View Poll Results: My most common cruising speed is: (You may select more than one)
Below 7 knots 26 26.53%
7 to 9 knots 61 62.24%
9 to 11 knots 7 7.14%
12 to 14 knots 5 5.10%
14 to 17 knots 3 3.06%
17 to 20 knots 5 5.10%
20 to 25 knots 6 6.12%
Over 25 knots 4 4.08%
Multiple Choice Poll. Voters: 98. You may not vote on this poll

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Old 11-07-2015, 02:51 PM   #21
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OK, Marin. Now we're getting some where... Why not cough up a pict and description?!
Sorry, Art. We've had this boat for awhile now but we own it with a partner who wants no publicity about it. I described a few basic things about it to a couple of people here via PM some time ago and he was not happy about it. So it's fast and uses a lot of fuel and that's about it.
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Old 11-07-2015, 04:03 PM   #22
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Here's a 4 year average. I measure anchor to anchor, dock to dock or when we're fishing so there are some slow speeds added in there. The paravanes are out about 80% of the time which costs us about 3/4 of knot penalty. Hobo (FD) displaces ~44k lbs. and has a single FL SP 135. 1706 engine hours took us 10,725 nautical miles at an average speed of 6.3 knots.

edit: engine is turning about 1650 to 1750 rpms.
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Old 11-07-2015, 04:09 PM   #23
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9.8 knots. 1600 RPM.
Twin Cat 3116 / 300 hp
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Old 11-07-2015, 05:00 PM   #24
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Sorry, Art. We've had this boat for awhile now but we own it with a partner who wants no publicity about it. I described a few basic things about it to a couple of people here via PM some time ago and he was not happy about it. So it's fast and uses a lot of fuel and that's about it.
Oakee Dokee!!

Your dog mention it to him?
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Old 11-07-2015, 05:05 PM   #25
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1100 rpms/8kts, 1800 rpms /15 kts, twin 6-71 TI's ;45,000lbs
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Old 11-07-2015, 08:48 PM   #26
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Originally Posted by Marin View Post
Sorry, Art. We've had this boat for awhile now but we own it with a partner who wants no publicity about it. I described a few basic things about it to a couple of people here via PM some time ago and he was not happy about it. So it's fast and uses a lot of fuel and that's about it.
I think it's a PT boat.
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Old 11-07-2015, 09:15 PM   #27
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I think it's a PT boat.
Cool if so... but, I'm not at all sure.
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Old 11-07-2015, 09:23 PM   #28
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Come on guys, please. Respect Marin's right to privacy on the subject.
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Old 11-07-2015, 09:26 PM   #29
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Come on guys, please. Respect Marin's right to privacy on the subject.
Oakee Dokee!! Well... sort of!
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Old 11-08-2015, 07:57 PM   #30
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Cool if so... but, I'm not at all sure.
He already said it is. Got a partner so it must be PT.
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Old 11-09-2015, 01:17 PM   #31
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8.5 knots, 1350rpm, 24tons, 48' LWL/55' LOA= 6 GPH


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Old 11-09-2015, 02:38 PM   #32
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Cruising Speed

My 2007 Helmsman 38 has a Cummins QSB 5.9 (380 HP) and weighs 35,000 lbs with full 400 gal of fuel and 140 gal water. It cruises very well at 7.5 Kts with fuel consumption of 2.5 to 3.0 GPH @ 1500 RPM.

When delivered this engine was programmed for 230 HP. For some reason the previous owner decided to have Cummins reprogram it to 380 HP, and put trim tabs on it. I guess he thought he could get it to plane. IMHO someone sold him a bill of goods.

The only time I use the extra power is when bucking headwinds and heavy seas. Then I only use enough power to maintain my 7.5 Kt hull speed. Last time I did that we had 35Kt head winds and 5-6 Ft seas. My fuel consumption went up to 6 GPH at 2100 RPM.
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Old 11-09-2015, 03:42 PM   #33
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Cruising speeds

Fwiw we are a full displacement hull,128k pounds with all tanks empty at last haul-out on a little more than 50' of waterline. Speed for us varies all over the place, much more than the amount fuel we decide to feed the engines. Wind, waves, currents, fuel load and bottom growth all have significant effects on our travel speed. Strictly by the numbers the last time I checked; 24.4 k gallons over 4.8k hrs and 33k miles came out to 6 7/8 knots and apparently equal to .95 *sqrt of our waterline. Engine loads at this speed is about 30 to 35 percent. Can't seem to access the polling from the mobile app.


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Old 11-09-2015, 04:14 PM   #34
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I've sent a link from this thread to ' the perpetual motion prize fund'...

...I'm am certain several boats on here will scoop the big $million prize. Lol.

PS: just to make all your claims more credible divide the tonnage of your boat by 5 [5hp/ton @displ. cruise Speed]

This gives you the HP required.....then divide this by 20 [ 20hp/gal for diesels ]

Which , horror.....your fuel consumption has doubled!
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