Palmer Johnson takes on the ‘World’
Te first 81.4m long ‘PJ World’ ice class 1B ‘exploration’ yacht is now being built in Norway.
B
uilt to DNV class and for an unspecified client, the Palmer Johnson ‘PJ World’ yacht now under construction at the
former Flekkefojord Slipp & Maskinfabrikk shipyard in Norway has been designed by Rolls Royce company NVC Designs, with interior and exterior superstructure design by the Italian company Nuvolari-Lenard. Te six deck yacht, with a beam of 14.6m,
a draught of 4m, and speed of up to 16knots, with a range of 10,500nm (at 10knots), is being aimed at owners wanting to operate in rougher seas. Accordingly, while including all of the luxury interior features required by the discerning yacht owner (gym with spa, a cinema, a swimming pool, a heli aſt-deck, etc), PJ World’s hullform is actually derived from the Rolls-Royce UT Design platform of offshore support vessels. Te hull’s attributes include avoiding loss of
speed in head seas, a reduction in vibration and noise levels, and improved manoeuvrability and control. With a newly developed Rolls-Royce DP1 dynamic positioning system, the 600dwt,
The new ‘PJ World’ class of yacht, whose hull form is derived from the widely used UT Design of offshore support vessel.
2800gt yacht will feature four stroke diesel electric propulsion, in the shape of the six cylinder Bergen C25 type engine, commanding 2000kW at 1000revs/min, as well as twin Azipull podded propulsors and one (type 1300) Rolls-Royce tunnel thruster. Te owner’s apartment is situated on the
fourth, fiſth and sixth decks comprising of a bedroom suite, separate business and private lounges, an office and a Jacuzzi sundeck with
Simple strips to adjust pitch
Quickly applied, ‘slot-in’ solution could offer mega yacht operators the chance to adjust propeller pitch at low cost.
V
EEM says it has patented the ‘Interceptor’ propeller concept, designed to attain the right engine
revs and load without the need to change or modify the propellers it supplies. Te Interceptor changes the chord of the
propeller without its removal from the vessel by using Interceptor ‘strips’ of different heights inserted in the propeller’s trailing edges. All VEEM custom propellers are five-axis
CNC-machined on 100% of the propeller, with critical surfaces machined in a single set up. Propellers may still, however, have to be adjusted up or down by 100rpm. Instead of bending the propeller to change its pitch, colour coded, polymer Interceptor
The Naval Architect July/August 2009
strips of different heights are slotted into and locked into a machined recess in the trailing edge of the pressure face of each propeller blade. Once fitted, the strips cannot come out of their grooves unless they are pulled from the hub end using a hooking tool. Te strips protrude above the metal of the
blade and create the ‘Interceptor’ effect, or surface discontinuity. Strips are manufactured with an included angle equal to or less than 90degs, causing a “wedge” of circulating fluid to be captured, which induced more liſt. Te higher the Interceptor, the higher the effect on the propeller pitch. No information was given, by VEEM however, regarding the potential vortex effects, nor was there guidance on the
strips’ effects on propeller efficiency. If a correction in pitch was required, VEEM
said the strip would simply be taken out and replaced by one of a different height, by a eliminating the need to either change to a new propeller or mechanically alter the existing propeller. Changing strips allowed alterations to propeller pitch at any time, so that changes in vessel weight or trim, windage caused by adding towers or clears, running tanks full to maximise range or even operating in different environments such as hot tropical regions, can all be easily accommodated. VEEM Interceptor strips can be adjusted
from a protrusion height of 3mm down, in 0.5mm increments. NA
73
360deg viewing. Te design also demands liſts capable of
spanning four deck levels. Terefore, the vessel will feature three marine liſts supplied by Liſt Emotion BV. It is understood that the first contract
between Palmer Johnson and Rolls-Royce envisages the construction of a second yacht and includes options for two more vessels to the same design. NA
Feature 4
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