[TowerTalk] MAST

[Ken Fisher]

Bob Duckworth wrote:
> 
> David and Ken.
> It's still cutting things close but if that 55mph calculation
> is for a rigid structure there will be a bit
> more margin with a dynamic, nonresonant structure.
> -bob
> wb4mnf
> ----------
> | From: David O. Hachadorian <k6ll@juno.com>
> | To: towertalk@contesting.com
> | Subject: Re: [TowerTalk] MAST
> | Date: Tuesday, October 07, 1997 2:55 AM
> |
> |
> | On Mon, 6 Oct 1997 16:03:24 -0700 Ken Fisher <kfisher@inreach.com>
> | writes:
> |
> | >I have attached a url with a pic of my stacked beams klm 20m-6 with
> | >a klm 40m-4 over it. The mast is aluminum t-6061 3/8 wall 14' sticking
> | >out of the tower. No problems Cost was appx $130 for the mast. Ken
> | >W6FK
> |
> | If that is a 2" O.D. 6061-T6 mast, my calculations predict
> | failure at 55 miles per hour if the wind is in line with the
> | two antennas. You have been lucky so far.
> |
> | Dave Hachadorian, K6LL
> | K6LL@juno.com
> |
> |
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  If you look real close you will see steel guys from
the boom ends on the 40mtr beam down to the mast 
just above the 20mtr beam. This is my margin of safety
and with the top guying on the 40 gives a nice diamond
effect of guying.  Ken

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