Presentation

Yacht Class n°23 (dec 2020/jan-feb 2021)

LOMAC

Written by: Philippe Leblond – Photos : Philippe Leblond & All rights reserved

It is extremely rare in the sector of rigid-inflatable boats. For the latest version of the GT 10.5, the Italian shipyard has recently offered, in addition to the standard hull, a special hull designed to carry a pair of the new 375 hp Yamaha XTO V8 outboards, whose formidable power requires a redesigned and reinforced transom. We tried this all-new package at La Napoule. The first model in the GranTurismo range, the GT 10.5, launched five years ago, is a sure value in the large cruising RIB market. As such, it has a real cabin with a large double berth and an independent bathroom with sink, toilet and shower. The decoration based on light oak and the presence of six portholes, including three that can be opened, make this living space bright and airy. On board this type of boat, there is no dressing room, but several cabinets make it possible not to leave personal belongings in travel bags. As with some models of the Adrenalina series, the double berth (183 x 141 cm) can be transformed into twins (183 x 45 cm). This voluminous console-cabin fits at the center of a walkaround deck layout, with wide level walkways allowing easy movement around it. On-board circulation is a strong point on the GT 10.5, with the exception of the rather cramped swim platforms, which do not communicate with each other. Note the open passage in the back of the aft settee, on portside, facilitating access to the swim ladder and the hand shower. Another major advantage of this layout is the two solariums that can be converted into as many saloons. Thus, the large table of the aft dinette, which electrically comes up from the floor, can accommodate eight or ten people on the long U-shaped settee, flanked by the kitchenette equipped with a 75-liter fridge. In the same way, forward, the sunbed extension, convertible into a table, can accomodate up to six guests for a picnic, thanks to the seat located at the end of the cabin deckhouse. As on the Adrenalinas, the polyester base covering the bow houses the anchor and the windlass driving the anchor in the hawse pipe, and there is also the sunshade fitted on the periphery of the aft back seat, and thus do not require an arch. To end our tour, hard to overlook the aesthetic attributes of this limited series, namely the solid teak with light-colored joints, the courtesy lighting and underwater LED, and especially the outstanding leather upholstery, with a quilted, tobacco-colored pattern. The same leather can be found on the cladding of the stainless steel handrails.

The punch of the Japanese V8

At sea, the dynamic qualities are in tune with the aesthetics of the GranTurismo. There is already performance, of very high level once again, with a top speed breaking the 50 knot threshold: 55.4 exactly! The maximum rpm is quickly reached, thanks to the punch of the Japanese V8 that lift off the GT 10.5 (an operative weight of more than 5 tons) in less than 5 seconds and whose thrust is still sensitive above 4 000 rpm. Regarding energy, the two 550-hp Yamaha prove to be particularly fuel-efficient at their most efficient rpm (0.44 mile per litre) with only 47.5 litres per hour. This means that it can travel 223 miles without refueling. And in fast cruising mode, at 4 000 rpm, the GT 10.5 still has a range of 137 miles, at 41 knots please! But, we believe its natural rhythm to be 3 000 rpm, with a speed of 27 knots and a 210 nm range. At the helm, we find the same great nautical qualities as the AD 10.5, but slightly less reactive, with a little more inertia and less sensitivity to the trim, due to its greater weight. In turns, even if very healthy and efficient, it is also slightly less lively. That said, the new hull, approved for the Yamaha XTO 375, provides real comfort in waves and could probably support the XTO 425. A great chase-boat for every destination! 


Max speed : 55,4 knots à 5 500 tr/min with 2 x Yamaha 375 hp

Fast cruising speed : 36,5 knots à 4 000 tr/min

Economical cruising speed : 21,0 knots to 2 500 tr/min

Lifting off time : 4,9 secondes 

Acceleration from 0 to 20 knots : 4,2 secondes

Consumption in normal use : 47,5 l/h à 2 500 tr/min

Range in normal use : 223 milles à 21,0 knots

Technical sheet

Overall length
10,40 m
Width
3,51 m
Fuel capacity
560 l
Material
CR/CSM
Power
maxi : 2 x 375 ch (552 kW)
Builder
LOMAC

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