slip rings [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>
>there are turbulent sites where the cables can cause a problem but 
>they are rare.
>--
>Hugh


I'm reminded of the only case when I used a cable system instead of 
slip rings. I rebuild an old 32V Jacobs and saved the customer some 
money by eliminating the sliprings (the original parts were missing 
and it also made it easier for me to build the stub tower). I had 
heard that he could expect to unplug and untwist the cables only 
rarely. The location is on a high flat plateau which experiences our 
steady and stable winds with no disturbance. The tail orientation 
consistently confirmed very low turbulence. I felt confident.

We were surprised and disappointed to find that the cable twisting 
was frequent. It seems that the shift of winds, perhaps some 
nearly-daily shift, seemed to always cause rotation in the same 
direction, or whatever might explain it.

It would be good now to ask the manufacturers if they have had 
complaints from particular locations, using cable system. I'm not 
directly involved in this right now, but I pass this on to be of help.

Windy
-- 

Windy Dankoff
    Founder
    Vice President, Technical Development & Training
    Direct e-mail: windy at dankoffsolar.com

Dankoff Solar Products, Inc.
    Wholesale distributor of solar equipment
    Manufacturer & importer of solar water pumps

2810 Industrial Rd.
Santa Fe, NM  87505  USA
(505) 473-3800    FAX  (505) 473-3830
E-mail:	  info at dankoffsolar.com

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