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Old 22 December 2010, 15:19   #1
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Alternative to Universal joints in outdrives?

I am wondering if it would be possible to make a hydraulic outdrive. i.e. engine to a hudraulic pump. the pump is linked to a turbine via high pressure hoses and the turbine turns the prop thus removing the u.j. Could this system work?

would it be possible to have a hydraulic system that could generate the speed to rotate a prop?

just a thought while I had a moment to spare

your thoughts and observations on the possibilty of a hydraulic outdrive

TSM
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Old 22 December 2010, 15:31   #2
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Like THIS one !!
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Old 22 December 2010, 15:43   #3
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Quote:
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would it be possible to have a hydraulic system that could generate the speed to rotate a prop?
Fossor has this type of drive.

We used this vessel laying seismic cable off the coast near Staithes last year because of its manouevrebility.

There's a propellor tower on each stern corner which rotates through 360 degrees and trims up so the boat can take the bottom.
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Old 22 December 2010, 15:43   #4
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Quote:
Originally Posted by two stroke mick View Post
I am wondering if it would be possible to make a hydraulic outdrive. i.e. engine to a hudraulic pump. the pump is linked to a turbine via high pressure hoses and the turbine turns the prop thus removing the u.j. Could this system work?

would it be possible to have a hydraulic system that could generate the speed to rotate a prop?

just a thought while I had a moment to spare

your thoughts and observations on the possibilty of a hydraulic outdrive

TSM

When i was studying i used to drive a sight-seen boat that had this type of system. The propellers was directly attached to the hydraulic engine. Hydraulic pump was driven by a Deutz diesel. As the engine was inside the drive, in front of the propeller, don't think it was a particularly efficient system, but as it was a low speed displacement boat it did not harm to much. So Yes, its possible but depends on the application if it makes any sense or not?
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Old 22 December 2010, 17:00   #5
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yes, got one in my cruiser.............and you will find me in there too...........

http://www.bountyboats.co.uk/sunbridge30.html
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Old 22 December 2010, 17:11   #6
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Not very efficient unfortunately
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Old 22 December 2010, 17:41   #7
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It was quite common to find this sort of drive retro fitted to give mechanical drive to classic sailing boats due to the fact they couldn't always get the engine where it needed to be for a direct drive to the prop.
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Old 22 December 2010, 17:46   #8
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Fossor
What's under that orange cover?
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Old 22 December 2010, 17:55   #9
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What's under that orange cover?
It's a gun.

It's purpose was to deter Chewy and the Staithes massive from nicking the sonar cable which cost 20k per 100yard section.
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Old 23 December 2010, 02:50   #10
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Not very efficient unfortunately
Hydraulics run at 30% efficient, rest is heat.

Engine runs also 30%.

So thats 30% twice.

Advantage, very high power density, and small sized, when compared to other propulsions.
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