessively fast to hold your depth steady.

This problem is particularly severe with the NYGM super-mod, where the U-boat is trimmed down anyway (that is, it has a tendency to keep sinking at very slow speed), but it also affects the stock game. Not sure about GWX, since the U-boat is trimmed up (has a tendency to rise) at very slow underwater speeds.

The golden rule: Do NOT change the depth of a crash-dive until AFTER the crash-dive has completed. As an alternative, just diving at flank speed and also pressing the 'D' key is nearly always fast enough, and does not cause the crash-dive depth-keeping problem.

If you accidently interrupt a crash-dive by changing depth, you can correct all the problems by returning to a depth above the crash-dive depth, then crash-dive again, allowing the U-boat to level out properly.

Stiebler.

nikbear · 06-17-09, 06:56 AM

Or you could use Venatore's mod for pre-setting your Crashdive depth,much easier and very useful around the shallow coast of GB

http://www.bts-mods.com/?page=sh3user=venatore Its JSGME enabled and gives you a number of depth's to choose from,brilliant little mod

Jimbuna · 06-17-09, 07:11 AM

Quote:

Originally Posted by nikbear

Or you could use Venatore's mod for pre-setting your Crashdive depth,much easier and very useful around the shallow coast of GB

http://www.bts-mods.com/?page=sh3user=venatore Its JSGME enabled and gives you a number of depth's to choose from,brilliant little mod

Quite agree....a great mod that covers 20, 30, 40, 50 and 60 metre depths.

If anyone should feel the need for a different depth, say....35 metres (and I can't imagine why the above options shouldn't give choice enough) simply go into data\submarine\NSS_'uboat type' open the CFG file and change the MaxDepth figure.

Edit: Humble apologies I meant to type CrashDepth

Sailor Steve · 06-17-09, 02:58 PM

Answer to the original question: When you conduct a normal dive the tanks are flooded and the sub is taken down. American practice was to dive to 100 feet and then come back up to periscope depth once proper trim was assured. I'm betting German practice was the same, so "Periscope Depth" is not realistic from the surface, nor is "Decks Awash".

In an emergency 'crash' dive, everything is flooded, the boat is taken to flank speed and the planes are put on full down. Several hundred tons of steel is hard to stop once it gets going downward, so 70 meters is, as I understand it, the depth they really did pull out of.

If you want to go to 20 meters, click "20" on the dial and order flank speed. You should get there faster. If not, blame the game.

Shrike37 · 06-17-09, 07:03 PM

Quote:

Originally Posted by Sailor Steve

Answer to the original question: When you conduct a normal dive the tanks are flooded and the sub is taken down. American practice was to dive to 100 feet and then come back up to periscope depth once proper trim was assured. I'm betting German practice was the same, so "Periscope Depth" is not realistic from the surface, nor is "Decks Awash".

In an emergency 'crash' dive, everything is flooded, the boat is taken to flank speed and the planes are put on full down. Several hundred tons of steel is hard to stop once it gets going downward, so 70 meters is, as I understand it, the depth they really did pull out of.

If you want to go to 20 meters, click "20" on the dial and order flank speed. You should get there faster. If not, blame the game.

I tried just going to 20m on flank vs a crash dive a couple days ago. The crash dive reached 20m about 20 or so seconds faster than going to flank and diving to 20m. While driving a VIIB.

Task Force · 06-17-09, 07:11 PM

you can press c then acouple of seconds later p.

meduza · 06-17-09, 07:15 PM

Quote:

Originally Posted by Shrike37

I tried just going to 20m on flank vs a crash dive a couple days ago. The crash dive reached 20m about 20 or so seconds faster than going to flank and diving to 20m. While driving a VIIB.

That's understandable, because at crash dive you pass 20m with maximal speed and planes set for diving.
But if you order to dive to 20m, when you get near that depth, the sub will considerably slow its descend. That's why it takes longer.

Try setting some other depth, then see how long will it take to reach 20m. I tested it for 15m, with VIIC. Crash dive took 36s, normal dive at flank speed 39s. Before diving, I was going at 10kt in all tests.

Sailor Steve · 06-18-09, 11:16 AM

Quote:

Originally Posted by Shrike37

I tried just going to 20m on flank vs a crash dive a couple days ago. The crash dive reached 20m about 20 or so seconds faster than going to flank and diving to 20m. While driving a VIIB.

But that was my point. It's realistic that way.

Steeltrap · 06-18-09, 08:42 PM

As Jimbuna pointed out, the easiest solution is to edit the CrashDepth in the sub file.

I used to amend mine to 25m.

Peter Cremer in U333 said the test in the baltic was to get to 20-25m in around 25 seconds.

As has also been stated, DO NOT interrupt crash dive until it has finished i.e. levelled out at the pre-set depth (default 70m). Doing so can have some screwy effects.

06-17-09, 05:12 AM	#1
Stiebler Fuel Supplier Join Date: Oct 2005 Location: London, UK Posts: 1,237 Downloads: 29 Uploads: 4	Owing to a small bug in the original game, any attempt to alter the pre-set crash-dive depth, before the crash-dive has completed, results in the U-boat not levelling out properly. This can affect depth-keeping properties - you may find you have to travel excessively fast to hold your depth steady. This problem is particularly severe with the NYGM super-mod, where the U-boat is trimmed down anyway (that is, it has a tendency to keep sinking at very slow speed), but it also affects the stock game. Not sure about GWX, since the U-boat is trimmed up (has a tendency to rise) at very slow underwater speeds. The golden rule: Do NOT change the depth of a crash-dive until AFTER the crash-dive has completed. As an alternative, just diving at flank speed and also pressing the 'D' key is nearly always fast enough, and does not cause the crash-dive depth-keeping problem. If you accidently interrupt a crash-dive by changing depth, you can correct all the problems by returning to a depth above the crash-dive depth, then crash-dive again, allowing the U-boat to level out properly. Stiebler. __________________ NYGM Tonnage War Mod - More than a mod: it's an experience!

06-17-09, 06:56 AM	#2
nikbear Sea Lord Join Date: Feb 2007 Location: Northampton,UK Posts: 1,859 Downloads: 86 Uploads: 0	Or you could use Venatore's mod for pre-setting your Crashdive depth,much easier and very useful around the shallow coast of GB http://www.bts-mods.com/?page=sh3user=venatore Its JSGME enabled and gives you a number of depth's to choose from,brilliant little mod __________________ 'It is not surely known when the grey wolf shall come upon the seat of the gods' Ericksmal.

06-17-09, 02:58 PM	#4
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	Answer to the original question: When you conduct a normal dive the tanks are flooded and the sub is taken down. American practice was to dive to 100 feet and then come back up to periscope depth once proper trim was assured. I'm betting German practice was the same, so "Periscope Depth" is not realistic from the surface, nor is "Decks Awash". In an emergency 'crash' dive, everything is flooded, the boat is taken to flank speed and the planes are put on full down. Several hundred tons of steel is hard to stop once it gets going downward, so 70 meters is, as I understand it, the depth they really did pull out of. If you want to go to 20 meters, click "20" on the dial and order flank speed. You should get there faster. If not, blame the game. __________________ “Never do anything you can't take back.” —Rocky Russo

06-17-09, 07:11 PM	#6
Task Force Rear Admiral Join Date: Jul 2008 Location: SPACE!!!! Posts: 10,142 Downloads: 85 Uploads: 0	you can press c then acouple of seconds later p. __________________ Task Force industries "Taking control of the world, one mind at a time"

06-18-09, 08:42 PM	#9
Steeltrap Grey Wolf Join Date: Mar 2001 Location: Sydney, Australia Posts: 818 Downloads: 3 Uploads: 0	As Jimbuna pointed out, the easiest solution is to edit the CrashDepth in the sub file. I used to amend mine to 25m. Peter Cremer in U333 said the test in the baltic was to get to 20-25m in around 25 seconds. As has also been stated, DO NOT interrupt crash dive until it has finished i.e. levelled out at the pre-set depth (default 70m). Doing so can have some screwy effects.