AQUADRIVE VIBRATION CONTROL COUPLINGS

Why fit an Aquadrive?

An Aquadrive system will reduce structure borne noise and vibration by up to 90%. It will reduce overall noise levels by up to 75%. It will end shaft alignment problems on installation, and for ever more!

It will allow the engine to be installed flat, because the Aquadrive allows angles between the engine and the shaft. It will ease problems when re-engining. And it’s a gift when re-engining an older boat.

How does it remove so much noise?

Marine engines traditionally have been coupled directly to the propeller drive shaft, perhaps with a stiff flexible coupling between the two. Most of the vibration is sent straight down the shaft, and the engine mounts can’t do their job properly because they are strained forwards by propeller thrust. So vibration gets into the hull, and vibration equals noise.

The Aquadrive puts free movement between engine and shaft. It takes the propeller thrust straight onto the hull, and allows free movement of up to 25mm between engine and shaft – up and down, sideways, or fore and aft. No vibration goes down the shaft, The mounts are no longer strained forwards by the propeller’s thrust. The Aquadrive allows so much movement that you can even fit special softer mounts on engines of four cylinders or more.

What’s the result?

Modern hulls are made from GRP or steel. Both materials carry noise badly, so structure borne noise is a particular problem. The chart shows just how much noise can be cancelled by fitting Aquadrive.