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  1. #1
    Join Date
    Jan 2007
    Location
    North Melbourne
    Posts
    1

    Default Winch post angle

    Hi guys, sorry if this is a over simple question.

    I need to fabricate a winch post to go on the draw bar to be used to drag large rocks up loading ramps into the back of a 9x5 tandem trailer. A 3200kg rated wire rope puller will be used, to move rocks up to a tonne. I estimate the wire rope puller will be about 1000mm up the winch pole. I was planning on using 10mm plate bridging the draw bar diagonals, u bolted on with M16 gal bolts, and a 50x100x5 RHS post with some form of gusset or reinforcement where it is welded to the plate.

    I am wondering about the physics of the winch post, which at least with boat trailers are mostly angled backwards at 60-80 degrees. Does this make the post structure stronger? Or is it simply to make more room for the boat?

    Thanks, Mark.

  2. #2
    Join Date
    Oct 2006
    Location
    Tallahassee FL USA
    Age
    82
    Posts
    372

    Default

    Probably just to make room for the boat.

    Cheers,
    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain

  3. #3
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Hi Mark,
    Personally I'd keep the mounting for the puller as low as possible, as it will be much stronger. Using a snatch block will halve the effort required, easing the load on the post. Should you have to go higher, I'd brace the winch post to the front of the trailer. Any chance of a pic of the puller you propose to use, please.
    Joe, is correct in saying that it's to make room for the boat, otherwise the winch would be almost on top of the coupling, also angled forward, gives more strength to the post, as they are usually braced at the bottom to make it rigid.
    Hope this helps
    Kryn
    To grow old is mandatory, growing up is optional.

  4. #4
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    4,049

    Default

    I would certainly brace the post down to the drawbars on a 45 deg angle. How wide is the gap that the 10mm plate has to bridge inside the drawbar? 10mm may be too light if there is any distance here. You are talking about 16mm U bolts.

    I have built a trailer designed for lifting. It is mainly used for large round hay bales, but has a boom that has been used to lift a 700kg machine. The boom is operated with a long ram jack and there is a 12v electric winch mounted on the mast. An earlier version broke off at the mast mount when trying to lift a large stack of currugated iron. That is when I added the current braces and increased the size of the mast. It did have a single brace and I added 2 more at an angle backwards such as I suggested above.

    One other thing to consider is what will happen to the vehicle while loading a 1 tonne rock. Will you leave the trailer connected? Support the rear of the trailer?

    Dean

  5. #5
    Join Date
    Apr 2002
    Location
    Brisbane
    Posts
    429

    Default

    For what you are doing a winch post as such is probably unnecessary.
    Wich posts on boat trailers exist only because the attachment to the boat is high and the winch post is used to secure the boat.
    The winch post is angled primarily so the winch and the block or roller presents properly to the bow of the boat.

    My recommendation is that you keep your winch and its line of pull as low as possible but giving some clearance from the deck of the trailer.

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

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