Control Line Kit

[Owen Harren]

Afternoon everyone,

My little company has become a distributor for Marlow Ropes and I was thinking of building a few kits and starting with what I'm naming the control line kit which would be traveler lines, mainsheet and vang.

I wanted to gauge interest and if there are other packages we can review.

If you want a spool of line and configure yourself, I can support that as well.

Please just send me a message with interest.

Thanks,

Owen

[Dennis Boyd]

Owen, 

Well Jaywalker is a boat store queen.   We are always looking for something.    I will P. M. you.

Just were are you located?    I think given a competitive choice I rather buy from you than a big box.    I really enjoy and use Marlow splicing kits and tools (I love the splicing tape).    And I upgraded all my MC and E Scow control lines with Marlow products (sold them for J/42)   

I have been an Endura fan boy, so maybe you can pitch us on advantages, and where Marlow shines?

Dennis

Jaywalker

J/42  #6

[Michael Moradzadeh]

I could be interested in such a thing for my J/40

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[Wayne Cassady]

Same here for J40 Southern Cross.

Sent from my iPhone

On Jun 9, 2026, at 7:57 AM, Michael Moradzadeh <m...@yachtpc.com> wrote:



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[Owen Harren]

Hi Dennis,

My company is called Acceleration Engineering (dv/dt the intersection of speed and time for the nerds out there) and we are located in MA.  Much of our work is in the defense and aerospace industry.  Our expanding manufacturing is where a previous post I made about what parts could we use as a community stemmed from.  We have a few commercial products to be released soon and if you are a fan of spirits and wine (just guessing sailors here) check out this video of prototype revision 1  Aeris Preserved. We are about 6 weeks from releasing the first batch of product.

I see the posts about hinges and stanchion bases and I need that stuff as well but just a little time to clear my backlog however, needing lines and a partner that can support the defense industry I researched some of the main names and Marlow is motivated to support small business, was very customer focused, I made becoming a distributor reasonable, I moved forward with the application.  I've used / have Endura and NER on my boat and I don't have anything negative to say but, also have Marlow line and there are advantages to availability, configurability and are of quality as they make lines for also rock climbing and the defense industry.

Appreciate everyone's engagement and check out the video above and ask any questions!

[Dennis Boyd]

Owen, 

On topic of lines.    On the control line kits.     Can I add to the wish list?  

I would like to reinstall a lazy jack system.  I looked on line and I have lots of ideas, but I would be interested in knowing what a kit might look like.   Before I begin to build one from scratch, maybe your company might have an option?    

Second line kit I would be interested in is a end boom, to bow preventor, with a link/connector at mast.      I have been reading John Harries  "Attainable Adventure Cruising" web page on the topic.   He goes to great lenght on detailing how to build one.   I guess before I build one from scratch, I would be interested if this is something you might offer?   He has a excel model that calucates loads and lines sizes.    The model is recommending at least 7/16 Endura for a breaking strenght of 14,900 lbs for J/42 main sail area with end boom to bow set up. 

Wondering what Marlow line offering or suggestions would be for these applications? 

Dennis

J/42  # 6 

Jaywalker

[Owen Harren]

Hi Dennis,

I'll take a look and get back to you on specific recommendations but for something like the boom presenter if you had length measurements that would help as purchases are buy the roll so the question is, what other uses can the line pair with.

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[Dennis Boyd]

Owen, 

Good question.    My jib sheets are 65 ft.  My 1st guess is about 80 +/- ft, maybe more?    The preventor needs to go from cockpit winch to bow, across bow (double blocks from one side to the to split the load idealy) and back to mast.  Need to create a spliced eye at that mast end.  Then a second shot of line need to go from mast to end of boom, with spliced eyes in both ends.   J/42 boom is 18 ft,   so I am thinking it about 80 foot.  Harries suggest one for each jibe, but I think starting out I could get away with just one.   I would need to mock it up to confirm,   I have been playing with some scrap line now, just to have one.   but I don't have 80 ft scraps of 15K breaking strenght  line laying around.   Lots of old 1/2 inch 10K poly on poly, which is not recommended. 

Dennis

[Al Goethe]

For the preventer system on my J/46 I have a length of spectra that is permanently attached to the back of the boom (at the bottom) and when not in use runs forward past the vang with an eye spliced into the end. I have a piece of heavy duty shock cord attached to the gooseneck, that runs back and hooks into the spectra with a plastic hook to keep it snug under the boom. 

For the second part of the preventer I have a control line that has a Tylaska shackle at the end. When not deployed, the Tylaska is attached to the life line at the bow then runs through a snatch block attached to the bow  cleat and back across the cabin top through the organizers to a cabin top clutch. 

When I have to deploy the preventer I simply unhook the shock cord and connect the Tylaska to the spectra. That only takes seconds. But it is important to make the spectra long enough do that you can reach the mast end of it when the boom is all the out! That’s when you need the preventer! 

Connect the preventer as far forward as possible! And don’t connect it to the tow rail. The forces can be pretty big!!

Al Goethe

On Jun 28, 2026, at 14:38, Owen Harren <oharre...@gmail.com> wrote:



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[Todd Stevens]

I’ve also got a length of dyneema running the length of the boom with eyes on both ends.  Endura would probably be better.  The bungee hook does sound  like a good idea. I’ve been using an abandoned cleat found on the boom.  For the forward leg, I’ve been using a line that runs from the cabin top winch to a snatch block on the bow roller and back with a tylaska shackle on the end - AKA, the spin downhaul.  I suppose some day the preventer should get its own block because I might want to use both of those functions at the same time.  

Obviously with this simple setup, one has to re-rig it after a gybe. And clearing it away becomes part of the “prepare to anchor” checklist. 

Sent from my iPad

On Jun 28, 2026, at 13:56, Al Goethe <ankg...@gmail.com> wrote:

For the preventer system on my J/46 I have a length of spectra that is permanently attached to the back of the boom (at the bottom) and when not in use runs forward past the vang with an eye spliced into the end. I have a piece of heavy duty shock cord attached to the gooseneck, that runs back and hooks into the spectra with a plastic hook to keep it snug under the boom. 

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[David Jade]

We have a very similar setup on our J/46. We use low friction rings instead of snatch blocks though. As Al said, the loads can be huge and it’s easier (and cheaper) to find a really beefy and rated low friction ring on a Dyneema strop than a heavy duty snatch block. We used the John Harries Excel worksheet to size everything.

 

As for one vs two lines on the boom, we have one and I don’t mind switching it for gybes. We made our the preventer sheets long enough so you can release the preventer tension, gybe, and then switch control lines on the other side after the gybe. But be careful – with the J’s and their Dorades and dodger, etc… it’s easy to wrap a loose preventer line around something in the dead of night and not realized it. But having only one to worry about makes that a bit easier.

 

David             _/)

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J/46 Shadowfax

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[Dennis Boyd]

Well,  what David, Al, and Todd are describing is exactly the direction I am going, and I've been following,    The trick is to get everything size right.  I gave up trying to find a dyneema loop to connect the two lines at the mast, and decided to follow John Harries suggestion to just use a Tylaska J lock shackle, with a bit of hose, to cover it when stowed with bungee on boom.   Also, sounds like using only one would work.   

I appericate everyone's feedback. 

 I just was thinking what rope control projects I have on tap and if any of them would make sense for Owen to consider.

Dennis 

[Owen Harren]

Morning Dennis,

Reviewing the load requirements and desire for low stretch I'd recommend the D2 Racing line.

What I'd recommend since you need about 160-200 feet is to consider a full roll leaving some for any other projects.  I could have it drop shipped to you.

Let me know your thoughts on that and if that sounds reasonable, we could talk the details such as color and cost.

[Dennis Boyd]

Owen, 

Thanks.   I will PM you to discuss

Dennis

[Owen Harren]

Also (anyone) feel free to email me ow...@dvdtengineers.com as well.