That 130km/h figure is not the wind survival but the reference wind velocity
for the wind load of 500N.
130km/h is the standard reference for stress calculations in Germany used
for all locations except hilltop and coastal areas.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Charles Morrison
Sent: Donnerstag, 20. Mai 2021 02:07
To: Michael Tope
Cc: Tower and HF antenna construction topics.
Subject: Re: [TowerTalk] OptiBeam OB2-40M
130kph=80.7mph
for antenna, weather & racecars
On Wed, May 19, 2021 at 7:34 PM Michael Tope <W4EF@dellroy.com> wrote:
> One of the radio clubs I belong to is interested in buying an OptiBeam
> OB2-40M two-element 40 meter Moxon Yagi. Optibeam is kind of vague on
> wind survival specifications. Their website indicates "Windload at 130
> km/h 430 N / 0,54 m² / 5,9 feet²". To me that implies the
> antenna is designed to survive 130 km/h winds (80.7 MPH), but it doesn't
> actually say that. The antenna is going to be installed at a Southern
> California QTH at a fairly low elevation, so icing is extremely
> unlikely. However, the antenna will be installed on a high narrow ridge
> that lend itself to very high uneven (shearing) winds when we get the
> occasional winter storm or Santa Ana wind condition.
>
> Anyone out there using one of these antennas? I am curious what you
> think of it in terms of performance and reliability?
>
> Thanks and 73,
>
> Mike W4EF.................
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