Results 1 to 16 of 16
  1. #1
    Join Date
    Aug 2009
    Location
    Cape Town
    Age
    46
    Posts
    99
    Thanked: 233

    Default Dynema for winching boat

    we have a butt cat, +_ 2.5t. we have a T max 9000 winch currently with steel cable, a warn 9000 also steel cable and a spare come up, also steel. they are mounted 1 on a tractor, 1 on a trailerr, and then a spare, as the boat is too big to hand winch so if a failure, we need to be able to make a plan.

    I am considering putting dynema on the winches, for safety, as well as ease of use, and the steel is prone to rust so hence the dynema.

    What dia/ strength dynema should i get? And what sort of length can i fit on the winch?
    I guess with the dynema it is NB to ensure there is no chafe happening over a sharp point on the trailer that could lead to damage to the rope.
    what is the set up with the dynema to the hook?

  2. #2
    Join Date
    Sep 2006
    Location
    Plett
    Age
    57
    Posts
    5,060
    Thanked: 4164

    Default Re: Dynema for winching boat

    I have this on my Rhino 9500lb, 25m standard on the winch. Been running it for coming up to 4 years and used a lot on the beach. No issues. Same hook as the steel winch. Attachment looks like this.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_5136.jpg 
Views:	44 
Size:	46.3 KB 
ID:	704513  
    2022 Defender D300HSE
    2022 Isuzu Mux 4x2 LSE
    2019 FJ Cruiser
    BL Kewer 3188
    Fusion 17

  3. #3
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    53
    Posts
    1,817
    Thanked: 2839

    Default Re: Dynema for winching boat

    One will often find that Dyneema is extremely abrasive resistant. Often more than steel. Obviously should there not be sharp edges where its used. An interesting thing is the difference between the roller style fairlead for steel cable and the aluminium hawse fairlead for synthetic rope.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

  4. #4
    Join Date
    Mar 2015
    Location
    New Germany
    Age
    53
    Posts
    2,165
    Thanked: 1894

    Default Re: Dynema for winching boat

    11mm x 28m what I use on my winch
    2002 Defender with 300TDi VNT modified
    2005 Defender TD5 CR VNT turbo, Ashcroft lockers,HD CW&P, HD side shafts & CV and Pegged, 35” coppers STT pro ………..and more

  5. #5
    Join Date
    Feb 2008
    Location
    Magalieskruin Pretoria
    Age
    53
    Posts
    2,306
    Thanked: 3235

    Default Re: Dynema for winching boat

    So you have a 9000lb winch, just over 4000kg in working strength of the first layer on the drum. 11mm rope is way north of 10000kg break strength. Your winch will fail, overheat, battery might die way before anything happens with the rope/cable.

    Anything bigger than 8mm rope on such a small winch is overkill. 8mm is 6800kg MBS. Bigger diameter means less rope on the drum.

    I see more boats being trailered with steel wire rope than dyneema. I also see more dyneema ropes breaking while boats are being loaded. Only steel cable I have seen break was the 6mm that was on a handwinch.
    HENK


  6. The Following User Says Thank You to Henkus For This Useful Post:


  7. #6
    Join Date
    Feb 2008
    Location
    Magalieskruin Pretoria
    Age
    53
    Posts
    2,306
    Thanked: 3235

    Default Re: Dynema for winching boat

    And just for interest sake, this rope was used for retrieving a ski boat only. It failed as the heat radiating from the brake on the drum went beyond the melting point of plastic. Remember, dyneema is just a fancy name for plastic that went to Michael House and not a model C school.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Melted plasma 02.jpg 
Views:	53 
Size:	388.0 KB 
ID:	704535   Click image for larger version. 

Name:	Melted plasma.jpg 
Views:	48 
Size:	384.2 KB 
ID:	704536  
    Last edited by Henkus; 2023/11/13 at 05:35 PM.
    HENK


  8. The Following User Says Thank You to Henkus For This Useful Post:


  9. #7
    Join Date
    Aug 2009
    Location
    Cape Town
    Age
    46
    Posts
    99
    Thanked: 233

    Default Re: Dynema for winching boat

    Thanks Henk, so you are saying rather stick to the cable.

    Maybe a decent set of leather gloves for working the cable.
    The stuff is expensive, and if it wont last, stick tot he known materials. weight isnt our problem at all as the boat is only towed 1.5km.

  10. The Following User Says Thank You to adamgweba For This Useful Post:


  11. #8
    Join Date
    Oct 2011
    Location
    Kempton Park
    Age
    50
    Posts
    5,380
    Thanked: 4246

    Default Re: Dynema for winching boat

    I read on this forum that the usable load of snatch straps reduce significantly if they are wet (I think 50%). I wonder if the same is true for Dyneema, and if that might be the cause for many of the reported breakages?

    Also I suspect that winches run for much longer periods when hauling out boats than they do in most 4x4 recovery situations?
    Beat-up rat rod of a '96 Nissan Patrol that bears the evidence of many wonderful adventures (and a few stupid indiscretions).

  12. The Following User Says Thank You to Peter Connan For This Useful Post:


  13. #9
    Join Date
    Jul 2011
    Location
    Durban
    Age
    59
    Posts
    5,683
    Thanked: 1905

    Default Re: Dynema for winching boat

    I have had 11mm Dynema on my boat winch for 10 years, its an overkill I know but I will never go back to a steel cable. Many years ago a mate of mine imported some of the first rolls of Dynema into SA for use in the fishing industry and I had 4mm Dynema on my hand winch for my 14'6" Ski Vee.....guys on the beach couldn't believe it
    FJC - Just Cruising

  14. #10
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    53
    Posts
    1,817
    Thanked: 2839

    Default Re: Dynema for winching boat

    Quote Originally Posted by Peter Connan View Post
    I read on this forum that the usable load of snatch straps reduce significantly if they are wet (I think 50%). I wonder if the same is true for Dyneema, and if that might be the cause for many of the reported breakages?

    Also I suspect that winches run for much longer periods when hauling out boats than they do in most 4x4 recovery situations?
    One problem that I saw (on yootube) wrt dyneema ropes on winches, is that since the cable/rope isn't guided during a recovery, such rope doesn't lay neatly next to each other. Also, thension on the rope is not the same for every revolution and layer. Wire rope (steel cable) has more of a tendency to lay neatly next to each revolution and layer. So the dyneema bundles up and sometimes gets pulled extremely tight over and into previous layers and that cause failure of the dyneema rope.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

  15. The Following 2 Users Say Thank You to Spiceman For This Useful Post:


  16. #11
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    53
    Posts
    1,817
    Thanked: 2839

    Default Re: Dynema for winching boat

    Quote Originally Posted by dirtshark View Post
    I have had 11mm Dynema on my boat winch for 10 years, its an overkill I know but I will never go back to a steel cable. Many years ago a mate of mine imported some of the first rolls of Dynema into SA for use in the fishing industry and I had 4mm Dynema on my hand winch for my 14'6" Ski Vee.....guys on the beach couldn't believe it
    I read on the net that dyneema rope don't last as long being outside in the elements (sun) on a spool/winch. Whats your opinion?
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

  17. #12
    Join Date
    Mar 2015
    Location
    New Germany
    Age
    53
    Posts
    2,165
    Thanked: 1894

    Default Re: Dynema for winching boat

    Quote Originally Posted by Henkus View Post
    And just for interest sake, this rope was used for retrieving a ski boat only. It failed as the heat radiating from the brake on the drum went beyond the melting point of plastic. Remember, dyneema is just a fancy name for plastic that went to Michael House and not a model C school.
    the Dyneema that I got from the UK is totally different from what I seen in SA
    there might be a difference in Dyneema and synthetic rope that is sold in SA as so called Dyneema
    2002 Defender with 300TDi VNT modified
    2005 Defender TD5 CR VNT turbo, Ashcroft lockers,HD CW&P, HD side shafts & CV and Pegged, 35” coppers STT pro ………..and more

  18. #13
    Join Date
    Mar 2015
    Location
    New Germany
    Age
    53
    Posts
    2,165
    Thanked: 1894

    Default Re: Dynema for winching boat

    Quote Originally Posted by Spiceman View Post
    I read on the net that dyneema rope don't last as long being outside in the elements (sun) on a spool/winch. Whats your opinion?
    It is UV treated but like anything sunlight will brake it down over time, when not in use needs to be covered, if I don’t use my winch for long times I remove my Dyneema and store inside, when on winch I made a ally cover to protect from sunlight

    11mm Blue Dyneema® Winch Rope comes ready rigged with a hook and thimble and can be made with a terminal or tapered end as required.

    • Rated at 12.6T, (27,720lbs) this rope is ideal for 9,000, 9,500 and 12,000lb winches.
    • An immensely strong 12 strand synthetic winch rope made from Dyneema® SK78 High Modulus Polyethylene Fibre.
    • This creates an incredibly robust, strong and lightweight safer alternative to wire rope.
    • After manufacturing the 12 strand rope, it is heat set under tension to ensure durability, uniformity and maximum strength.
    • Very light easy to handle very strong.
    • Easily spliced does not kink or curl up like wire rope.
    • It floats.
    • Less effort in use does not kink or curl, safety in use.
    • No more wire rope ‘spikes’ to catch in the gloves.
    • A lot lighter and safer than a wire rope.
    • Ideal for extension winch ropes as well.
    • If it did break, like any wire rope could do in a ridiculous Scenario, Dyneema® Bowrope will not flail. A very important safety feature.
    • UV stabilised giving the rope a long and safe working life.
    • Very durable due to its good resistance to both mechanical and environmental attack.
    • Another reason to use Dyneema® Bowrope is that it stretches very little, even under full load.
    • Dyneema® is a registered trademark of ROYAL DSM N. V. and is produced in accordance with ISO 2307:2019
    Last edited by clivemd; 2023/11/14 at 10:34 AM.
    2002 Defender with 300TDi VNT modified
    2005 Defender TD5 CR VNT turbo, Ashcroft lockers,HD CW&P, HD side shafts & CV and Pegged, 35” coppers STT pro ………..and more

  19. The Following User Says Thank You to clivemd For This Useful Post:


  20. #14
    Join Date
    Dec 2008
    Location
    Pretoria
    Age
    55
    Posts
    6,477
    Thanked: 7916

    Default Re: Dynema for winching boat

    Quote Originally Posted by adamgweba View Post
    the boat is only towed 1.5km.
    That is a long winch...
    "K.a.k Wheeler

    2006 Jeep Grand Cherokee 3.0 CRD - 399000km and permanent member of the family
    2014 Jeep Wrangler JKU 3.6 - no lift kit and smaller wheels.

  21. The Following 3 Users Say Thank You to Rainier Vermaak For This Useful Post:


  22. #15
    Join Date
    Aug 2012
    Location
    George
    Age
    48
    Posts
    2,580
    Thanked: 1220

    Default Re: Dynema for winching boat

    Speak to the guys at Southernropes. They are in your valley and supply to the marine and rigging industries. They should be able to provide you with good advice.

    Remember that Dyneema is just one brand of Ultra-high-molecular-weight polyethylene (UHMWPE). There are specific ropes for specific applications with all sorts of different weaves, sheathing, strand thickness etc.

    From my experience with using it on a sailing dinghy (i.e. not winching):
    • Soft and pleasant to work with. You don't have heavy, hard coils that want to whip you in the face or take your head off when they snap.
    • 5-15 times stronger than steel for the same diameter.
    • Light and it floats.
    • It is more susceptible to UV degradation than steel, but then it does not rust on the inside where you cannot see the damage. (For example, for standing rigging on yachts - the lines that hold the mast up - it is recommended to replace steel shrouds every ten years because corrosion cannot be measured or observed. Rope degrades from the outside, so you replace when it starts to look weak.)
    • Rope does stretch. That should not matter when winching.
    • You can splice (put in eyes, loops and thimbles) yourself with very basic tools. No special pliers and crimping tools necessary. That alone makes it cheaper than steel, even if the cost per length is slightly higher.


    So, UHMWPE is not the perfect solution for all applications, but I would explore the options carefully before using steel.

    Edit: I typed slower than Clivemd.
    Last edited by JanB; 2023/11/14 at 10:49 AM.
    Tyrannosaurus R5 (sold) and now on my second second hand D4 British Tata.

  23. The Following 2 Users Say Thank You to JanB For This Useful Post:


  24. #16
    Join Date
    Jul 2011
    Location
    Durban
    Age
    59
    Posts
    5,683
    Thanked: 1905

    Default Re: Dynema for winching boat

    Quote Originally Posted by Spiceman View Post
    I read on the net that dyneema rope don't last as long being outside in the elements (sun) on a spool/winch. Whats your opinion?
    The sun stuffs everything up so mine is covered with a canvas bag.....I find the biggest problem with the smaller diameters is that it cuts/binds in when layering, that's why I went with the 11mm.
    FJC - Just Cruising

  25. The Following 2 Users Say Thank You to dirtshark For This Useful Post:


Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
  •