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I was wondering if this was working ok and I made a simple and quick test, which brought me a strange results. Please take a look.
I created a new scenarion, inserted 3 units=S61Delfin Submarine along north/south axis.
Then I selected topmost and selected CREEP (3knots) SHALLOW
Then the middle and I inputed 4 knots manually again SHALLOW
Finally the south one I selected CRUISE (5 knots) and SHALLOW

I ploted a course bearing 90 (east) for all.

With the simulation STOPED I checked the ENDURANCE field bellow UNIT FUEL
For CREEP it gave me 250nm OR 3 days and 11 hours
For CRUISE it gave me 104nm OR 20:48
AND for the manually inputed 4knots it gave me 83nm and 20:48 (yes it is strange, yes I double checked AND double simulated)

So how could I end up with LESS distance traveled and same time endurance with diferent speed sets (4knots and 5 knots)
This is not only with subs, airplanes also fail to better calculate this fuel endurance and consume too.
I made a coarse calculations just taking in consideration average numbers, 4 knots should have made 42 hours OR 155nm, but even if performace is not linear, I guess performace for 4 knots is not LESS then for 5 knots. Right?

I also made tests with FLANK SPEED (15knots) 14 and 13 and they all gave me the same time endurance, but about 1nm LESS and 2nm LESS respectivelly.

I guess this is not su much a problem with aircrafts but with some slow vessels like subs, this is a problem and for such a great simulator, this bug is a shame, I mean it is soo precise in soo many aspects and this one is off.

Anyway I respect a lot the work of the CMANO Staff, I just would like that you take a look in this.

Thanks

Thanks for taking the time to do this. We'll definitely take a look!

Mike

Thanks Mike you are welcome and if CMANO staff want me to do any test, just let me know, I am unemployed and soo have a lot of time at hands.