[TorpX]

Originally Posted by steinbeck

On my 1st patrol to Bashi Channel.



What is wrong ? I cannot see any of the mods causing this! Or do I get back with fumes in the tanks?

You didn't say what class of boat you have.

If it is a Porpoise, I would pick a patrol zone closer to you.

The Porpoise had a range specification of 6,000 nm @ 10 kn. It's successors had 11,000 @ 10 kn.

In any case, these are the optimum speeds of the boats:

About fuel consumption in transit: I found fleet boats got the best mileage at ~9 knots, the S-class at ~6 or 6½. Remember, it is the engine speed, not the telegraph setting, that is important. This was with ISP, mods with different engine values may be different. Economical speed is ~3 kn. submerged.

Fleetboats use fuel while sitting still on the surface idling. I found the fuel burned was equivalent to going 9 kn. or so. This seemed outrageous to me, so I put a workaround for this in ISP. Then, you could lay to, and save fuel while you waited for a contact to show up. S-class boats don't burn fuel, at all stop.

Obviously, recharging batteries consumes fuel.

At one time it was 'ahead standard' the most efficient speed for cruise.

This certainly isn't true with ISP, and I don't know where this idea came from, tbh. It really doesn't make sense. Best mileage will be at one engine speed, which is 'Ahead 1/3' in ISP. The game doesn't care about telegraph settings; you could make 1/3 100% of your max. speed, if you wanted, but it doesn't change your mileage. 9 knots will still get you farther, whether you call it 1/3 or something else. To put it another way, the engine telegraph settings are a matter of convenience. They don't change the engine workings.

I think people have confused the idea of 'best speed', meaning best mileage, and 'best speed' being the fastest speed, that permits reaching your goal, and fulfilling your mission.