small traditional lobster boat that can be used as a fishing launch or
picnic boat. Economical and versatile semi-displacement hull.
hull weight shown in the table includes the console, empty fuel tank
and basic rigging but not the engine.
Nina (LB22) design is based on a "double wedge" type hull.
This what the H. Sucher writes about them in "The V-Bottom Boat":
. . . The double wedge power launch, so called because its form presents
a wedge shaped appearance both in profile and plan view . . . modern
power boat hulls based upon it are considered by many naval architects
and knowledgeable boatmen to be among the best all-around performers"
. . the most useful and attractive feature of these launches is their
ability to maintain good speed and handle well in rough or choppy water
without pounding or undue spray throwing."
Lobster boats, picnic launches and many large sport fishing boats are
variations on the double wedge hull shape. Those boats go fast with
little power, not as fast as planing hulls (monohedron type) but they
keep going at the same steady speed when the planing hulls are forced
to slow down. Do a search on the Internet to read more praise about
this type of hull.
Nina is a modern double wedge or small lobster boat. She is light and
narrow for her length but will go at 18 mph top with a 30 HP, cruise
at 15 mph. She can not take more than 50 HP and her speed will not be
much greater with more power.
boats transom is designed for a standard 20" shaft. The transom
can easily be modified to accept other shaft lengths.
our fiberglass/plywood composite material is 100% original, there isn't
anything new in the hull lines. It is a proven type with very predictable
behavior. For the looks and layout, we took ideas from several classic
designs: the cuddy cabin is inspired by the Atkins design Ninigret, the
open version windshield comes from Bolger's Halloween, the engine cover
from the Handy Billy that was featured in Wooden Boats. We mixed it all
with a touch of Culler's influence and it became the Nina.
Most of those boats have their outboard in a well. It helps to keep the
CG where it belongs, looks good and reduce the engine noise. You will
barely hear a 4 stroke engine.
Each version shows the same forward seats 7' 6" long and wide enough
to used as berths. There is room for a portable head under the berths.
LB22 is a semi-displacement boat and her top speed will never equal that
of a true planing hull like the C19, OB19 or C21 but she will keep going
fast in bad weather. A hull cross section at the consoles shows an almost
round bottom. The Nina is a light (but strong) and narrow boat with less
cockpit room than for example, the C21. The smaller cockpit is a good
safety factor in real bad weather. The cockpit is self-bailing.
The boat is built in stitch and glue fashion but the hull, is a true
composite sandwich. The plywood is used as a core sandwiched between layers
of directional glass and it is the fiberglass that supplies most of the
strength, not the plywood.
in our other boats, the frames, sole and other components participate
in the structure.
hull can be built the stitch and glue way, upright with panels folded
around the frames or better upside down, using the frames as a jig. See
building tutorial for a step by step overview of the process.
all our stitch and glue boats, the LB22 is easier to build than plywood
on frame or most other stitch and glue boats.
All the plywood parts have been precisely calculated: you cut them flat
on the floor, no need for templates, no need to take measurements from
the hull framing as in the plywood on frame method.
plans show two layouts that differ mostly by the shape of the coaming
cabin side but three versions can be built:
layout with the vee shaped windshield
cabin with a fabric roof on SS frames
cockpit, cabin or open, without the covered motor well
Even the windshield version can be closed with canvas: we show a low bimini
top that can be fitted with sides and a snap-on rear curtain.
The cuddy cabin version features a removable roof: canvas of stainless
steel framing. A rear curtain can close the small cabin.
fisherman looking for extra cockpit room can omit the closed motorwell
and engine cover.
The boat can also be built with a center console.
platforms can be bolted on the transom.
As all of our boats, the LB22 can be made unsinkable with foam, see our
from our BOM)
BOM list materials based on our standard layout and includes a 15% waste
factor for fiberglass. For plywood, we use standard sheets 4' x 8' (122
x 244 cm). Please read the building notes and see the plans for detailed
specifications. Marine Tech or XL boat building plywood is an inexpensive
type of marine ply ideal for stitch and glue construction. It cost, on
the average, less than $20.00 a sheet in 1/4" (6 mm). Okume or Meranti
marine can also be used and cost starts at less than $40.00 a sheet (1/4").
Good quality exterior is acceptable if it has no voids.
recommendation is to use at least marine ply for the outside parts. The
inside can be made from quality exterior with no voids.
See our kits and add the cost of plywood.
The hull can be build in 50 hours but a finished boat will require 200
hours or more depending on the level of detail and the skills of the builder.
Visit our message board, help pages, tutorial pages and read our FAQ:
most questions are answered there.
detailed drawings with all dimensions required to cut the all the panels
from bottom to cabin parts and windshield from flat plywood sheets: no
lofting, no templates required.
Nesting drawings for the best plywood layout, all parts nested.
Plan and Profile
Nesting on standard plywood sheets
Construction with plan and profiles views and sections
Stations with frames, bulkheads and transom outlines
Frames and bulkhead details
Expanded plates dimensions for all hull parts
Details, gunwale, sole, hardware installation
Cabin version details and dimensions
Full Size Pattern for Bow Mold
Small Boat Electrical
building notes for this boat with Bill Of Materials
files reference list and more!
Spokaloo Spokane Washington
Here are some performance stats on our performance from the LB22.
This was done on a 2 run, upriver and downriver measured mile by GPS. Nice windless day, no current, 10 gallons of fuel on board, myself and one other occupant.
RPM | Spd | GPH | MPG
idle | 2.2 | .3 | 9.6
1000 | 3.5 | .3 | 11.6
1500 | 5.0 | .6 | 8.3
2000 | 6.5 | .9 | 7.2
2500 | 8.6 | 1.2 | 7.1
3000 | 11.1 | 1.7 | 6.5
3500 | 13.8 | 2.0 | 6.9
4000 | 17.3 | 2.3 | 7.5
4500 | 20.1 | 3.0 | 6.7
5000 | 22.8 | 3.6 | 6.3
5500 | 23.1 | 4.6 | 5.0
6000 | 27.8 | 4.9 | 5.7
Overall we have been extremely pleased with 4 years of very hard service. We have run many miles, slept countless hours, toured, visited friends, and ran her as our personal taxi and living space since 2008. The hull design itself has performed very well, even with ridiculous loads:
16 people isn't recommended, but proof that there's much flexibility in the design.
My recommendation for her is to install spray rails full length, which makes her a drier boat, gives a bit more payload flexibility (the bow can be more heavily loaded), and would be a small, simple addition for people who want to overpower their boats as I have.
All supplies to build this boat are available from our online stores :: epoxy/glass/paint and more :: plywood
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