Re: Re: Re: 12 volt electric winch

Posted by Steve - IN on February 12, 2003 at 21:21:59 from (12.222.17.160):

In Reply to: Re: Re: 12 volt electric winch posted by george md on February 12, 2003 at 19:10:42:

Now you've done it -- made me dust off old brain cells and think about trigonometry. You're right, the SINE of 45 degrees is 70.7% and the SINE of 90 degrees (straight up) is 100% for which the slope or Tangent of that angle is infinity.

I think the basic Archemedes type physics stuff is more or less true - or give me a lever and a fulcrum in the right place and I can lift the world approach. As I understood the rating system for electric winches, the pound rating scale meant the device can lift X pounds straight up - the infinite tangent. Made me think about and look up that info too. Seems these things draw mega current when they approach their rated pull, and the current draw climbs in a nice curve or logarithmic fashion. The winch guys point at shortcomings in your battery and alternator. And in practical terms a long ramp with a big load will deflect a bit thus increasing the force required. Getting stuck in a wall of mud says you're facing an infinite tangent - straight up - with a negative mechanical (dis)advantage which is a lot different than a smooth grade, or even straight up.

Given all that, it's easy to see why there are a lot of different opinions based on experience (heck mine has always pulled what I wanted up the ramp I gave it - is my actual experience). So I still stick by my mechanical advantage formula - and notice that the guys who say this and that will or won't work aren't noting what size ramp to lift to what height and how much current they can supply to their winch. Another thing to note is the HP rating of the winch motor versus its speed, and its current draw at rated pull. If it turns out to be 300 amps or so - you know you're going to need a bigger alternator and/or spare battery system. Sorry - life ain't simple.

Steve

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