rack spacing [RE-wrenches]

[William Miller]

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Jay:

First, figure out how much shadowing you are willing to allow.  Our usual 
standard is to preserve full sun from10:00 AM to 2:00 PM on winter 
solstice.  After you decide the hours within which you wish to preserve sun 
exposure, find out what angle above the horizon the sun will be at that 
hour.  Try http://susdesign.com/tools.php or, if you want to do this in the 
field,  download this tool for your Palm 
pilot:  http://home.znet.com/gregbell5/.

Once  you know the sun angle, you need to solve for the right 
triangle.  Height is the vertical height of the shade source.  Adjacent 
angle is the sun angle.  The adjacent side is the inter-rack spacing.  For 
a diagram, got to my resources page and click on Level Ground Trig 
Solution:  http://mpandc.com/resources/resources.html.

How adept are you at trig?  If not so much, Plan A is to chalk this out on 
your driveway.

Plan B is to use a web (http://www.selectsmart.com/darex/triangle.html) or 
Palm tool (http://www.multiology.com/palm/index.htm).

Plan C is old fashioned trig with a calculator.

Good luck and let me know if this helps.

William Miller

PS:  I really recommend the Palm tools.  I can figure out stuff in the 
field that I used to have to put off until I got back in the office.

WM


At 09:51 AM 7/8/2006, you wrote:


>HI All,
>
>Having a memory moment here,
>
>Can't remember how to figure N-S spacing of ground racks.
>
>Thanks in advance,
>
>jay
>
>peltz power
>
>
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