Today's Message Index:
----------------------
1. 06:41 AM - Re: Static Air from Cockpit for Altimeter, Air Speed Indicator and Rate of Climb and Descent Indicator (Charlie England)
2. 07:43 AM - Re: Static Air from Cockpit for Altimeter, Air Speed Indicator and Rate of Climb and Descent Indicator (George Nielsen)
Message 1
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| Subject: | Re: Static Air from Cockpit for Altimeter, Air Speed |
Indicator and Rate of Climb and Descent Indicator
On Fri, Nov 19, 2021 at 10:34 AM George Nielsen <genie@swissmail.org> wrote
:
>
>
> As my Avid Flyer does not have any specialised orifices for static air
> it uses cabin air for this purpose. (The air speed indicator is
> connected to the pitot tube.) My plan is to connect these instruments to
> a filter so that no dust or anything can enter their static air source.
> Does anyone have a good idea on how to make such a filter connection or
> where I can find one? Thanks.
>
> George Nielsen
> Avid Flyer I-66401
> The Hague, the Netherlands
>
Hi George,
The simplest way I can think of is to use a gasoline filter from a small
engine with a 1/8" NPT fitting on one end
<https://www.amazon.com/WIX-Filters-Complete-Line-Filter/dp/B000C9XZ0G/ref
=asc_df_B000C9XZ0G/?tag=hyprod-20&linkCode=df0&hvadid=265987795869&
hvpos=&hvnetw=g&hvrand=16638387693465208855&hvpone=&hvptwo=&hvqmt
=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026083&hvtargid=pla-560
403632829&psc=1>;
it will screw directly into the 1/8" NPT fittings found on panel
instruments in the USA. Downside is having that weight hanging off the end
of an instrument.
Another way is basically anything you'd see in this google search
<https://www.google.com/search?q=1%2F4%22+fuel+filter&oq=1%2F4%22+fuel+
filter&aqs=chrome..69i57j0i512l9.4488j0j7&sourceid=chrome&ie=UTF-8>
. That search was for 1/4" ID hose size, so you'd need an adapter to go
from the typical 1/8" NPT fitting on the instrument to a 1/4" hose barb,
and a short section of 1/4" ID rubber or plastic hose to connect to the
filter. Ideally you'd be connecting multiple instruments, so you'd use
'T' fittings with the filter on the last 'T' in the chain.
The hose & thread sizes are common sizes in US instruments, but if yours
are metric, I'd think that you'd have metric versions in Europe.
Charlie
Message 2
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| Subject: | Re: Static Air from Cockpit for Altimeter, Air Speed |
Indicator and Rate of Climb and Descent Indicator
Hi Charlie,
Thank you for the advice. I did not know that one could find such small
gasoline filters. That does make sense. I think that I will connect the
instruments with T-fittings. I will have to check but I believe that
they use fittings in inches so I will look for a 1/4" fitting or an
adapter to go from 1/8" to 1/4".
George
On 22-Nov-21 15:39, Charlie England wrote:
>
>
> On Fri, Nov 19, 2021 at 10:34 AM George Nielsen <genie@swissmail.org>
> wrote:
>
> <genie@swissmail.org>
>
> As my Avid Flyer does not have any specialised orifices for static
> air
> it uses cabin air for this purpose. (The air speed indicator is
> connected to the pitot tube.) My plan is to connect these
> instruments to
> a filter so that no dust or anything can enter their static air
> source.
> Does anyone have a good idea on how to make such a filter
> connection or
> where I can find one? Thanks.
>
> George Nielsen
> Avid Flyer I-66401
> The Hague, the Netherlands
>
>
> Hi George,
> The simplest way I can think of is to use a gasoline filter from a
> small engine with a 1/8" NPT fitting on one end
> <https://www.amazon.com/WIX-Filters-Complete-Line-Filter/dp/B000C9XZ0G/ref=asc_df_B000C9XZ0G/?tag=hyprod-20&linkCode=df0&hvadid=265987795869&hvpos=&hvnetw=g&hvrand=16638387693465208855&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026083&hvtargid=pla-560403632829&psc=1>;
> it will screw directly into the 1/8" NPT fittings found on panel
> instruments in the USA. Downside is having that weight hanging off the
> end of an instrument.
> Another way is basically anything you'd see in this google search
> <https://www.google.com/search?q=1%2F4%22+fuel+filter&oq=1%2F4%22+fuel+filter&aqs=chrome..69i57j0i512l9.4488j0j7&sourceid=chrome&ie=UTF-8>.
> That search was for 1/4" ID hose size, so you'd need an adapter to go
> from the typical 1/8" NPT fitting on the instrument to a 1/4" hose
> barb, and a short section of 1/4" ID rubber or plastic hose to connect
> to the filter.Ideally you'd be connecting multiple instruments, so
> you'd use 'T' fittings with the filter on the last 'T' in the chain.
>
> The hose & thread sizes are common sizes in US instruments, but if
> yours are metric, I'd think that you'd have metric versions in Europe.
>
> Charlie
>
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