Zoneworks ZW-TRF120 [RE-wrenches]

[sunwise at cheqnet.net]

Baran Galocy wrote:
> 
I plan to use 12'-0" lengths, mounted 8'-0" above ground with 4'-0"
> underground in concrete.  Any advice, warnings, experience would be greatly
> appreciated.

Hey Baran,

Can't help with the tracker itself, as I use Wattsuns up here in WI.  

For an array of this size however, I'd recommend either putting more
mast in the ground or less mast out of it, especially if in sandy soil. 
If in a deep frost zone (and especially in heavy soils), pay attention
to the shape of the hole.  Keep the sidewalls either straight, or better
yet, wider at the bottom than at the top.

When going over six feet out of the ground with this mast/array, I'd
also consider filling the tube with concrete, which increases the
strength by about 30%.  I'm not an engineer, but I'd guess freestanding
eight feet out of the ground is about max for this array and mast.

Kurt Nelson

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