the wound! (i mean wind)

[David McKenzie]

I'm likely going to cut the cap on the top of the tower so it can take
a larger mast. 10 feet of 1 3/8 top rail was not sufficient for a 30lb
5-bander with stacked loops 10 feet above that. I can use larger (and
much stronger) 1.66 OD conduit once I modify the tower. I may also
move the loops to the new mount on the roof.

On 11/24/10, Bob <n1ujs at toast.net> wrote:
> In the tradition of "Siskel & Ebert" (or Saturday Night Live's
> point/counterpoint skit with "Jane you ignorant slut!").............
>
> Oh hush George you namby pamby pantywaist!
>
> "My stuff is not as effective..."  Hah!!  That should read "....while no one
> can hear my puny signal....".....
> Noone has heard you in at least 10 years!!
>
> This is no time to succumb! This is the time to stand up and say I will not
> be beaten!  Take that bitch!
>
> This is the time for larger diameters!  Sleeve it inside and out at the
> stress points!  Then ADD 10 feet!!!
>
> Hee hee..... George....you know I respect your great scientific mind and
> your keen understanding of physics and such......I'm sure you can appreciate
> this in the spirit intended.....
>
>
> ----- Original Message -----
>   From: George Andrews
>   To: 144.450 Mailing List
>   Sent: Wednesday, November 24, 2010 6:44 PM
>   Subject: Re: [450] the wound! (i mean wind)
>
>
>   Dave,
>
>   Give thought to what happened. I know 42 inches probably probably means a
> lot to you and I can understand that. You have determined the weak point in
> the system. If your mast was steel, continued flexing softens the metal at
> the flex point. Aluminum becomes brittle with flexing (work hardens). If you
> leave it where it is, you may not have to worry about wind. Model the
> antennae to see what the decreased gain is. Maybe you don't want to go back
> to the full 42 inch difference. There is a gain to be achieved in never
> having to worry about wind and ice load and wind. My antennae are not as
> high as they could be, but ice and windload or wind have never been a worry.
> My three element 6 M beam is set up with a very crude slipping clutch so
> that all the mast and rotor rotate if the wind really gets a hold of it.
> This way a component of the energy that might bend the mast or damage the
> antenna gets translated to a rotational component. I have to rezero rotor
> every so often, but that is trivial. Over the years, I have heard some
> strange creaking and groaning, but have not lost an antenna or had damage
> since I have been licensed. On the flip side, my stuff is not as effective
> as if I pushed the envelope. But physics and gravity will always win!
>
>   George
>   N1YAE
>     ----- Original Message -----
>     From: David McKenzie
>     To: 144.450 Mailing List
>     Sent: Wednesday, November 24, 2010 12:23 PM
>     Subject: [450] the wound! (i mean wind)
>
>
>     The mast on the HF tower bent just above the thrust bearing in last
> night's wind. I dropped it down and cut the mast just above the bend. The HF
> beam and loops are now 42 inches lower until I can replace it.
>
>     The bend was very slight but was more than enough to bring the top about
> 30 degrees off vertical.
>
>     No other damage here.
>
>
>
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