CONCEPT
The Johnny B Good was created as a preliminary design study for a client who wanted an expeditionary long range heavy duty trawler yacht for ultimate conditions. The primary requirements were maximum comfort and safety for long range offshore voyaging. A hull form similar to that of an offshore supply vessel was chosen for the sake of maximum interior volume, and plenty of
carrying capacity. At 70 feet overall length, and with two accommodation levels throughout, there is no shortage of accommodation space for an extended family.
LAYOUT
The exterior decks are at three levels: a swim-deck aft for easy boarding; a 'midship deck which forms the main living area; and a forward deck for piloting and maneuvers.
The forward deck extends from the deck-step amidships all the way to the bow. This provides ample walk-around space, as well as a large anchor handling area. The interior of the pilot house is one step above that, so there is excellent visibility all around. The pilot house is quite large, and contains a head and settee / dinette, as well as very ample chart desk and nav / helm station.
In order to provide the ultimate in visibility and fair weather boating and lounging, there is also a flying bridge above the pilot house.
The 'midship deck extends from the aft end of the pilot house all the way to the swim deck. Aft, a generous covered exterior cockpit is provided for entertainment in the shade and out of the weather. The interior 'midship deck house is at the same level as the exterior deck, and contains the galley and a generous saloon.
Above the saloon amidships is a large "boat deck" for water toys. It is large enough to be shared by the shore boats, and a generous "party deck" area just aft of the flying bridge.
The swim deck right aft has a stairway to port and to starb'd for access to the 'midship deck. A passerelle hinges from the centerline, allowing a convenient Mediterranean mooring stern-to, and also allowing boarding from a dock off the side. Underway, the swim deck is enclosed by a stern railing with removable center section.
Below forward are twin staterooms and a shared head. Below the pilot house is the master suite and large walk-through head. Within the master suite is also a sitting area, entertainment center, and small office.
Below the galley is the engine room, which is intentionally located as close to amidships as possible, and just a bit aft. Tankage is located to port and starb'd within the engine room and also in the bilge areas. The engine configuration is so-far intended to be twin diesels and twin generators. The twin engines provide propulsion redundancy and flexibility regarding the use
of low power for long range travel. The twin engines are arranged to drive a single centerline propeller.
Below the aft deck is a combination utility room / laundry / control room, which is intended to contain the majority of the non-noise generating machinery. This is often preferred for the sake of maintaining those items and also for monitoring the engines from within a space that is not in the high-noise / high-heat main engine room environment.
Below the aft cockpit deck and swim deck are the steering gear and lazarette storage. The fo'c's'l is of a generous size, and contains the anchoring gear, rode, dock lines and
so forth. A "double bottom" area below the lower cabins contains the vessel's tankage, as well as a mechanical alleyway down the center.
STRUCTURE
The Johnny B Good is planned to comply with the EU rules regarding structure, safety, and stability. Structure is all steel, and according to the ABS scantling rule for Motor Pleasure Yachts. Stability is according to the IMO requirements for offshore vessels, including the IMO extended weather criteria.
Interior materials have been chosen to provide a traditional elegance reminiscent of a comfortable paneled library. For an extended family or for a couple who enjoy entertaining, the Johnny B will provide a unique combination of ruggedness, seaworthiness, sea-kindliness, along with a generous measure of luxury.
PRELIMINARY CALCS
The preliminary design has a working displacement of 250,000 pounds, a draft of 5.5 feet, a waterline length of 60 feet, and a beam of 20 feet. The cabins provide 7' of standing headroom throughout. Mechanical spaces are arranged with a minimum of 6' - 8" headroom.
Preliminary calculation results for the Johnny B in the 'light ship' condition are as follows:
Length Waterline: 59 Ft
Hull & Keel Draft: 5 Ft
Beam Waterline: 20 Ft
Light Ship Displacement: 220,000 Lb
Light Ship Displacement to Length (D/L): 479
Displacement Hull Speed in Knots: 10 Knots
Engine HP for Displ. Speed: Approximately 550 HP
Efficient Voyaging Speed (S/L 1.1): 8.5 Knots
Theoretical Engine HP at S/L 1.1: Approximately 240 HP
You will note that the vessel is quite heavy and this is by intent - for maximum comfort and the ability to take on a generous load of fuel, water and stores. Fuel capacity is 7,500 US gallons (28,400 liters). Keeping a 15% reserve of fuel, the vessel will have a 4,000 NM range at 8.5 knots.
A CLASSIC MOTOR YACHT
Johnny B Good is a true 'expeditionary' trawler yacht intended for world cruising; a vessel that will stand the test of the elements and that will provide a comfortable home on the water.
