Mercury announced this new V12 block in early 2021 . But we had to wait for the Cannes Yachting Festival in September 2021 to test this engine in France. Remember that in addition to a huge displacement (7.6 liters), this engine block is equipped with a fixed power head with the base that turns below. Moreover, this base is equipped with a gearbox (two automatic speeds) allowing to embark very large propellers. With all these technological novelties, the test is exciting.
Quiet and vibration-free
We are on board the RIB. The pilot starts the engine without us even realizing it. It is necessary to engage the air exhaust (in option) so that the noise of the V12 is slightly heard. No vibration is transmitted by the AMS base. It's velvet!
The maneuver to leave our place of the pontoon is done by using the joystick. This one controls the two engines, or rather the 2 bases. Because the 2 engines remain fixed. You have to lean over to see the bases working independently in the water. This is a bit confusing for a user used to steering his outboard and looking behind to see the angle of his motor.
A kick in the butt
Once we were out to sea, we could accelerate. And then, surprise, all the crew members almost fall at the slightest request of the throttle. These engines are a real kick in the butt. Thanks to the enormous torque and the huge propellers (35'), the Bernico, which is 7 tons, takes off instantly. There is no lift-off phase. You really have to hold on tight to avoid falling!
This acceleration is due to the engine's displacement (which generates the torque), but also to the gearbox. Indeed, the ratio of 2.92 at idle goes to 2.50 once the engine is accelerated. The transition from one gear to another is imperceptible. It is impossible to know which gear is engaged. According to the manufacturer, it changes according to the engine load.
A maximum speed of 68 knots
When the maximum speed is reached (6400 rpm), the Bernico reaches the speed of 68 knots with the 2 x 600 hp for a consumption of about 150 l/h per engine. But more than these extreme performances, it is really the brutal acceleration which will mark our memories following this test.
While the Mercury 600 is priced at 80,000 euros, for information, the Bernico RXP14, whose hull has been adapted for this 2 x 600 hp twin engine (but it can also receive 3 x 450 hp) is available at 780,000 euros. The finish and fittings remain entirely custom to suit the customer. This unusual unit will be presented to visitors at the Grand Pavois in La Rochelle from September 28 to October 3, 2021.
