<tt>From:</tt> <tt>
Guy Lalonde <lalondegc@videotron.ca></tt>
<br><br>
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<DIV><FONT face=Arial size=2>I may have induced the list into error about how to
determine the power ratio of your winches. Thanks to Bob Johns for pointing it
out.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>So for anyone interested here goes.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Some manufacturers winch numbers represent the
actual power ratio and others' only represent a model number. This is how you
can find out the power ratio of your winch and if you have a 2 speed what
is the power ratio of the other speed.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Most manufacturers quote the power ratio of their
winches using a 10 inch winch handle. In stores you will find 8 & 10
inch handles. So if you are using the shorter one your actual power ratio will
be less because you have less leverage.<BR><BR>First determine the gearing ratio
of your winch. Count how many turns of the winch handle it takes to turn the
body of the winch one turn (this is where I made a mistake, I had said it the
other way around in my previous note). If it takes 5.5 turns of the winch handle
to turn the winch body one turn, then gear ratio is 5.5 to 1. If it is a one to
one relationship then your winch is not geared, ratio is 1 to 1, the mechanical
advantage comes only from the difference in the radius of the drum and the
radius of the winch handle.<BR><BR>Then calculate the power ratio:<BR><BR>(gear
ratio multiplied by winch handle length in
inches) divided by radius of the drum in
inches<BR><BR>the drum being the part where the sheet winds around the
winch<BR><BR>If your gearing ratio is 5.5 to 1, your winch handle is 10 inches
long and the radius of you drum is 2 inches then<BR><BR>(5.5 x 10) / 2 =
27.5 to 1 is your power ratio<BR><BR>If you were using an 8 inch handle on the
same winch, your power ratio would be 22 to 1, a decrease of 20 %.<BR><BR>If
your winch is 2 speed, determine the gearing ratio when turning in the other
direction and redo the calculation to get the power ratio for that speed. A lot
of 2 speeds are geared in one direction only and not in the other (1 to 1 gear
ratio). Larger and more expensive ones are geared in both
directions.<BR><BR>Guy<BR>Cyrena #466<BR><BR><BR></DIV></FONT></BODY></HTML>
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