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Discussion Topic: Direct or Hydraulic drive to prop, which is best
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Captain-Joshie |
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Hi All
As you may be aware ‘Blue Skies’ is up for sale at Riverside Boat Sales as we want to get a Hampton Safari 25or Bounty/Broom/Dawncraft 30. Well having always previously owned boats with outboards and as even I wouldn’t think of fitting an outboard to a Hampton, it would mess up the stern on mooring capabilities a bit I think  . I have now 5 boats to choose from! But my question relates to the drive method Direct or Hydraulic, which is best, what are the advantages/disadvantages of each system? Also I’ve always used petrol before, trust me to change when ‘Red Diesel’ is about to be phased out  , what is the cost of Red Diesel and who provides the best quality and lowest cost on the Broads.
Also anything to beware of when buying a Hampton Safari 25 or Bounty/Broom/Dawncraft 30 I should be on the lookout for?
John
http://www.riversideboatsales.co.uk/viking.html
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kfurbank |
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Mardles sometimes
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Hi John,
I can not answer your question about drive, but on the Northern system then without doubt I would use Boulters for diesel, cheapest and I've never had a problem with the quality. As far as I know, the government has yet yo put in place the framework for switching over from Red diesel and therefore diesel is still at the old price until this happens, which is likely to be mid to late Summer. I guess the best thing to do, will be to keep the tanks as topped up as you can throughout the course of the year.
Keith
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billmaxted |
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It all depends with a shaft there is less to go wrong but with the others it is almost certain the the engine will be outside the cabin so it will be quieter.
Bill...
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B17 |
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Hi John,
Hydraulic drive
Disadvantages.
A definate loss of power on the engine (lower top speed ) and a slower response time.
Much more bits to go wrong, Hydraulic pump motor pipes etc.
Advantages.
Due to the fact that the diesel engine can be situated remotly from the shaft these are often situated outside the accomodation (DC 30 Calypso etc) which makes them a lot quieter in use.
I had a hydraulic drive Calypso for a number of years and the diesel was mounted transversly under the rear boarding area along with the hydraulic tank pump etc with the actual drive unit underneath the flooboards in the rear cabin. She had a Perkins 4108 which is not the quietest engine on the planet but because it was outside the accomodation and she was fwd drive made the noise level when cruising very good.
I must also add that in the 6 or more years we had her we did not have any problems with either the engine or the hydraulic system.
One of my friends now has a Bounty with hydraulic drive and previously a DC 30 and I dont recall him having any probs with his either.
With the boats that You have listed I would say that it may be wothwhile looking at a few Calypsos as well as they are a similar price to the DC 30's.
Fuel
Ludham Bridge and Sutton Staithe are also very good price wise for fuel on the Northern side . Keith has already mentioned Boulters.
Good luck with the hunt and I can definatly recommend the Calypso If you are looking at this particular style.
Rod
You mean the other Starboard then...
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BroadAmbition |
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Blimey how long have you got?? Condensed version -
With Hydraulic drive there is basically one HUGE advantage, that of being able to site / tuck the main engine out of the way in areas that are impossible for shaft drive, and that is it.
Now then the disadvantages, Hydraulic drives are heavier than a gearbox, they also generate a fair amount of noise / heat. The biggest disavantage (for me anyway) is that they are not maintainance free and they invarably wear out and develop oil leaks, then they start to pong of hot oil! A good method to use is that of
'The less there is and the less gadgets, then the less there is to go wrong'
The choice is of course down to yourself, try speaking to Jason Hatch at SOS24:7 (Also a member of this site). - Griff
One of these decades we WILL finish Broad Ambition !!
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BOATERS |
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Hi,we have hydraulic drive on our Bounty 28 and find it smoother than our last boat which was shaft driven from the engine which was under the saloon floor.This engine is mounted across the rear of the boat outside the cabin and so are the smells of oil etc which go with it .So far no problems we would look for this on any future boat.
See you down the river,
Roy and Diane
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doninicaz69 |
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we have got hydraulic drive on our bounty 34 and have had no problems in the six years we have had her you must not forget to grease the grease nipple by the shaft coupling on some systems our friend john cressy of maffett cruisers showed us recently we had no idea it had one and had been cruising for five years without greasing it
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PeteSanders |
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There are commonly two different types of hydraulic drive in use on Broads boats, with a degree of difference between them. Both use a pump attached to and permanently driven by the engine, a valve block to provide forward and reverse flow, and thus gears, and a motor attached to either a propshaft, or if mounted within the keel, directly to the prop.
Low pressure and high flow type system usually uses a geared type pump and a vane type motor. The geared type pump (Dowty) is usually responsible for the familiar whine associated with hydraulic drive. this system gives the impression of a degree of "slip", and thus loss of power between engine and propeller.
High pressure and low flow system uses a piston type pump attached to the engine, a similar valve block for the gears, and a piston type motor. There is negligible slip with this type of system, transferring more power between engine and prop, and it is much quieter in operation.
Both systems allow the engine to be mounted remotely from the prop, even outside the accomodation and offer a more vibration free operation than conventional drive using a gearbox, as the engine runs smoothly in its rubber mounts independantly of any vibration transmission from the prop or shaft.
Having owned both a safari and currently a Bounty 30, both of which have had new engines and drives, my view is that the hydraulic drive is preferable, but this is of course a matter of personal choice.
Pete
Can we all move on now please ?
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BroadAmbition |
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Move on? Where to?
IMHO I was under the impression that John was after views / advice from this great forum to guide him in his choice.
I Didn't realise that a forum regular could decide when enough posting had been done on a given thread /subject. Just goes to show I learn something every day. - Griff
One of these decades we WILL finish Broad Ambition !!
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AdnamsGirl |
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Mardles sometimes
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Hi
I think that is actually Pete's signature phrase rather than a request aimed at this thread.
Carol
http://www.broadlandmemories.co.uk
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Mar-17-2007 @ 11:39 AM
Mar-17-2007 @ 11:44 AM
