The custom build continues; A photo update.

[karenlynncharters]

Thanks Fortunate one. A whole different animal from the project you haven taken on, but it works well for us. The engine was originally rated for 800 MHP but we have de-rated it which just means reprogramming the EMS unit. No change to injectors etc.. The turbo's are different from the Yanmar version- It makes sense that they would be bumped up in size for the 900.

The Lowell 43 is a deep heavy semi- displacement hull. Karen Lynn loves to go 17-22 knots but the hull really was not designed to go 26-27 knots. The upside with this boat is we can go 17 knots right into 6-8 footers quite comfortably. Like you are doing with your boat, we wanted to end up with an extremely stiff and rigid hull structure. We had a naval architect design the hull core and layup, and the internal grid and stringer system to ABS standards so the boat is incredibly strong and stiff.

Here are a few pictures of the structure. Sorry about the low quality....I could have used some photography lessons from you! If you want to see some speed/GPH/% load numbers I would be happy to post them.

[Fortunate One]

Yes you can't really get dispalcement hulls much over 20knts.

I was going to ask who's hull it was and yes I'd be interested in seeing the performance numbers. What did you tune the engine down to? What gear ratio are you running?

Nice reinforcing job and l like the fact that the engine beds were installed low in the hull. Good to keep that CG low especialy with running that Heayd Duty tower. Whats the shaft angle.

I realize that it's geared probably more for good use of the torque band but what prop size are you running?

[karenlynncharters]

The Lowell 43 Hull designed by Carrol Lowell. It has been out of circulation up until the last four years. About 12 workboats have been built from it since then. Most have a 600 HP Deutz.

Engine is about to be detuned to 600 HP. The Gear ratio is 2:1 Shaft angle is 6 degree's. Prop is 4 blade 34 x 36.

Here are the numbers:
RPM's Knots GPH AVG KW HP % Load % Curve Power Curve
1400 13.0 12.5 0.96 175 235 29.8% 65.5% 385
1450 14.0 13.7 0.98
1500 14.9 14.9 1.00 215 288 36.6% 70.7% 416
1550 15.8 16.2 1.02
1600 16.7 17.4 1.04 244 327 41.5% 77.0% 453
1650 17.5 18.2 1.04
1700 18.3 19.1 1.04 272 365 46.3% 84.5% 497
1750 19.0 21.1 1.11
1800 19.7 23.0 1.17 339 455 57.7% 87.9% 517
1850 20.4 24.7 1.21
1900 21.0 26.3 1.25 397 532 67.5% 91.5% 538
1950 21.7 28.3 1.30
2000 22.3 30.2 1.35 449 602 76.4% 95.2% 560
2050 22.9 32.6 1.42
2100 23.5 35.0 1.49 510 684 86.7% 98.3% 578
2150 24.6 37.6 1.53
2215 25.6 40.2 1.57 588 789 100.0% 100.0% 588

[Fortunate One]

Those numbers look like the sweet spot is 17 knts. But that's where most of those downeast boats seem happiest.

I finally had a minute to look over the pictures you posted. That is one well planned fishing machine. You guys did a nice job placing the systems, running wires and portecting everything from chafe.

I like the fact that you guys put protection down where you were stepping and where you were placeing tools. Shows you take care of your stuff.

So it seems as if you took a basic hull and installed engine beds and stiffened up the whole hull.

Do you know how would the ride would compare to an out of the mold hull 43 Lowell with no additional stiffeners?

[triniswordfish]

i like that down east as well
do any of them come with twin diesels or am i missing something?

[karenlynncharters]

Thanks Fortunate, we tried to do things right. We have plenty of mistakes on past boats so hopefully we are learning.

I don't really know how different the ride would be. I have been out on 4 different Lowell 43 hulls and all of them were built differently but all heavy. Ours has not only the grid system of transverse stringers, but we have 1" Corecell foam core and a layer of 1708XM added to inside and outside skins. Most of the Lowell's built do not have core but are solid glass. I think with core they are a little stiffer but definitely lighter which we tried to do but didn't hit our target of 26,000# as we were more like 28,000#. We also have two 320 gallon ballast tanks that can also be used as a additional livewells. When we are either running or fishing in substantial sea's, we turn on the pumps and flood them and the extra 5000+ pounds of weight really settles the boat down even more.

My guess is that you would notice the extra stiffness to some degree on the really snotty days, but more, you would notice it over time as the hull aged and fatigued. Just a guess. Someone on the forum may know a lot more about this.

Here is a shot of one of the ballast tanks full of mackerel.

[nabeelah]

Thats a nice single engined fishing machine.You guys are quite thorough in the Americas!! Just thought that I could share my designers rendering with you guys.It should not be more than 11,000kg fully laden.I really hope to get 32-35 knots out of the Scania 8oohp!!

[nabeelah]

Some more views.....!!Will be meeting designer in New Zealand on 15th May for discussion on length extension to 13.3m and beam to remain at 4m.

[nabeelah]

The Scania agents in NZ,South Pacific Diesels wants to dress up the V8 as I will be their first customer in the Pacific Islands and should resemble the attached image

[triniswordfish]

sexxy engine there
like the chrome