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43 Bertram speed

Old 09-08-2019, 06:14 AM
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Default 43 Bertram speed

Anyone have experience running a 43 Bertram with 550 hp Detroit’s? I am reading that it will cruise at 23 knots and open up at 27. Looked to purchase one yesterday and the owner said it cruises at 18 knots and opens up at 21.
Old 09-08-2019, 07:21 AM
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23/27 seems a bit high. I would estimate it at 20/23. A lot
of owners have de-propped it so that they aren’t at the upper limits of the power curve on these engines.
Old 09-08-2019, 10:32 AM
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Have you been on one? I need to do at lease 23 knots.
Old 09-08-2019, 10:40 AM
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Originally Posted by Anna Rose View Post
Have you been on one? I need to do at lease 23 knots.
If the boat is loaded lightly and propped correctly you may get close to 23 but you'll be running them very hard maybe 2150+ rpm. At that rate you are burning their service life much faster than if you cruised at 1900 rpms. You realize going that fast you going to be burning a lot of fuel maybe 50 gallons per hour @$4 a gallon = $200 an hour .
Old 09-08-2019, 12:35 PM
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It wouldn't be a good idea to run the 6V92's at 2150rpm's. The 43' Bertram is realistically 20-21 knot cruise. You may be better suited to look at a 43' Viking they will cruise at 24-26 knots depending on power.
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Old 09-08-2019, 01:01 PM
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Originally Posted by Anna Rose View Post
Have you been on one? I need to do at lease 23 knots.
i havent been on a Bertram 43 but I know the 6v92's well. and based on weight and such, you could push 23, but 23 at WOT is a non-starter for you, as you're looking at blowing up an engine if you keep it at 23. You want to be < 2000 rpm for any length of time. Please read and understand the care and upkeep of Detroit Diesel engines. They are amazing engines but you have to take care of them or you're looking at monster rebuild costs.

and if you're looking at 23+ knots - then I suggest you looking at 700+ hp for those size boats.

Old 09-08-2019, 04:26 PM
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Actually looked at a 43 Viking today. Very nice boat.
Old 09-08-2019, 06:12 PM
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viking doesnt ride like a bertram or hatteras, but the do have more speed
Old 09-08-2019, 06:28 PM
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Cabo put 800-900hp MANs into their 43’ when they built it, hull was almost identical to the 43’ Bert, and they got ~28kts out of the boat at cruise. Not an easy hull to get speed out of but, perhaps because, it’s a great sea boat.
Old 09-08-2019, 08:27 PM
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I have a 42 Bertram with 550 6V92's. I'm pretty sure the hull on the 43 has the same dead rise but it is just a little wider. I run mine at 1950 rpm and its doing about 21.5 knots depending on tide and wind. I've seen 24.5 knots with a good tide and wind and 17.5 bucking a strong tide. Wot with full fuel and 100 gallons of water. I see about 26 knots. This boat does have a marlin tower on it. Good luck!
Old 09-09-2019, 05:46 PM
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I love the 42. I think the dead rise is a little less then the 46. How much does the 42 draw?
Old 09-09-2019, 07:05 PM
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It is a little less at 17.5 degrees . I draw about 4-4.5 feet to the bottom of the props.
Old 09-09-2019, 07:19 PM
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For comparison purposes my 43 Cabo has Man CR900s and I cruise at 25-26knts and top out at 32-33knts.
Old 09-09-2019, 08:33 PM
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We run a 1982 42 Bertram with 435 hp 692’s. At about 1900 we run 19 knots, plus or minus 1. Her fuel burn is about 30 gph with the gen set in a reasonable sea. She’s a very comfortable boat. We looked at a 41’ Viking when we bought this and liked the layout and space aboard the Bertram compared to the Viking.
Old 09-11-2019, 06:31 PM
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The 42' is a great boat & will get you the cruise you are looking for with the larger hp 6V92's. The 42' is not their most attractive boat though, but can't have everything I guess. Also look up a thread for a 42' that was re done named Marlin Monroe.
Old 09-12-2019, 06:36 PM
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The 42 resembles the old 58 (although nicer looking).
Old 09-12-2019, 06:57 PM
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Originally Posted by Anna Rose View Post
The 42 resembles the old 58 (although nicer looking).

there’s a Red hull 42 Repower with mans in MD. Very nice.
Old 09-13-2019, 07:11 PM
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If you want speed, why not just go for the 33-45ft CC market?

You're trying to fit square peg to round hole. Yeah, you can throw 900+ HP in there, but man, for what? An extra 3-5 knots? Relax.

Let those DD's do their thing and that awesome Bert hull take care of business. Enjoy the ride where the ship runs it's best and you're not going to give the motors an aneurysm.

Thing we like about our sporty's the most - the ride. Cruise out, cruise back in style at 18-23 knots thru just about anything - and stay dry doing it. Got some jams on the stereo, AC cranking (or heat in winter time), dudes are watching a ball game on the sat TV, or not. Take a nap, cook up some food, whir up a boat drink in the blender or whatever. Enjoy the boat for what it is designed to do.

Fast runs to the grounds are not in these boats. If you want that, get a CC.

edit: boat drinks and 23 knots
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Old 09-13-2019, 07:14 PM
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Originally Posted by Phins360 View Post
If you want speed, why not just go for the 33-45ft CC market?

You're trying to fit square peg to round hole. Yeah, you can throw 900+ HP in there like C dude up there. But man, for what? an extra 3-5 knots? Relax.

Let those DD's do their thing and that awesome Bert hull take care of business. Enjoy the ride where the ship runs it's best and you're not going to give the motors an aneurysm.

Thing we like about our sporty's the most - the ride. Cruise out, cruise back in style at 18-21 knots thru just about anything - and stay dry doing it. Got some jams on the stereo, AC cranking (or heat in winter time), dudes are watching a ball game on the sat TV, or not. Take a nap, cook up some food, whatever, Enjoy the boat for what it is designed to do.

Fast runs to the grounds are not in these boats. If you want that, get a CC.
Couldn't agree with you more
Old 09-13-2019, 07:27 PM
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Love the Henriques

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