49' Monsoon Study Drawing
| 49' Monsoon Watercolor Image
46' Monsoon Outboard Profile |
46' Monsoon Interior P & A
Watercolor © 2000 Lena Kasten
General Concept
Monsoon is designed for a couple with occasional guests
for coastal cruising in US and European waters. Inspiration for this vessel
came from an early sketch of a trawler yacht with a 'midship wheel house,
forward stateroom, and aft saloon & galley. Above, we see a color image of
the original study drawing of the 49' Monsoon. In one of the
above links you will also find a nice watercolor rendering of the 49'
Monsoon.
In order to squeeze the interior requirements into the least possible
size, a slightly shorter vessel was developed at 46 feet LOA. In my
view, the three extra feet in the 49 footer provide a vast improvement and
at very nearly the same cost. The longer waterline allows faster
running for the same horsepower, therefore a slightly longer range; a bit of
added room in each compartment; and a considerably more graceful appearance.
Particulars of the 46' Monsoon are: 46'
LOA x 38' 9" DWL x 13' - 6" Beam x 4' - 11" Loaded Draft. With a
design displacement of 39,000# Monsoon is of medium weight for her length.
Displacement will vary from around 38,000# when light, to a full load
capacity of 49,000# with tanks full and the boat ready for a voyage.
Particulars of the 49' Monsoon are: 49'
LOA x 41' 3" DWL x 13' - 6" Beam x 4' - 11" Loaded Draft. With a
design displacement of 43,250# the 49' Monsoon is of relatively light weight
for her length. Displacement will vary from around 39,000# light, to a full
load capacity of 52,000# with tanks full, ready for a voyage.
In both versions the layout is identical, with the 49' vessel having just
a bit more space dedicated to each compartment. In either case the
hull, deck, and house construction are steel, with cold moulded wood cabin
top and pilot house top. The wood house top is more or less standard
on our steel vessels under around 50 or so feet LOA. Primarily this is
to save weight and to simplify construction, but it also keeps the hull open
during fabricating and painting - a big plus... All aluminum
construction is also equally possible, in which case the house tops would be
metal.
In metal vessels, the tanks are always integral with the hull, which
saves weight, saves space, increases tank capacity, allows for easier
maintenance, and makes for simpler, easier construction.
Propulsion
The specified engine is a Lugger or John Deere 6 cylinder
naturally aspirated diesel of approximately 115 hp continuous at 2,200 rpm.
The gear is a Twin Disc having a 3:1 reduction and a 28 inch 3 blade fixed
propeller. This combination was chosen for the sake of ruggedness, extreme
simplicity, and for the sake of economy in building. The engine space is
very adequate, and enough extra room has been allowed for the optional
placement of a generator. Sufficient fuel is provided for a Bermuda /
Azores crossing from the US to Europe, giving a range of 2,000 NM at an S/L
of 1.2. An additional pair of long range saddle tanks are also
possible, giving a full 3,000 NM range for the longer passage from the US
west coast to Hawaii.
Hull Form
The hull is modeled after the Pacific Northwest commercial
fishing vessels but with a much finer overall form. A single chine shape has
been chosen for ease of construction in steel, and for better roll
attenuation. A fine entry combined with a long graceful run aft provide a
very easily driven hull. Prismatic has been optimized for the anticipated
Speed to Length range during coastal ocean and inshore cruising.
The steel rudder is heavy duty and is well supported. The rudder is a
balanced design for minimal stress on the steering gear. A NACA 0012 series
foil shape is used for low drag and maximum turning angle without stalling.
An end plate is used on the rudder bottom for greater steering efficiency,
and a hole is provided for withdrawal of the propeller shaft.
Accommodations
The layout on either version of Monsoon makes use of a forward
cabin extending from just forward of the midship pilot house to the bow. The
fore cabin top extends the full width of the ship. This will provide the
greatest amount of interior space, the largest open deck area, the greatest
forward freeboard and the most reserve stability.
Within the forward cabin is the owner's stateroom with a generous queen
berth. To starb'd is a head, and to port a shower.
Aft of the owner's cabin / head / shower is a weather tight companionway
and a ladder leading up to the pilot house, located at the same level as the
exterior side decks.
To starb'd and aft in the pilot house is a weather tight companionway
that leads aft and down a ladder to the aft cabin. At the base of the ladder
is a short passage leading to the galley.
The galley extends across the full width of the vessel. Within the galley
forward is a long counter that houses a refrigerator and the stove.
The galley counter wraps around to port and aft. A double stainless
deep sink is located to port. In the starb'd part of the galley is a
deep freeze.
A structural bulkhead right aft of the galley separates the galley from
the saloon. The bulkhead is arranged for maximum strength as well as the
maximum open area between galley and saloon. Passage aft is on center.
The saloon has a settee to port and to starb'd with a table located
between them, securely fixed to the cabin sole. The table contains storage
for wine and spirits, and has a folding leaf on both sides to allow easy
passage fore and aft.
The settees are intended to function as pilot berths during passages, and
as guest sleeping quarters at other times. Lee cloths are provided for
secure sleeping at sea. A curtain is arranged to provide privacy between the
galley and the saloon. Aft of the settee berths are a pair of bureaus for
general storage. Between the two bureaus is the companionway ladder leading
up and aft to the after deck through a water tight scuttle.
Layout On Deck
Substantial bulwarks and toe rails surround all the exterior
decks. The aft deck has sufficient room for a pair of folding chairs and a
small folding table to be placed there for casual seating. A 36" high
railing extends around the after deck and along the side decks, with an
opening for boarding both port and starb'd.
To starb'd of the scuttle leading forward into the aft house is a ladder
leading upward to the aft house top. The aft house top accommodates simple
seating and an on-deck table. A 36" high railing extends around the
perimeter of the house top. Under way, a skiff is stowed on top of the
house. An A-Frame mast supports paravane poles on either side.
Forward of the pilot house is a large foredeck which is clear except for
the two sky-lights, the windlass / anchor arrangement, and the cleats, bitts
and dorades.
Further Development
This is quite a versatile design, which improves dramatically as the
vessel gets longer. For example, the 46 footer has the appearance of
being a bit tall for her length. The 49 footer is the same height, but
is considerably more graceful. As a further development of this design
we have explored another prototype of Monsoon at 60 feet. Check out
this image of the Monsoon 60 prototype.
