Rope cutter

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Mike k

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I am shortly due out if the water and want to do 2 things in addition to the A/f and anodes, these are fit a new sounder through the hull ( Airmar B60 sourced) and fit a rope cutter. I don't want to take the prop off but favour a bolt on disc type cutter and I am looking for anybody that can recommend a brand/make.
Any info greatly appreciated

Mike
 
Stripper seems to be one of the best they work for me on twin shafts. If you collect it ( them ) from his workshop you can enjoy the steam railway in his garden.

j
 
Mike k said:
Thanks David that was interesting, I have decided to go disc, just out if ease of fit, but wondered if anybody can give them a reference after having one- I am looking at the R and d disc.Thanks for any further insights.
Click to expand...


You do not need to take the prop off to fit a Stripper, although you may have to fit a spacer to the gearbox coupling. Much more effective than a disc as the tests show. Details from www.ropestripper.com
 
The rope cutters such as Spurs, Stripper and the disc type cutters all cause a lot of water drag & disturbance in the flow to the propeller and at 20 on knots this would give about a knot of speed drop. This absorbs a lot of power = so money ie less MPG.

The one that does not cause a lot of drag and disturbance is the Quickutter by H4 Marine of this parish.

See http://www.h4marine.com/QuicKutter01.htm

The Quickutter has a plastic spool running on the shaft and a blade fixed to the P bracket effectively running over the blade.

I have these on my boat for the last 5 years and no problems.

As used by RNLI and I understand Grey Funnel lines.
 
I also have Quickcutters on my Princess v52. They are not cheap or easy to fit so I doubt a diy job. Each prop needs to come off and it is quite an engineering job etc.

Performance wise there is no discernable difference.
 
Re: R and D Rope cutter

Thanks very much for all your help. Just out of interest, my stern tube is cooled through a sea water scoop then piped to the housing then I assume out through the tube, with the R and D cutter being so close to the tube has anyone had an issue with restricted water flow resulting in prop heating up too much?
 
Re: R and D Rope cutter

You need a minimum clearance of 15mm between the bearing and the face of the prop, not just to allow the water in but to also allow for fore and aft movement as you go in and out of gear.
 
Re: R and D Rope cutter

Tranona said:
You need a minimum clearance of 15mm between the bearing and the face of the prop, not just to allow the water in but to also allow for fore and aft movement as you go in and out of gear.
Click to expand...

Thanks tranona, I may not have explained my concern too well, in essence the R and d cutter buts up to the stern tube with a recommended 6mm space and therefore is at the opposite end to the propeller. So there is loads of space between the disc cutter and the propeller but I was wondering if the closeness of the cutter to the tube could be an issue for a water cooled shaft . I believe the cutter has small holes to allow water to pass but interested in whether this is effective enough in practice
 
Re: R and D Rope cutter

Personally would not put it there, although 6mm is enough for the shaft movement. Think you will find your stern tube has a positive water feed from the engine so will need space for the water to exit. If you have that amount of space you will probably have room to fit a proper cutter - which does not need the prop removed but will need a bit of drilling and taping on the bearing housing.
 
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