General Concept
The 43' Roberta shares a general layout with a
family of our motor yacht designs, starting with the 43' Moxie and,
extending up to their bigger brothers, the 49' Quinn,
the 50' Renegade, and the 60' Peregrine.
A very similar close sister to the 43' Roberta shown here is the
43' Roberta Jean. Each of these designs represent examples of my own ideal Motor Yacht type,
in particular in terms of the long raised fore deck, aft-located pilot
house, and fantail stern...!
In fact the Moxie, Quinn, Renegade and Peregrine designs
were all created with one client in mind: myself...!
Thus each of them represent the ideal type of boat for coastal cruising
nearly anywhere along the coastlines of the world.
In the case of the 43' Roberta we have been asked to create a
design that uses the same excellent interior layout as
that of the 43' Moxie, but with a slightly heavier displacement hull form in
order to provide a little more elbow room throughout. In this case, we've chosen a hull type from
our lineage of Tug-Yachts: the Boojum,
Buster and Nidaros designs. These
designs have a relatively much deeper body for the sake of maximum carrying
capacity and sea-going comfort. Still, they share the excellent
fantail stern - a natural for a metal boat - and a rather plumb stem, very
much in line with the Moxie to Peregrine series...
Overall height is kept under 3.5 meters in order to also allow cruising
the canals of Europe.
Roberta vessel particulars are:
43' - 0" Length on Deck
12' - 6" Moulded Beam
39' - 7" WL Length - Half Load
5' - 1" Draft - Half Load
9' - 5" Air Draft - Half Load
42,000 Lb Light
54,000 Lb Loaded
Layout
One of the main features planned for Roberta was to have a large
sheltered aft deck for part-time outdoor living. The aft deck could
even be screened in or enclosed by a canvas / vinyl dodger in cooler weather. A large
open fore deck allows plenty of space for sun tan adventures and for stowing
the shore boat and other gear.
Inside, the layout is as conservative as possible in order to keep boat size within limits, but still extremely comfortable for a couple and occasional guests. The settees can be made into berths,
as can the pilot house dinette. Combined with the aft-facing seat on
the aft deck, conceivable there is sleeping space for seven...!
The galley is quite generous, occupying a generous
part of the port side aft. There is a large head / shower opposite the
galley to starb'd.
Construction
The choice of aluminum for the structure on Roberta has primarily
been to keep weights as low as possible as well as for sheer ruggedness.
All parts are intended to be NC cut by plasma arc or water jet. The NC cutting process leverages the work already done to create the computer model, allowing structure to be easily defined directly from that computer model. The resulting "boat kit" makes for very fast assembly. Once the parts have been pre-cut and delivered, the frames and other internal structure
are quickly erected, the stringers placed, and the plating applied.
Power And Range
As with
all the vessels in this series, Roberta maximizes the WL length in order to
have the most boat speed on a given length of vessel. Horsepower requirements and fuel use
will be quite modest, and any of the naturally aspirated small 4 cylinder
diesel engines should suffice amply for propulsion.
Compared to Moxie, Roberta has a much deeper hull form, therefore
greater displacement, and has been given a slightly greater fuel capacity in
order to achieve the same approximate range under power.
Per Beebe algorithm for range calculations, Roberta should
achieve around 3,000 NM at 7 knots on a fuel capacity of 800 USG
with 12% held out as reserve.
A 4 cylinder John Deere engine will be quite sufficient for this vessel.
If one were to prefer a naturally aspirated engine, the JD 4045 at around 75
to 85 hp should push the vessel along at S/L 1.2 to 1.32. If using
the turbo version, at 105 to 130 hp, there would be plenty left over for
punching into the weather.
The engine shown is a John Deere 4045 TFM, mated to a Sabb controllable pitch gear and Helseth self-contained shaft system having a three blade controllable pitch propeller.
In Summary
For a couple seeking a comfortable life afloat, the 43'
Roberta combines all of the basic necessities with the luxury of a spacious and un-crowded interior. In terms of the perfect
interior for a personal motor yacht, the Moxie - Roberta - Quinn - Renegade
- Peregrine designs are my own first choice.
To me, the primary appeal of these designs is the excellent accommodations for two,
even in the larger sizes. Guests can be accommodated by various means,
all of which do not require there being a separate dedicated cabin for
guests. The covered after deck offers protection from sun and rain;
the gourmet size galley and big saloon allow the luxury of fine dining
afloat... Combine that with simple construction and economical powering...
it is a winning combination to say the least!
For more information on these vessels, please contact us...
Click for Larger Image
Other Designs in the same
family of Interior layouts...
36' Molly | 43' Moxie |
43' Roberta Jean | 49' Quinn | 60' Peregrine |
64' Peregrine
| 66' Nusa Tengara
Other Designs in the same
family of Hull Shapes...
22'
Boojum | 25' Boojum |
30' Boojum |
30' Buster | 32' Terrier |
38' Nidaros
