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Old 03-02-2021, 02:15 PM   #1
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10-12knt trawler? 40'

Hi, we just sold our bayliner 3288 and are looking for something bigger.

Its about 35 nautical miles to cross the straight from our dock . With currents... 7-8 knots would be too slow.. just for the crossing, after work on a Friday for example..

40' 10-12knts economical cruise speed.. 1 Walk-around bed and another separate guest area for 2 adults. Upper helm. (Lower helm not necessarily needed).

Considering a 2000 bayliner 3788..or older 3988.. may not be a big enough.. and may not be suited to 8 knot long haul trips that we enjoy when there are no time constraints. I know the 3988 is not great at slow speeds. Don't care for the 38xx series bayliners..

Cruising area.. pacific northwest.

Budget.. tight... 150,000 cad.

Any ideas would be appreciated!

Thanks
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Old 03-02-2021, 02:32 PM   #2
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You can't overcome hull speed except with horsepower. 40' = 8+kts.Your not going to cruise economically at 12 knots with a 40' boat. Get a longer boat or think about a sport fishing type.
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Old 03-02-2021, 02:36 PM   #3
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Our 41’ President will do that easily and we will be selling it this spring, but it is in Michigan...
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Old 03-02-2021, 02:46 PM   #4
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Yes thanks...the harbourmaster may let us get away with max 46 oal' including tender overhang.. maybe "economical" was the wrong wording.. 1.5 nautical mpg maybe at 12 knots?
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Old 03-02-2021, 02:47 PM   #5
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There are a couple of those (president)boats available in Washington state..once the borders open ill get a good look at one. Thanks
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Old 03-02-2021, 02:52 PM   #6
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Even 1.5 nmpg at 12 kts is optimistic for a boat that size. But if you can live with 1 nmpg at fast cruise, that'll get you up into the range of fully planing hulls, as there are some that'll do 1 nmpg at 16 - 18 kts. 12 kts is just a tough speed to design for, as it's not enough to plane, so most hulls that can do that speed are pushing a lot of water to do it.
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Old 03-02-2021, 02:57 PM   #7
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I plugged in some grabass numbers for a 40' semi-displacement hull into Vicprop's prop hp calculator. For a 40' boat of 30,000 lbs displacement to reach 12 kts, takes 169 hp and will burn roughly 10 gph.

So look for a boat with at least 300 hp which will be enough that 169 hp won't be too much load on it.

Any of the older Lehman or Perkins N.A. powered boats won't work, unless it is the turbo version. Look for a Cummins 6B 370 , Cat 3116 350 or Yanmar 6LY 370 powered boat at least for singles.

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Old 03-02-2021, 02:59 PM   #8
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" Even 1.5 nmpg at 12 kts is optimistic for a boat that size. But if you can live with 1 nmpg at fast cruise, that'll get you up into the range of fully planing hulls, as there are some that'll do 1 nmpg at 16 - 18 kts. 12 kts is just a tough speed to design for, as it's not enough to plane, so most hulls that can do that speed are pushing a lot of water to do it."

, I guess that will have to be the criteria, could be OK with the 1 mpg at 12 knots if the 8 knot mpg is in the sweet spot.
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Old 03-02-2021, 03:01 PM   #9
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On an average 40 footer with diesels, I'd figure slow cruise should give somewhere in the 2.5 - 3.5 nmpg range at 7 kts, probably 2 - 3 at 8 kts depending on the hull shape and waterline length.
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Old 03-02-2021, 03:03 PM   #10
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Quote:
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I plugged in some grabass numbers for a 40' semi-displacement hull into Vicprop's prop hp calculator. For a 40' boat of 30,000 lbs displacement to reach 12 kts, takes 169 hp and will burn roughly 10 gph.

So look for a boat with at least 300 hp which will be enough that 169 hp won't be too much load on it.

Any of the older Lehman or Perkins N.A. powered boats won't work, unless it is the turbo version. Look for a Cummins 6B 370 , Cat 3116 350 or Yanmar 6LY 370 powered boat at least for singles.

David
There's that math and physics messing everything up for us dreamers lol!

Thanks that is good info.
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Old 03-02-2021, 03:11 PM   #11
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I have a 41 foot boat (about 38'lwl) powered by two 220 hp Cats. The broker listing said "16 knot max". That may be true, but 13 kts produces more noise than I can bear, so I've never pushed it to "wide-open"


As to fuel consumption, I can get a reliable 1.7mpg at 8 knots--1600rpm. On the rare occasion when I run at 12kts, 2200, consumption falls below 1mpg. Fortunately, my background is entirely in sailboats, so I still find 8 knots to be fast.
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Old 03-02-2021, 03:46 PM   #12
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Our 41’ President with SP225 Lehmans did 17 knots WOT on the sea trial. We generally cruise about 9 knots. We get about 1.25 kmpg at 10 knots.
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Old 03-02-2021, 04:43 PM   #13
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12 knots is not a good speed for a 40' boat. It will not be on plane and too fast for economical cruise. Just pushing water for no real gain.
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Old 03-02-2021, 04:55 PM   #14
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Our 41’ President with SP225 Lehmans did 17 knots WOT on the sea trial. We generally cruise about 9 knots. We get about 1.25 kmpg at 10 knots.
Thats pretty good. Is that the aft cabin?
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Old 03-02-2021, 04:59 PM   #15
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12 knots is not a good speed for a 40' boat. It will not be on plane and too fast for economical cruise. Just pushing water for no real gain.
Yes, I would like a 42 grand banks or ocean Alexander.. possibly a 42 chb europa style.. but it looks like I'll have to be in a semi planing hull.
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Old 03-02-2021, 05:22 PM   #16
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10-12knt trawler? 40'
Nope, ain't gonna happen.
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Old 03-02-2021, 05:52 PM   #17
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https://scontent-sea1-1.xx.fbcdn.net...f5&oe=60638942

May be light enough to fill your bill re speed.
Hullform is very compliant to 10-12 knots.
Usta be readily available. Now would take a lot of looking.

Another scarce boat (but plastic) a 41’ descendant of the Camano boat formerly built in BC. Don’t remember the decendant’s name but they were claimed to be very efficient .
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Old 03-02-2021, 06:02 PM   #18
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10-12knt trawler? 40'

How about one of the PDQ 34s? They can do that speed economically.

Not a 40’ boat obviously, but maybe it has the room of a 40’ monohull?
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Old 03-02-2021, 06:16 PM   #19
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Yep, I could look for those.. thanks
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Old 03-02-2021, 06:39 PM   #20
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Thats pretty good. Is that the aft cabin?
Yes, it has an aft cabin. There are a lot of different interior layouts in the 41s. But they all have at least 2 cabins and galley down. I have seen a couple that have 3 cabins but they seem cramped to me.
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