LionessRacing

low friction shroud cover

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Noting that the mainsheet is dragging on the mizzen shrouds when beam -DDW, and with now 6 parts, the friction is more than desirable.

Boom has a reinforced tube that carries the bail, so it would not be easy to simply move that forward and solve the geometry. 

Found these : http://pobcoplastics.com/WearStrips/half-round-full-round-snap-ons.htm

Any experience in trying to use something like these 

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Never used them as a wear strip, but use full-round carbon tubes as shroud rollers for overlapping jibs. Don't be afraid to push on them to install.

 

HW

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2 hours ago, Haligonian Winterr said:

Never used them as a wear strip, but use full-round carbon tubes as shroud rollers for overlapping jibs. Don't be afraid to push on them to install.

 

HW

What do you do to support them at the bottom? put them on a shroud roller ? 
 

These are somewhat loud, the Kevlar would have good impact resistance

Carbon + Kevlar Tubing

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The six parts move at six different speeds but the same tension, so a single rolling element is still going to have sliding in at least five places

If there's sufficient pressure to cause drag, I would expect a "clip-on" wear strip to get spun around the shroud.

Perhaps a stack of cylindrical "beads", no wider than the line, and constrained on each end of the stack to keep the beads from separating ?

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Speaking of geometry, are your shrouds considerably forward of the mizzen mast ? Where is the mainsheet traveller ?

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10 hours ago, Feisty! said:

Speaking of geometry, are your shrouds considerably forward of the mizzen mast ? Where is the mainsheet traveller ?

Mizzen has forward & aft shrouds. Main boom clears forward shrouds by > 3"

If traveller is down and then sheet is eased the sheet rubs the shrouds. If sheet is in, then no chafe. 

Traveler is behind the wheel on the thwartship continuation of the cockpit seats/bridge deck in front of the mizzen. (makes for fun on a gybe, but nice for singlehanding) 

10 hours ago, Feisty! said:

The six parts move at six different speeds but the same tension

 Um, half are moving out/up and half are moving in/down, so a simple roller would not per se be able to hel as it would for a genoa, but a slippery roller might be a solution.

The line speed is generally the same for all six, it's a low stretch line.

One end goes to the 4:1 fine trim, but that's only about half a fall distance allowing a takeup of perhaps 2' in the 6:1
 

 

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Teflon tubing.  McMaster has it.  Go for the closest inside diameter to match your shroud, and the thickest wall thickness you can find. 

Make a long careful slit up the length, then apply to the shroud, with a few turns of tape top and bottom.  Try to twist it firmly round the shroud so it's tight, but not so much that the slit opens up.  It doesn't need to rotate, actually it's better if it doesn't.

YMMV.

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4 hours ago, Moonduster said:

Just get rid of the whole mizzen thing

Heck no, that would be boring. Much more fun to set the Mizzen staysail on a reach and roll over the sloops that owe us > 40 sec a mile

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If the boom only clears by three inches...  Would reducing the diameter of the sheaves get you clearance?  As an inch is a mile, if you only miss with hard parts by three inches!

It might be the only time that a smaller diameter higher rated sheave would reduce friction... Grin.

Other option would be a soft eye on the boom, with a tag line to hold it forward between the current bail and where it wants to be to be in the clear. 

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37 minutes ago, Zach said:

If the boom only clears by three inches...  Would reducing the diameter of the sheaves get you clearance?  As an inch is a mile, if you only miss with hard parts by three inches!

It might be the only time that a smaller diameter higher rated sheave would reduce friction... Grin.

Other option would be a soft eye on the boom, with a tag line to hold it forward between the current bail and where it wants to be to be in the clear. 

Already have downsized the upper block to a 60mm Harken "Element" triple which is pretty low profile. 

Could make the bail shorter... but doubt could totally solve the geometry; issue is when the traveler is down and you want to ease/trim the sheet.

Putting a strap around the boom, akin to a clew strap to hold the sheet would work, could move it farther forward, secondary benefit of decapitating the helmsman if they are standing during a gybe...

Centering traveler works in lighter air, but generally we would ease traveler first and then ease sheet second in puffs, and then take up sheet before traveler, so the friction is innate 

  Had the boom made ~20 yrs back with thought of going to a mid boom traveler at some point, so it's reinforced for a bail to be placed there. That may be the best solution, but would make single handing a matter of steering from in front of the pedestal. 

 

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On 6/4/2019 at 7:26 PM, Haligonian Winterr said:

https://www.mcmaster.com/60485k68

 

They are terrifyingly loud.

 

HW

Those are not robust enough for shroud cover. Lean on them once and they are toast as the wall thickness is too thin.

Try PEX plastic tubing. Bombproof and holds up well in UV. Cheap too.

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5 hours ago, Irrational 14 said:

Those are not robust enough for shroud cover. Lean on them once and they are toast as the wall thickness is too thin.

Try PEX plastic tubing. Bombproof and holds up well in UV. Cheap too.

Not sure what you are referencing. These are used as stops only (on the bottom). The carbon has held up well, but as stated above, would be the wrong material choice for this application.

 

HW

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On 6/5/2019 at 9:44 AM, LionessRacing said:

Heck no, that would be boring. Much more fun to set the Mizzen staysail on a reach and roll over the sloops that owe us > 40 sec a mile

Mizzen staysails = fag tool. Fun is a mizzen spinnaker. 

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We are in “no spinnaker” class.

Staysail is permitted, nearly same area as foretriangle, save the spinnaker for the annual Octoberfest comedy race

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A section or two of Davis snap on cable cover, a roll of electrical tape.

 

if you want to get sexy, an extra wrap of Millionaires Tape.

813A2099-08C1-41F5-955C-873B7AB5DDC7.jpeg

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On 6/5/2019 at 10:44 AM, LionessRacing said:

Already have downsized the upper block to a 60mm Harken "Element" triple which is pretty low profile. 

Could make the bail shorter... but doubt could totally solve the geometry; issue is when the traveler is down and you want to ease/trim the sheet.

Putting a strap around the boom, akin to a clew strap to hold the sheet would work, could move it farther forward, secondary benefit of decapitating the helmsman if they are standing during a gybe...

Centering traveler works in lighter air, but generally we would ease traveler first and then ease sheet second in puffs, and then take up sheet before traveler, so the friction is innate 

  Had the boom made ~20 yrs back with thought of going to a mid boom traveler at some point, so it's reinforced for a bail to be placed there. That may be the best solution, but would make single handing a matter of steering from in front of the pedestal. 

 

If the helmsman gets decapitated while standing during a gybe, is that a bad thing?

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12 hours ago, Varan said:

If the helmsman gets decapitated while standing during a gybe, is that a bad thing?

its a matter of who you ask; to some extent, and as the helm and main/mizzen trimmer are all in pretty much the same space a matter of technique & timing as well. You can sit on the leeward side, and be forward of the sheet, if the trimmer brings it in far enough. Or, if they don't you can get 6 parts and a fine trim tackle smacking you upside the head. Sit on the windward side and the same, but now the falls have more speed. Standing you can actively parry, and try to keep them from being fouled on the pedestal. 

 

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