Maximum Range at current speed reports

Icehornet · 10-28-08, 12:18 AM

Before I start, I just want to sum up my 'tech know how' with a quote from Oddball in the movie 'Kelly's Hero's':

"I only ride the things, I don't know how they work."

Now that you pretty much get the idea of my level of things, I ask this question:

Is there a fault with the 'Maximum Range at current speed' reports?

I ask, because I got the following reports (simplified for reading sake), while just leaving port. For reference, I'm in a Gato in April 1942 and using SH4 1.5 with RFB and RSRD (current versions). I would select X speed, wait to settle, check report, then repeat:

4236 miles - at 3kts
8281 miles - at 6kts
10565 miles - at 10 kts
4091 miles - at 17kts
2671 miles - at 21kts

Now, I have read that the best balance between speed and range is with the Ahead Standard bell (10kts), so speeds above this make sense that I have lower maximum ranges.

What I don't understand is the lower maximum ranges at the lower speeds, and hence my question of a fault with the reporting function. :hmm:

However if this is the case and the above 'reports' are 'correct' then I shall ask no more, and be at least content that things are the way they should be.

I did do a search, but I couldn't seem to find what I was looking for. In the case that I have missed an explanation, I would be grateful if somebody could point me in right direction, or give me a run down on why things are the way they are.

I posted here, because of the above mods I using (RFB and RSRD) and thought this was the correct place to put my question.

Cheers for any help.

ncorpuz34 · 10-28-08, 03:00 AM

A quote from Task Force from this thread: http://www.subsim.com/radioroom/show...fficient+speed

"If you go slower than the standard bell [the boat's most efficient speed] you use up more fule cause your motors are useing fule at a higher rate than you are moveing."

So, the sweet spot for the fleet boats is about 9.5-10 knots. S-Boats (using RFB) is 2/3 bell which will push you about 6knots.

alamwuhk2a · 10-28-08, 03:34 AM

The most fuel economy speed is 0.45 * max speed.

Icehornet · 10-28-08, 04:19 AM

That clears up a great deal.

A big thanks to Zephey, who sent me a PM expanding on the quote ncorpuz34 had posted.

alamwuhk2a, I'll keep that little formula in mind, handy to know!

Cheers all!

10-28-08, 12:18 AM	#1
Icehornet Swabbie Join Date: Oct 2006 Location: OZ Posts: 7 Downloads: 26 Uploads: 0	Maximum Range at current speed reports Before I start, I just want to sum up my 'tech know how' with a quote from Oddball in the movie 'Kelly's Hero's': "I only ride the things, I don't know how they work." Now that you pretty much get the idea of my level of things, I ask this question: Is there a fault with the 'Maximum Range at current speed' reports? I ask, because I got the following reports (simplified for reading sake), while just leaving port. For reference, I'm in a Gato in April 1942 and using SH4 1.5 with RFB and RSRD (current versions). I would select X speed, wait to settle, check report, then repeat: 4236 miles - at 3kts 8281 miles - at 6kts 10565 miles - at 10 kts 4091 miles - at 17kts 2671 miles - at 21kts Now, I have read that the best balance between speed and range is with the Ahead Standard bell (10kts), so speeds above this make sense that I have lower maximum ranges. What I don't understand is the lower maximum ranges at the lower speeds, and hence my question of a fault with the reporting function. :hmm: However if this is the case and the above 'reports' are 'correct' then I shall ask no more, and be at least content that things are the way they should be. I did do a search, but I couldn't seem to find what I was looking for. In the case that I have missed an explanation, I would be grateful if somebody could point me in right direction, or give me a run down on why things are the way they are. I posted here, because of the above mods I using (RFB and RSRD) and thought this was the correct place to put my question. Cheers for any help.

10-28-08, 03:34 AM	#3
alamwuhk2a Helmsman Join Date: Jul 2006 Location: Hong Kong Posts: 107 Downloads: 12 Uploads: 0	The most fuel economy speed is 0.45 * max speed. __________________ Come from the secret Hong Kong U-boat base

10-28-08, 03:00 AM	#2
ncorpuz34 A-ganger Join Date: Sep 2008 Posts: 72 Downloads: 118 Uploads: 0	A quote from Task Force from this thread: http://www.subsim.com/radioroom/show...fficient+speed "If you go slower than the standard bell [the boat's most efficient speed] you use up more fule cause your motors are useing fule at a higher rate than you are moveing." So, the sweet spot for the fleet boats is about 9.5-10 knots. S-Boats (using RFB) is 2/3 bell which will push you about 6knots.

10-28-08, 04:19 AM	#4
Icehornet Swabbie Join Date: Oct 2006 Location: OZ Posts: 7 Downloads: 26 Uploads: 0	That clears up a great deal. A big thanks to Zephey, who sent me a PM expanding on the quote ncorpuz34 had posted. alamwuhk2a, I'll keep that little formula in mind, handy to know! Cheers all!