Murflynn Posted January 13, 2017 Report Share Posted January 13, 2017 (edited) I've been thinking about this and i'm not great at maths. If the boat and trailer weigh 18 tonnes on a vertical 90' drop and the slip is estimated to be 12' . If I divide 18 by 90 and then multiply by 12 then I get a drawbar pull of 2400kg. Have been on net looking at maximum drawbar pull and there is an experiment at Harper Adams with a strain gauge between Land rovers series , 110 Defender , Discovery and a tractor. The traction coefficient for the Defender is between 0.9 and 1.1 of its weight ( accelerator to the floor on a loose surface with limited wheel spin and the tractor already travelling at 1.1mph ). The kerb weight of the Land rover 110 is approx 1930kg. I think that the coefficient will be lower at a controllable speed working on a slip. So I think it's asking too much of a 4wd. ( open to corrections ). I think you mean that the slope is 12' in 90'. The calculations are correct insofar as they give the resistance to moving of a perfect friction-free trailer on non-distorting tyres up a perfectly even slope. We all know that is never the case. I suggest you add a significant factor to cover the need to overcome static resistance ('stiction') before the rig is rolling, friction losses in the wheels, additional resistance resulting from tyre deformation, etc. I would add 50% to be assured my rig was adequate. Edited January 13, 2017 by Murflynn Link to comment Share on other sites More sharing options...
Graham Davis Posted January 13, 2017 Report Share Posted January 13, 2017 There is a table somewhere that gives you the "variables" to add to any formulas to calculate winching loads. It was something I had to look at years ago when I was going to do motorsport recoveries. Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 14, 2017 Report Share Posted January 14, 2017 hello got a 50 ft narrow boat and my own trailer `need to pull my boat up a slipway incline about 12 degrees rise what road car would be strong enough to do this considering just in low gear Have you seen this posting http://www.canalworld.net/forums/index.php?showtopic=89273&p=1944575he didn't have a tractor Link to comment Share on other sites More sharing options...
Murflynn Posted January 14, 2017 Report Share Posted January 14, 2017 (edited) the oil and gas exploration and drilling industries rely on skid trucks that can load and unload themselves. perhaps OP should invest in a big Kenworth. Edited January 14, 2017 by Murflynn Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 14, 2017 Report Share Posted January 14, 2017 the oil and gas exploration and drilling industries rely on skid trucks that can load and unload themselves. perhaps OP should invest in a big Kenworth. texas_bed_side_view_2__large.jpg But there are lots more horses there than in the video I linked to, just a pick up truck. Link to comment Share on other sites More sharing options...
Murflynn Posted January 14, 2017 Report Share Posted January 14, 2017 if you're gonna do a job, do it right, do it big !! Link to comment Share on other sites More sharing options...
tomsk Posted January 14, 2017 Report Share Posted January 14, 2017 Link to comment Share on other sites More sharing options...
Murflynn Posted January 15, 2017 Report Share Posted January 15, 2017 bloody lucky the wall doesn't fall down. Link to comment Share on other sites More sharing options...
MtB Posted January 15, 2017 Report Share Posted January 15, 2017 Who is the music track by? FAR better then the original! Link to comment Share on other sites More sharing options...
Nicktheplumber Posted January 15, 2017 Report Share Posted January 15, 2017 Who is the music track by? FAR better then the original! Have to agree with you . It's by Korn . Link to comment Share on other sites More sharing options...
WotEver Posted January 15, 2017 Report Share Posted January 15, 2017 Who is the music track by? FAR better then the original! I thought exactly the opposite. Link to comment Share on other sites More sharing options...
cuthound Posted January 15, 2017 Report Share Posted January 15, 2017 I thought exactly the opposite. Me too, unless you completely rearrange a classic and play it at a different tempo it will always fail when compated to the original. Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 17, 2017 Report Share Posted January 17, 2017 This was Fox's pulling my boat out at 18 tons, the cooling fan is just in the water. Link to comment Share on other sites More sharing options...
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