Test Dive advice?

Originally Posted by jimbuna

Possibly needed another knot or two but the boat will eventually reach a point where you feel there is an invisible force sucking you down...at least in GWX it did.

Heck Ive had that happen way before 260. Ive had it happen to me at 200m where if I dont keep at least 1 or 2 knots, I start to sink ever so slowly.

[King_Zog]

Originally Posted by USNSRCaseySmith

Heck Ive had that happen way before 260. Ive had it happen to me at 200m where if I dont keep at least 1 or 2 knots, I start to sink ever so slowly.

Yes me too, although I don't always sink, sometimes the boat wants to go up rather than down. But this is more realistic no? I was under the impression that U-Boats could not hover at a certain depth and need a certain amount of forward motion to maintain depth. Although I can still hover at periscope depth while stopped with no problems, although that's fine by me.

Originally Posted by King_Zog

Yes me too, although I don't always sink, sometimes the boat wants to go up rather than down. But this is more realistic no? I was under the impression that U-Boats could not hover at a certain depth and need a certain amount of forward motion to maintain depth. Although I can still hover at periscope depth while stopped with no problems, although that's fine by me.

Well like he said it depends on your depth. The boat needs a positive bouyancy (Sp??) to float up and a negative one to float downward. At a certain depth mathematically there is no way that the boat could achieve even a neutral bouyancy to maintain depth, so all it will do without momentum is sink. The way I see it is each depth has a certain amount of bouyancy required to overcome it, more being required the further down you go because of the weight of all of the water on top of you. At least thats how it makes sense in my mind. If anyone really knows why please do prove me wrong, I don't mind learning a new thing or two

[King_Zog]

Yeah, that makes perfect sense.

But I still doubt that a world war 2 era submarine would be able to hover at any depth. Without computerised aids to constantly monitor the boat's trim and accurately regulate the boat's ballast tanks I would think they would be constantly either rising or falling without forward motion. But perhaps I am underestimating the capabilites of a pre-computer dependant society.

[Gerald]

She can handle 270.

[Jimbuna]

Originally Posted by King_Zog

Yeah, that makes perfect sense.

But I still doubt that a world war 2 era submarine would be able to hover at any depth. Without computerised aids to constantly monitor the boat's trim and accurately regulate the boat's ballast tanks I would think they would be constantly either rising or falling without forward motion. But perhaps I am underestimating the capabilites of a pre-computer dependant society.

Then read #38, 43, 44 and 45.

Originally Posted by jimbuna

Then read #38, 43, 44 and 45.

So does this mean my explanation was actually somewhat right?? Heck I was just guessing on it really.

[Jimbuna]

Originally Posted by USNSRCaseySmith

So does this mean my explanation was actually somewhat right?? Heck I was just guessing on it really.

More or less...technology during WWII wasn't advanced enough to easily allow a submersible to 'hover'.

I'm not saying it couldn't be done but simply that it extremely difficult, especially when motionless.