It's normally open, and activated when sufficient vacuum is applied.
Regards
Roddy kesterton g-ikrk
Sent from my iPhone
> On 20 Jun 2017, at 21:59, Kelvin Weston <kelv@kdweston.biz> wrote:
>
>
> Hi Bud and all
>
> Now I am really confused. I have fitted the Europa stall warning mod and
> switch
but not yet used in anger.
>
> How is this switch designed to work?
>
> Is it normally closed and held open by pressure above a certain speed.
> Or is it normally open and is closed by low pressure (vacuum), like a
> conventional
Cessna stall warner, caused by the angle of the wing.
>
> The mod leaflet suggests it is operated by vacuum, but your description of it
being on until above a certain speed suggests the first option.
> The switch has a hose connection to both sides of what I assume is a
> diaphragm,
so it is easy to connect incorrectly.
>
> If it is normally closed then does that result in the buzzer operating
> continually
on the ground until above the stall speed?
> I think that would eventually get to be a bit of a pain, especially during
> long
holds on the ground.
>
> --------
> Regards
>
> Kelv Weston
> Kit 497
> kelv@kdweston.biz
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470288#470288
>
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