[TowerTalk] Guy anchor posts

[jimlux]

On 8/31/20 1:08 PM, Richard (Rick) Karlquist wrote:
> Before worrying about these issues, I would want to be
> sure that the soil will support the load of the guy.
> I went to a lot of trouble to build 12x12 inch "beams"
> consisting of four 2x12's screwed together.  They
> were buried 4 feet deep.  40 meter verticals (30 feet
> long) were mounted on them.  During the rainy season,
> the wind pushed them over at a 45 degree angle.  The
> "beams" didn't fail, the soil did.
> 
> Rick N6RK

I suspect that's the most common failure mode for a post with no 
backstay. All the force is pushing on the top edge of the "hole".  just 
like when you shove a shovel into the dirt and push the handle to bust 
loose the next shovel full.  You'd need a really deep burial to resist 
this, so that most of the force is resisted deep down.

> 
> On 8/31/2020 12:14 PM, Rick Harrington wrote:
>> Given these 2 choices and everything else being equal, which would be the
>> strongest choice for a wooden post to attach a guy wire?
>>
>> a)  2- 4x4 posts bolted together to make a single 4" x 8" post with the
>> eyebolt on a 4" face
>>
>> b) a 6" x 6" post
>>
>> Rick WR0H
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