[TowerTalk] OptiBeam OB2-40M

[Michael Tope]

Yes, I understand the units conversion, Charlie. That's not the problem. 
Strictly speaking the specification says that the lateral force on the 
antenna in a 130 km/h wind is 430 newtons (96.6 lbs). Is 130 km/h also 
the maximum wind survival speed? It doesn't explicitly say that, but it 
is sort of implied.

73, Mike W4EF.....................

On 5/19/2021 5:07 PM, Charles Morrison wrote:
> 130kph=80.7mph
> for antenna, weather & racecars
>
>
> On Wed, May 19, 2021 at 7:34 PM Michael Tope <W4EF at dellroy.com 
> <mailto:W4EF at 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.................
>