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[jaymac]

   good point arrow 

[Big Ada]

+1... Same handing.
The rear propeller rotating will be pushing, say clockwise
The front propeller will be pulling(in reverse) or anticlockwise.


 

Does a Horse Push or pull a Cart? LOL!

[Brian60]

Hi,

The propellers' would be twin counter-rotating propellers.

http://www.nauticexpo.com/prod/steerprop/transmission-thrusters-ships-z-drive-twin-counter-rotating-propellers-32369-275339.html

Regards

If they are counter rotating like in the diagram how do they pull water through? The blades in the diagram are opposed to each other, therefore aren't they acting against each other? I think I give up on trying to understand this!

[Arrow5]

It pulls when going downhill .  The horse that is.

[hammer]

Brian , forget pushing & pulling.  Just think of moving water or air backwards. So if the screws are on the same shaft they will be the same. With contra rotating props the pitch will be opposite. If you just imagine a continues spiral through the boat, then cut out the middle. This proves both screws will be the same.   

[Brian60]

Thanks hammer that clears it up nicely- I think the answers went adrift when they moved away from my original question and diagram. The two props were on the same shaft not two seperate shafts contra rotating.

[Umi_Ryuzuki]

A drive from Bauer-Modelle

 

[rickles23]

hi,

Re my The propellers' would be twin counter-rotating propellers.

The full size ones are the same as in the photograph.

They do work.

One pulls the water in and the other pushes the water out.

Regards

[Umi_Ryuzuki]

The drive from Bauer, above, is a single shaft, and common rotation.

[malcolmfrary]

Not only are the blades pitched the same, but the blades appear to be symmetrical and not have any curve, so they should perform equally in both directions.