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  1. #11
    steve45's Avatar
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    Quote Originally Posted by Xspook View Post
    Safe to assume this guy hasn't read through this thread

    Yea, but maybe he's not going very far.

  2. #12
    steve45's Avatar
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    Looking at post #4 again, that doesn't look very secure. Yes, those straps fasten to the metal fender bracket, but those things are easily bent. A lot of trailers have plastic fenders, too.

    In reality, I really don't think any straps are going to hold a large 'Ski or boat in an accident. A 2" wide nylon strap is what they make seatbelts out of to hold a 200 pound occupant inside a car. Put that same strap on a 1000+ pound 'Ski and think it's going to hold? Same with the bow stop. If the boat doesn't go over it, it will just knock it out of the way.

  3. #13
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by steve45 View Post
    ... I really don't think any straps are going to hold a large 'Ski ... in an accident. A 2" wide nylon strap ... on a 1000+ pound 'Ski and think it's going to hold? Same with the bow stop.

    If the boat doesn't go over it, it will just knock it out of the way.
    In a severe collision, the idea is that the hull does not leave the trailer. The trailer frame may bend and twist. The ski just needs to still be attached to and in the general vicinity of the trailer structure when everything comes to a final stop.

    Sure the winch post may fold forward, but if the bow strap is still connected to the frame it should absorb a lot of deceleration energy. Same with the rear straps. Mine are rated for 1500 pound breaking strength (each), so with a 1000 pound hull that is 3 times the deceleration force, plus up to another 1500 pounds of safety strap pull at the bow. Plus the winch bow strap, rated for at least 1000 pounds with breaking strength somewhere higher. Overall the four straps should hang on to several G of trailer deceleration.

    The tow vehicle will be decelerating as the crush zones do their thing, and the trailer behind will potentially buckle if the vehicle ball mount manages to stay attached. All together, if my watercraft are yanked free of my trailer, something very bad has happened.

    Do the best you can with regards to trailer selection, trailer configuration and how well the watercraft is strapped down.

    Some may not have seen this trailer crash test video.


  4. #14
    steve45's Avatar
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    That's a really scary video!

    That said, I think most boat winch straps and tie-down straps are a lot weaker than their original rating. Exposure to sunlight destroys the thread that holds the hooks on the end of the straps. I know I've seen several straps fail while winching boats/PWCs back onto the trailer. It wouldn't surprise me if the straps lost half their initial strength after 2 or 3 years.

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  6. #15
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by steve45 View Post
    Looking at post #4 again, that doesn't look very secure. Yes, those straps fasten to the metal fender bracket, but those things are easily bent. A lot of trailers have plastic fenders, too.

    In reality, I really don't think any straps are going to hold a large 'Ski or boat in an accident. A 2" wide nylon strap is what they make seatbelts out of to hold a 200 pound occupant inside a car. Put that same strap on a 1000+ pound 'Ski and think it's going to hold? Same with the bow stop. If the boat doesn't go over it, it will just knock it out of the way.
    I just did that for the photo, normally it has the seat on and strap goes around frame back to strap
    My fav test is put 1 dollar bill on top of each bunk-under hull next time you tow with angled straps and see if it is still there after the tow..

  7. #16
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by steve45 View Post
    ... I think most boat winch straps and tie-down straps are a lot weaker than their original rating.

    Exposure to sunlight
    ...
    I had not fully considered to what degree sunlight exposure might weaken the winch strap webbing material in the first few years.

    Apparently the strength reduction can be in the range of 30% or more in the first year, for a strap exposed to full sunlight all day, every day. Second year % reduction is not as drastic.

    https://www.cargoequipmentcorp.com/w...-strap-webbing

    https://factor55.com/uncategorized/u...ic-winch-rope/

    I will admit this is a greater strength reduction percentage that I might have guessed, for the first year and then the second year. In my seasonal climate the trailer and winch straps are stored indoors for half the calendar so hopefully the rate of degradation is also less. During the summer season my PWC trailer does sit outside with direct exposure to the sun.

    I had already intended to replace the bow winch straps every few years. Right now those winch straps have been on there for four summers. I have not noticed much color change nor surface roughness (which are indications of strap degradation) but I should more closely compare my on-trailer winch straps with a rarely used entire ‘spare’ winch tower assembly, including a nearly new winch strap.

    Which raises the question - what is the optimal age to proactively replace old winch straps with new?

    I do see lots of trailers with frayed and clearly degraded winch straps, either from many years of exposure or from frequent use. I suspect many PWC trailer owners intend to use their original winch strap right until the day it fails entirely.

    I suppose the same degradation issue affects my ratchet tie down straps. 2” wide Boat Buckle brand. Two straps on the rear of each ski are mostly in shade during the day but the front safety straps are exposed to the same sunlight cycle as the bow winch strap.

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  9. #17
    steve45's Avatar
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    Yes, I think periodic strap replacement will be on my list of maintenance items.

    I was really surprised when I broke a strap on my nephew's trailer hoisting an old STS 750. I don't think those things weigh more than 500 pounds or so.

    We live in a part of the country that has very high UV exposure and it tears up everything. I'm in the process of extending the awning over my toys at our lake house by a few more feet to try to reduce sun exposure.

    I've had a new strap for my boat trailer laying around my shop for a couple of years--time to put it on!

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  11. #18
    When I see such pictures, the first thought in my head is 'OMG, it will be dirty as hell by the end of its trip'


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