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yamyam
yamyam

Posted: Mon Oct 19, 2015 10:08pm

Post Subject: Ars hydraulic drive

Hi I'm looking at a boat with a Ars hydraulic drive it's a 2002 boat any body got any advise as I've not come across this system at all thanks

Tony-B
Tony-B

Posted: Tue Oct 20, 2015 8:17am

Post Subject: Ars hydraulic drive

Hydraulic drives were/are a very common system on Broads hire boats and ARS is a well known company in the field of hydraulic drives for leisure boats. This drive system has been in common use since the 1970s although I do not think ARS was around then. The advantages of this system are that the engine can be placed anywhere in the boat and at aligned in any direction the design requires. Once the hydraulic motor is fitted there is no further need for shaft alignment for the life of the boat so engine mount changing is easy. Propeller thrust is taken by the motor bearings not the engine mounts as is the case on may boats with gearboxes. There is less likelihood of expensive damage if the prop jambs on something because the pressure relief valve will just open rather than stopping the engine. It often allows an installation that minimises engaging noise for the boaters. There are down sides though. There is or should be an oil filter that needs regular changing, the reservoir holds far more oil than a gearbox. If a pipe fails they spray oil everywhere so the pipes need regular inspections. As the components wear the efficiency will be reduced so increasing fuel consumption, engine revs for the same boat speed and increasing fuel consumption. In any case such a system is likely to return a worse fuel consumption than a boat with a gearbox but if everything is in good condition this is not likely to be hugely significant. Apart from the hydraulic motor that for marine use requires thrust bearings the other wearing parts and hoses are likely to be fairly common in the plant and agricultural world so will be available from a local hydraulic specialist without a "marine" premium. If I was in your position and every thing else was right about the boat it would not be a deal breaker but I would give the boat an extensive test so the system got hot so I could assess the engine revs - boat speed to try to *replaced* the degree of wear in the system. However as the "gearbox" reduction ratio is set by the displacement (size) of the motor and pump it can be difficult to ascertain unless the boat manual gives it. A 3:1 drive ratio will rev faster per boat speed than a 1:1 so it is difficult to accurately assess wear. FWIW I operated fleet of hydraulically powered hire boats in the 1970s/80s and the only major concern was ensuring absolute cleanliness of the hydraulic oil. About 5 years ago I came across one of those boats and it was still going strong. The owner reported no problems and was happy with it.

Jadabean
Jadabean

Posted: Mon Nov 21, 2016 3:37pm

Post Subject: Ars hydraulic drive

Hi - I do not know of any boats with this drive but I know the system very well. The owner of ARS retired a number of years ago and the "book" was taken up by BSP Hydraulics who still use the ARS name - if you need more info you could call them on 01924 332491 - or of course I can help with any questions you may have,

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