Aluminum Tower idiosyncracy

[george fremin iii]

>>Before it goes back up I want to repair the splits and will surely use SS 
>>fasteners. I will also utilize the 33+ at all the joints - excellent 
>>suggestion by Tom (N4KG).
>
>   ABSOLUTELY DO NOT USE STAINLESS STEEL BOLTS ON YOUR ALUMINUM SELF
>   SUPPORTING TOWER!!  You MUST use GRADE 8 steel bolts.  The shearing
>   stress on a self supporting tower is even greater than a guyed
tower.

Yep - as I pointed out about the cable clamps. 

typical stainless steel   90,000 psi
Grade 5 SAE              120,000 psi
Grade 8 SAE              150,000 psi

The above info is from the Carroll Smith book. 
There is ALOT more info about bolts that is worth knowing - go
buy the book.



-- 

George Fremin III
Austin, Texas C.K.U.    "My theory is that if you can work everything
K5TR                      you can hear on 75, then obviously your're 
512/416-7010              not hearing enough." -- John NT5C
geoiii@bga.com

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