[WIP] s-class mod

im going to try and do an s-class mod so that they will get more realistic fuel ranges and battery life.

i know there are issues with the s-class but i figured i would look to see if i can get lucky and figure out something to make them better.

one of the things i wanted to look at first is to understand how the s-boats fuel ranges work and what i can do about them.

i know the best optimum fuel economy for the fleetboats is 9.5 kts but what about the s-boats?

s-boats are smaller, slower and dont travel as fast so i assume they must have a different optimum fuel economy speed so can anyone tell me what that might be?

[VonHesse]

Pretty sure I read somewhere on here that it was 10.9 knots. Could be wrong, but it does seem to work for me. BTW, doesn't one of the supermods include a "range at current speed" button? TMO? Maybe RFB? Can't remember, but I know I've seen one somewhere. You could use that to find out, maybe.

Gonna keep an eye on this one, I'd like to know for sure too.

[ETR3(SS)]

Post I made here http://www.subsim.com/radioroom/show...7&postcount=19 is for stock s-boats.

[VonHesse]

O.K. SUBSIM, in recognition of all the time and effort that WEBSTER and everyone else here has expended on behaf of noobs like myself, I have decided that it's high time that I find a way to give something back. I picked this particular challenge for several reasons: S-Boats rule, mods rule(who knew?), and SUBSIM rules them all. More specifically, though, because it fit into my own unique computer skill-set (modders read: skill-set=NULL). And so without further adoo:

My Method:
-disable all mods, verify stock with JSGME snapshot
-start new career, 1942, S-18, Brisbane(to run in friendly waters)
-enable limited fuel, start outside harbor
- mark start position w/max zoom, plot due East to South America and back, mark turn-around point
-save game
-return, use knotmeter to set speed as close to 1.5 knots as possible
-follow course,max TC, wait, wait, wait, wait, etc...
-consider out of gas when crew says so with 4% left
-measure from mark to mark(again, max zoom), add return trip when necessary
-record distance, load save game and repeat repeatedly, i.e 2.5 knots, 3.5 knots, 4.5 knots, etc, etc

My Madness(Findings):
1.5 knots = 4,439.7 nm
2.5 knots = 7,399.6 nm
3.5 knots = 10,919.4 nm
4.5 knots = 13,687.1 nm
5.5 knots = 16,863.0 nm
6.5 knots = 15,728.3 nm
7.5 knots = 11,723.6 nm
8.5 knots = 9,511.1 nm
9.5 knots = 7,950.4 nm
10.5 knots = 6,477.6 nm
11.5 knots = 5,651.0 nm
12.5 knots = 4,706.2 nm
13.5 knots = 4,277.0 nm
* for once, I'm thankful that that's as fast as she goes...

Note: I do hearby swear, on pain of banishment, that these statements and findings are true, honest, and accurate to the best of my ability. I've no interest in misleading this fine community.

Glad to finally be able to contribute, cheers,......"-snap-"(sound of one's arm breaking from patting oneself on the back whilst falling into a boredom induced coma)...

that looks great thanks, but it only shows half knots.

from the list 5.5 knots = 16,863.0 nm is the best fuel economy but i am left to wonder if 5 or 6 kts might be better or worse than 5.5 kts

can you check those two? (5.0 and 6.0 kts)

Originally Posted by ETR3(SS)

Post I made here http://www.subsim.com/radioroom/show...7&postcount=19 is for stock s-boats.

if what VonHesse shows is correct then the numbers you are giving is not looking like the best fuel economy for s-boats so i must ask how you came to use these numbers and how certain are you these numbers you gave (9.5kts surfaced, 5kts submerged) are really correct?

[VonHesse]

Can do Sir. I'll refine the numbers when I get home from work. I set it at X.5 because when you set it directly on a number(3, for example) the crew replies with the next number down ( in this case "aye Sir, set speed 2 knots). I wasn't sure who to trust, the crew, or the dial. Anyways, I'll be back with those numbers this afternoon.

yea im pretty sure the game uses the wrong sound files but you can never be 100% certain

i dont think anyone ever bothered to do a mod to correct it or maybe its coded in

[ETR3(SS)]

Originally Posted by WEBSTER

if what VonHesse shows is correct then the numbers you are giving is not looking like the best fuel economy for s-boats so i must ask how you came to use these numbers and how certain are you these numbers you gave (9.5kts surfaced, 5kts submerged) are really correct?

I took them directly from the sim file. I also assumed that our little s-boat would have the same confounding fuel efficiency problem that the other boats have at speeds less than 10kts. These new numbers may indeed be accurate, the s boat may not suffer from the same coding problem of the fleet boats.

well the fleet boats get the best fuel economy at roughly 50% (just below it actually) of the full speed so fleet boats get full speed of 20kts and the best fuel economy is at 9-9.5kts which is something like 47% of top speed.


i was expecting the s-boats to be about the same level of percentage (half of full speed) but i would not expect to see them use the same numbers as fleetboats because s-boats have top speed of only 13 kts stock or 14.5 if modded

a 9.5 kt speed is like 80% of the full speed which is ahead full setting for an s-boat

[epower]

In the individual submarine cfg files there are percentages associated with each throttle setting. If memory serves 0.45 is the most fuel efficient setting. I think most "Ahead standard" settings are 0.48 or so on Fleet boats.

For S-Boats "ahead 1/3" is often closer to the ideal 0.45. It's easy enough to assign 0.45 to a throttle setting.

Data/ Submarine/ NSS_Subname

Here's the link to the post of my fuel consumption test results in case you're interested.

http://www.subsim.com/radioroom/show...ghlight=epower

The real surprise was that fuel consumption is a constant from 0-0.45% throttle then rises significantly.

<S>

epower

[VonHesse]

@ WEBSTER - Quote: "that looks great thanks, but it only shows half knots." ......oh, sweet irony...

O.k. ran the set-up over again using the same save point, same procedures, accurate as possible. Additionally, I double checked some of my earlier numbers by bracketing 5 & 6 knots. Here's what I got this time:

4.5 knots = 13,668.8 nm
5.0 knots = 15,590.3 nm
5.5 knots = 16,960.3 nm
6.0 knots = 17,718.9 nm
6.5 knots = 15,644.9 nm

note: None of the numbers were exactly the same. I have no explaination for this, but it never exceeded +/- 0.5%. Chalk it up to human error, or the devil/angel Ubisoft, as you please.

And so, reminding me strangely of my days in the Army, after long hours -days even - of pouring over charts, plotting courses, and double checking calculations, I can firmly state with full confidence:

"Six, Sir. The answer is six."

Originally Posted by epower

In the individual submarine cfg files there are percentages associated with each throttle setting. If memory serves 0.45 is the most fuel efficient setting. I think most "Ahead standard" settings are 0.48 or so on Fleet boats.

For S-Boats "ahead 1/3" is often closer to the ideal 0.45. It's easy enough to assign 0.45 to a throttle setting.

Data/ Submarine/ NSS_Subname

Here's the link to the post of my fuel consumption test results in case you're interested.

http://www.subsim.com/radioroom/show...ghlight=epower

The real surprise was that fuel consumption is a constant from 0-0.45% throttle then rises significantly.

<S>

epower

many thanks for the info and i am not questioning the fuel for fleet boats as we all agree and there is ample evidence to support that the best fuel economy for "fleetboats" is a speed of 9-9.5 kts or power ratio of 45-48%


the thing that doesnt seam to have "ever" been tested is to confirm the s-boats or s-class subs also have the best fuel economy at this same 45-48% range.


because the s-boats have different top speeds they will certainly have a different speed setting for max efficiency and from the data provided by VonHesse it seams they do indeed have a different "sweet spot" of best fuel economy and this looks to be right in line with that 45-48% range you and others have found.


i am agreeing with you i think that that sweet spot will be the same 45-48% range but im waiting on VonHesse to get those numbers posted when he gets a chance. the reason is just like the strange pattern you saw with fleetboats i want to be sure there is no strange numbers seen that show a possible different pattern of fuel use for s-boats


i am hoping you can confirm what is the true number for fleet boats, is is 9 kts or 9.5 kts that gives the best fleetboat fuel economy? or is it more accurate to just use the 45% number as the setting?

Originally Posted by VonHesse

@ WEBSTER - Quote: "that looks great thanks, but it only shows half knots." ......oh, sweet irony...

O.k. ran the set-up over again using the same save point, same procedures, accurate as possible. Additionally, I double checked some of my earlier numbers by bracketing 5 & 6 knots. Here's what I got this time:

4.5 knots = 13,668.8 nm
5.0 knots = 15,590.3 nm
5.5 knots = 16,960.3 nm
6.0 knots = 17,718.9 nm
6.5 knots = 15,644.9 nm

note: None of the numbers were exactly the same. I have no explaination for this, but it never exceeded +/- 0.5%. Chalk it up to human error, or the devil/angel Ubisoft, as you please.

And so, reminding me strangely of my days in the Army, after long hours -days even - of pouring over charts, plotting courses, and double checking calculations, I can firmly state with full confidence:

"Six, Sir. The answer is six."

thank you sir, 6 kts is the s-boats sweet spot for best fuel economy this is very usefull info for the community


would you mind running the test again with a fleetboat (balao or gato) and just check the 8.5kts, 9kts, 9.5kts, 10kts speeds to confirm weather the best setting is 9 or 9.5

[VonHesse]

@ WEBSTER: Not a problem, glad to be able to contribute. You're right, this is very useful information. Somehow, I've been running around all this time thinking that 11 knots was the best - wrong, wrong, wrong.

Hmm, methinks this is what I get for ignoring the golden rule: "Never Volunteer", ha, ha. However, since I did it to myself, I might as well finish the job. I'll run the scenario with a balao at the speeds you requested, and post it up this afternoon.