[TowerTalk] Where does the element go?

[J. Gordon Beattie, Jr., W2TTT]

Ted,
I agree!  Drainage of the elements, maximizing ice melt and ease of
maintenance would be my driving factors here in New Jersey.
Happy Thanksgiving & 73,
Gordon Beattie, W2TTT
201.314.6964


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Ted Bryant
Sent: Thursday, 23 November, 2006 21:17
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Where does the element go?

If I remember my Statics & Dynamics correctly, the gravitational forces on a
horizontal element(and
the resulting torque on the boom) are the same whether it's mounted above or
below the boom.  For a
symetrical element mounted at its center, rotational torque due to gravity
should very close to
zero.

I suspect the decision whether to mount the element above or below the boom
is affected more by
other factors.

73, Ted W4NZ


On 22 Nov 2006 at 19:42, Bill Turner wrote:

> Nearly all of the all-metal yagis I've seen have the elements mounted
> on top of the boom. I wonder why?
>
> If they were mounted under the boom, gravity would be working to keep
> the boom in place instead of constantly trying to turn the boom over.
> This is such a common design I'm wondering what am I missing?



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