Delivered: Devonport 50M superyacht "Alamshar"

UK based company Devonport has finally delivered the mysterious and much talked about 50-meter superyacht "Alamshar". This vessel probably takes the prize for longest period between launch and final delivery. Built under project name '305' she is a highly technical superyacht packing alot of power. Her unique propulsion system allows her to reach blistering speeds for a 50-meter superyacht. The propulsion system is comprised of a gas turbine set up. Six gas turbines propel Alamshar with the option of cruising with one for more efficient running. COGAG gears connect two gas turbines for a single shaft output power to a waterjet. The transmission of power to the waterjet may be from either connected turbine, or the combined power of both.

Luxury yacht Alamshar has been in construction for a protracted period due, in main part, to the technical challenges faced by the two manufacturers of the gas turbines, Pratt and Whiney and Rolls Royce. At the outset, different combinations of gas turbines were considered but the final choice came down to the Pratt and Whitney model ST40M, extensively used in the Norwegian Navy together with the Rolls Royce 601-KF11. Changes in the ship sets of the engines required substantial modification to the Renk reduction gears.

Being waterjet-propelled, the yacht is agile as it is very responsive to the throttle for speed changes and steering is very responsive as it maneuvers by employing its two outboard water jets and its bow thruster. With the combination of gas turbines powering waterjets there is virtually no perceptible mechanical vibration, which complements this acoustically engineered yacht. Acoustic levels are extremely low for the comfort of the owner and guests, both in the interior and on deck. The surrounding environment near M/Y Alamshar remains quiescent as turbines operate. The vessel can be piloted from the bridge, flybridge, or main deck with portable joystick. 

M/Y Alamshar demonstrates innovative technology throughout the entire design of the yacht. It represents significant advances in propulsion efficiency, high-speed sea keeping, dynamic stability, acoustics, marine aerodynamics and the interface of operating crew with systems for safe high- speed navigation. The extensive model testing, investigation into propulsion system parameters and concomitant sea keeping research have led to a vessel which is capable of achieving 700 nautical miles at speed in excess of 45-knots at full load, 950 nautical miles at a transit speed of 35-knots, and 1040 nautical miles at 15-knots.


LOA: 49.9 M (164 ft)
BOA: 11.2 M (36.7 ft)
Materials: Aluminium
Engines: 3 P&W ST40M gas turbines
3 R/R 601-KF11 gas turbines
Speed: 45-knots
Propulsion: 3 KaMeWa 112 SII waterjets
N/A: Donald L. Blount and Associates
Design: Pininfarina
Interior: Redman Whiteley Dixon
Builder: Devonport (Babcock)

For more information:

DEVONPORT Yachts Ltd, 
The Docks, Falmouth, 
Cornwall, UK TR11 4NR


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