THE POWER PLANT

After researching various engine options worldwide, Pacific Hovercraft selected the Hirth 3503, a 625cc 70 HP water-cooled, carbureted engine. This engine produces 57 ft/lbs of torque at 6,000 rpm and offers an extremely flat torque curve. (see graph below). What does this mean? Lower engine speeds, lower noise levels, lower fuel consumption, smoother throttle response and longer engine life.

This engine has an operating RPM range less than conventional 2 cycles resulting in a very smooth and quiet running engine with impressive power. The 3503 incorporates Al-Nikasil coated cylinders for superior performance and reliability.

Al-Nikasil is a nickel based material applied in a paste form, when super heated it becomes part of the cylinder itself. Nikasil coated cylinders have a hardened surface that cannot peel and is more wear resistant that steel sleeves. Al-Nikasil provides for a super low coefficient of friction, reducing engine heat and wear. Since the aluminum Nikasil coated cylinders and pistons expand at the same rate, cold seizures are eliminated unlike other water-cooled engines. This is why Hirth engines can handle cylinder head temperatures over 500° F without failure.

Hirth 3503 Torque Curve

THE DRIVE TRAIN

Another innovation making the Slider the most advanced light hovercraft in the world is it's drive train. Unlike other manufacturers that direct couple the drive system to the engine, Pacific Hovercraft produces and installs their own heavy-duty clutch. This centrifugal clutch is capable of handling over 110 hp, no problem for the stock 70 HP Hirth engine.

The clutch offers easy starting and smooth engagement of the engines power to the drive system. In addition to smooth starting, this reduces the wear on the starter and drive train. Have you ever tried to start your car in gear? Why start your hovercraft in gear?