[TowerTalk] Stub mast strengthening

[Bob K6UJ]

Steve,

The sleeve would definitely add strength.  The lateral force from the wind load on an antenna mounted on the mast puts the most stress
at the bottom of the mast, think of a 16 foot lever arm.   I would find out the yield strength of your aluminum mast and do a 
check of the maximum antenna load you should use.  Aluminum has a much lower yield strength than a steel mast so you need to be careful.  
There are calculator programs available to help you figure out the load rating of various mast materials.


Bob
K6UJ

On Apr 16, 2013, at 8:31 AM, GW4BLE wrote:

> I have a question concerning 'sleeving' (can't think of a better way to describe it) -  I have a 16' x 2.5" OD thick-wall aluminium tube that will be used as a stub mast, would inserting 6' x 2" OD thick-wall aluminium  tube into the bottom of the tube add to its' 'strength' in any way or would it just add unnecessary weight?
> Sliding it in makes quite a snug fit, but not exactly 'tight' 
> 
> Steve
> GW4BLE
> 
> Sent from my iPhone 4S
> 
> 
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