Rope Cutters

[Tranona]

Compared to the Stripper ... I think the gap is insufficient to allow the rope to drop in and get trapped / cut ...

The Stripper has tapered cutter blades specifically to allow the rope to get into the cutting area ....

Yes and crucially one blade is not fixed so it is not a scissors action.

That is a poor installation as there is insufficient gap between the cutter and the P bracket to allow water flow through the cutless. should be minimum of 15mm.

 

[Bandit]

I have had them on my Aquastar 48 for about 14 years we have also fitted them to many customers boats, yes they have worked on my boat.
Very efficient from a drag point of view. Negligible to no drag. The drag is effectively thr cross sectional area of your thumb in line with green water flow.
Simple.
Robust.

You need a quick cutter set, a nylatron thimble made to measure, it is normally a boatyard job to machine the thimble to size and fit. At the same time it is wise to drill prop boss to take a custom prop puller and to use rubbing paste and blue the prop to the shaft when you refit the prop.

Most other rope cutters cause significant drag at 16 knots and above think 0.5 to1 knot. Think what percentage of your fuel burn that is.

Some others cause significant cavitation to the prop.

 

[Jerbro]

Yes and crucially one blade is not fixed so it is not a scissors action.

That is a poor installation as there is insufficient gap between the cutter and the P bracket to allow water flow through the cutless. should be minimum of 15mm.

Thanks for the feedback.. I guess these are the kinds of products that you only know if they don’t work, not if they do. It fits my criteria of being better than nothing (according to the ybw review at least), and not having to drill into the p-bracket etc.. I’m a fan of keeping number of parts that live under water to a minimum. Ref. the gap, I think there is room to increase it, but according to the specs of this, and the other similar disc types I researched, they all recommend a minimum of 6mm (this one, the prop protector one and the R and D rope cutter).. I have a 10mm gap so I’m ok with it.. I haven’t noticed any performance degradation as I’m trawling around at 8-15 knots most of the time anyway (1500-2500 rpm at the prop through my 1:1 ratio gearbox!)

 

[Bouba]

Thanks for the feedback.. I guess these are the kinds of products that you only know if they don’t work, not if they do. It fits my criteria of being better than nothing (according to the ybw review at least), and not having to drill into the p-bracket etc.. I’m a fan of keeping number of parts that live under water to a minimum. Ref. the gap, I think there is room to increase it, but according to the specs of this, and the other similar disc types I researched, they all recommend a minimum of 6mm (this one, the prop protector one and the R and D rope cutter).. I have a 10mm gap so I’m ok with it.. I haven’t noticed any performance degradation as I’m trawling around at 8-15 knots most of the time anyway (1500-2500 rpm at the prop through my 1:1 ratio gearbox!)

I mostly go at six knots…but if I am going a long way I do ten

 

[westernman]

I mostly go at six knots…but if I am going a long way I do ten

And that is in the Tesla.