When your normal cruising mode at ahead slow, both engines are spinning i think like 100 or 200 RPMs each. Lets be generous and say 200 RPMs, each engine.

WHen in recharge mode, one engine is taken off propulsion and put to recharging the batteries. By default it goes to 500 RPMs for as long as it take to recharge your batts. The other engine remains on purpulsion. What this means is if your noramlly doing 8ish kts with no recharge, your now putting about doing say 4 or 5 kts.

Personnaly, i dont increase speed just to stay at a cruising speed of 8 kts on the surface. For 3 hours a day, i'll be moving about at 4 or 5 kts instead.

Totally wrong!

You are forgetting about "load".

Running at 300rpm with out charging the batteries is not the same as running at 300rpm charging the batteries.

This is because charging the batteries puts load on the engine. The higher the load, the more energy is required to maintain the RPM.

Like when you drive a car up hill. The wheels turn at the same speed as they do on flat ground, but you need to give it more throttle because the load is greater. More throttle means more fuel is used.

LOL you dont have to believe me Letum, i have no stake in being believed to be correct or not.

Go search for the "NASA battery fix" by von Helshing to get the info behind it. THe problem is battery moddeling in this game is screwed one way or the other.

By default, stock settings, you rarely saw your battery drained, at least, not very far. Which was highly unrealistc. You could dash about at flank speed for a number of hours longer then you should have been able to. Battery capacity played little or no part in your decision making or the game at all for that matter.

At least with the battery fix in place, battery capacity comes back into play. You can acutally drain the bugger in about a couple hours if you ran at flank speed during that time. You have to watch what you do, particuarlly in heavily patroled areas where being on the surface is.. less then desirable. The downside is it recharges unrealistically fast. If it took 8+ hours to recharge like its supposed to, then i probably woudlnt be sitting here telling you all this ;)

edit:
BTW Letum, im talking about how SH3 works, not real world physics. SH3 doesnt exactly follow all laws of physics.

I don't know how simple I can make this.

You cant get energy out of nowhere.

If a disel motor used 1 unit of energy to go 1 mile that means a electric motor also uses 1 unit of energy to go one mile because it is useing the same screw to move the same boat.

When the diesel motor uses 1 unit of energy it uses 1 unit of fuel.
When the e-motor uses 1 unit of energy it uses 1 unit of battery power.

Then 1 unit of battry power needs to be replaced when the battrys are charged.
If battery chargeing efficany was 100% then it would take 1 unit of energy to charge it.
The disel motor can give the battry 1 unit of energy. We allredy know that When the diesel motor uses 1 unit of energy it uses 1 unit of fuel.
So at 100% battery chargeing efficancy it takes 1 unit of fuel to charge 1 unit of battery power.
However battery chargeing efficany is less than 100% so more than 1 unit of fuel is needed to charge 1 unit of battery power.

Stock SH3 works this way. Any mod that changes it is VERY unrealistic. Exploiting this is also Very unrealistic.

How does this work?

I asked my navigator "Range at current speed" while doing 7kt = 22,000
"Range at current speed" while doing 9kt = 15,000

How are you getting 33,000?

I'm using the first IXC of the block with only the first available upgrades, are you using a latter better upgraded ship?

What engine upgrades are you both useing?

Range readout your navigator gives you will vary on weather. Rough weather on the surface will slow you down, and give you a lower total range number. Clear weather will inflate the number he gives you.

Im running the first engine upgrade, and thus far have only gone across in summer, which has helped. I've tended to head down to the equator and then go straight across, and have had literally weeks at a time of sunshine and next to no wind. ahh the doldrums:rock:

I agree with Ducimus... the way the battery reload works, it basically takes one engine off from propulsion of the sub to action the alternator reloading (you can see the right shaft is not turning). I don't see why this engine would use more fuel running the recharge compared to actioning the screw shaft.
Of course if you want to maintain the same speed with one engine instead of two, then you have to have them run faster and use more fuel. But there is nothing that says that you have to. I just run slower on one engine while recharging for a few hours, nothing to hurry about.

http://www.subsim.com/radioroom/show...8&postcount=19

Either you didn't read this or you didn't understand it. Unless SH3s maths is wrong there is no way I can be incorrect.
I don't mean to sound arrogant, but its just fact!

I spent quite some time on boats and a diesel running at a set rpm will use the same fuel quantity, whatever you use the output power for... (what you do with the power it generates is not the problem of the engine, it just generates power)

Gonna keep this in the other post
http://www.subsim.com/radioroom/show...483#post369483

:lol: :up:
:damn: :rotfl:

Touche? ;)

Wow this thread went OT.