Pleasure Craft Brochure
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Halyard The Science of Silence Global Support & Distribution w. www.halyard.eu.com e. techhelp@halyard.eu.com t. +44 (0) 1722 710922 Halyard Pleasure Craft Pleasure Craft

Product Index Aquadrive Engine Mounts ANTI-VIBRATION - Aquadrive Bilge Water Filtration Engine Protection Exhaust Alert Sea Strainer Alarm Exhaust Systems Spray Head & Risers Silencers Separators Exhaust Hose & Silicone Bellows & Accessories Noise Reduction Distributors, Warranty & Support An Aquadrive will reduce structure borne noise and vibration by up to 90% as well as reducing the overall noise levels by up to 75% and the shaft alignment problems will cease on installation, as it allows the engine to be installed at. The Aquadrive allows angles between the engine and the shaft and...

Gearbox Adaptor Drive Shaft Thrust Bearing What’s Inside an Aquadrive? The Aquadrive has four main components. The gearbox adaptor is ready made to couple our drive to your gearbox. Behind this comes the Aquadrive special drive shaft, with a tough constant velocity joint at each end. Then the thrust bearing, engineered to take forward and reverse thrust, and rubber mounted to reduce noise. Finally the shaft coupling, produced for a wide variety of shaft diameters. The thrust bearing is incredibly tough and built with races which can be replaced even after many years running. Sealed ball...

How does it solve shaft alignment problems? Marine engines are supported on timber or steel bearers xed into the hull. These bearers are positioned to allow the engine to line up roughly with the shaft. The engine is then adjusted on its mounts so that it lines up with the propeller shaft coupling within a few thousands of an inch. All this takes hours of painstaking work. And then when you launch the boat, or tighten the backstay on a yacht, it all moves slightly and needs to be done again. The Aquadrive changes all the rules. The propeller shaft ts into the Aquadrive’s thrust bearing,...

BILGE WATER FILTRATION WAVESTREAM A development of world-wide importance which prevents oily bilge water being pumped into the sea. All types of boats risk polluting their surroundings when they pump out their bilges. Bilge water invariably contains fuel oil, lubricating oil and grease which cannot be separated and is dumped into the seas and rivers of the world. Legislation to prevent this operates in most parts of the world, and is being progressively tightened. Wavestream has been developed for the oil and shipping industries. XOil is a lter material which bonds with oil. It is processed...

Exhaust Alert ENGINE PROTECTION – EXHAUST ALERT Why fit an Exhaust Alert? Marine diesel exhaust systems are designed to take temperatures of only 120°C. The exhaust gases, however may reach more than 500°C. To cool the gases, the exhaust depends on the free ow of cooling water from the engine. This ow can be cut off, by a plastic bag or seaweed being sucked into the intake or by a problem with the water pump. The exhaust temperature will rise immediately to around 450°C, the exhaust will overheat and may be seriously damaged. In most situations the Exhaust Alert will warn you before serious...

Engine Protection – The Sea Strainer Alarm System Why? Marine engines are cooled by raw sea water, drawn in through the bottom of the hull and pumped through the heat exchanger. Block this vital supply and problems follow immediately. The water pump impeller fails almost instantly and engine overheating follows. In extreme situations really serious damage can be done. Halyard’s Sea Strainer Alarm buys you precious seconds to deal with the problem before any damage occurs. Impede the ow of water through the strainer, or start the engine with the seacocks turned off, and the Sea Strainer...

Exhaust Systems Exhaust Systems Sprayheads/Risers Silencers & Exhaust Systems Why we use Silencers? Noise can be tiring and cause sea sickness. Our objective is to achieve an exhaust noise reduction of around 40% with our basic silencers, 70% with our specialist dual chamber silencers, or 80% with silencers and our exhaust water separation units. Spray heads Many engine manufacturers make a standard spray head for use when a high riser is not needed, if not then Halyard can help. We can also produce spray heads with particular spray patterns for installations where cooling is critical. Lift...

Silencers & Exhaust Systems Designing an Exhaust System The most vital question when designing an exhaust – Where’s the waterline? Engine well above Waterline? The engine is sited well above the waterline, with a gradient steeper than 1 in 8 to the back of the boat. The water will run naturally down the exhaust to the stern. To reduce noise by up to 40% a straightforward in-line silencer should be used. To reduce noise by around 70% a dual chamber unit could also be used. Engine only just above the Waterline? Water could run back into the engine if the vessel pitches with the engine not...

Lift Silencers Round In-Line Silencer Horizontal Lift Silencers These silencers are made from strong lament wound tube, giving the maximum possible protection if the exhaust backres. Every unit is pressure tested before being gel-coated. They must be installed within 5° of horizontal towards the stern. These low lying units can be very useful in sailing yachts, where the silencer needs to be secured alongside the propeller shaft. Oval In-Line Silencer Side In, Top Out Lift Silencer These oval silencers are hand-moulded for use where the round body unit cannot be accommodated. Twin Inlet...

Water Separators Mid-Size Separator The larger separator is designed for use where the generators cooling water ow rate exceeds 40 litres per minute and the generator exhaust is up to 90mm diameter. Individual applications must be checked for correct sizing and it can also be used with propulsion engines. Mid-Engine Separator The mid-engine separator is an easy solution for most engines with exhausts from 90mm upwards. The units are produced using the same proven technology as seen with our silencers, with every one pressure tested. The unit comes with differing body sizes to match a...