> Based on my 15 years experience with pulleys up in the redwood
> trees, at 100
> ft plus ft, I strongly recommend using "single blocks" made for sailboat
> use. They are available at boating supply stores such as West Marine. They
> type you want are made from stainless steel and Delrin. They come in all
> types and sizes. The ones I use to suspend my FW 160 m loop have about a 1
> 1/4 in diameter sheave and a swivel top, and are made by Harkin..They cost
> about $20 each. Use cheap pulleys from hardware stores at your
> own risk as I
> guarantee you in a few years, those cheap plated pulleys will be rusted
> tight and useless, and it is very expensive, as I'm sure you
> know, to hire a
> tree climber every few years to replace rusted pulleys. I don't claim to
> have come up with the idea of using sailboat hardware, I learned it from
> others years ago, it made sense to me, and has proven to be very good
> advise. GL, 73, John
>
>
Another thing to worry about with the cheap pulleys from hardware stores is
the play in the pulley or sheave in the frame. If there is a lot of play in
the sheave and the line doesn't 'fill' the groove, there's a chance the line
could get wedged between the sheave and the frame.
73,
dale, kg5u
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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