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Date: Wed, 9 Oct 2013 17:13:46 -0700
Message-ID: <CAAXEWUoh9RXqxFL6r5x-ye7JzbJWqrOMusOOPh4-EN0uGp4bew@mail.gmail.com>
Subject: Re: [LML] Removing vacuum pump?
From: "William A. Hogarty" <billhogarty@gmail.com>
To: Lancair Mailing List <lml@lancaironline.net>
Content-Type: multipart/alternative; boundary=047d7bea41981bebe604e857e0d2

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I understood that the outflow valve was grounded whenever the gear switch
was down.

Is this wrong?

Bill Hogarty


On Wed, Oct 9, 2013 at 9:13 AM, Craig Berland <cberland@systems3.net> wrote:

> I have an all-electric airplane as well and chose to not have any vacuum
> supplied to the Dukes valve.  The only difference is the rate in which
> pressurization starts building in the cabin on takeoff roll.  Once
> airborne, vacuum has no effect on the pressurization system.   I choose to
> apply power a little more slowly than some pilots.  This prevents any
> pressurization discomfort and typically I don't need any right brake to
> hold centerline.  Takeoff distance is not an issue.  If I can land there, I
> can easily takeoff there.  I know one pilot who has developed an electronic
> circuit to control a small electric vacuum pump based on the landing gear
> position.  So there are several options.  In my opinion, keeping the engine
> driven pump is the least desirable.
>
> Craig Berland
> N7VG
>
>
> Hello Dico,
> You will need a vacuum port to the Dukes pressure valve for the
> pressurization to work correctly, I do not have any gyro instruments either
> but I needed to install an electric vacuum pump near the Dukes valve
> Kamal T
> N1104T
>
>
>
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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<div dir=3D"ltr"><div>I understood that the outflow valve was grounded when=
ever the gear switch was down.</div><div>=A0</div><div>Is this wrong?</div>=
<div>=A0</div><div>Bill Hogarty</div></div><div class=3D"gmail_extra"><br><=
br><div class=3D"gmail_quote">
On Wed, Oct 9, 2013 at 9:13 AM, Craig Berland <span dir=3D"ltr">&lt;<a href=
=3D"mailto:cberland@systems3.net" target=3D"_blank">cberland@systems3.net</=
a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I have an all-electric airplane as well and chose to not have any vacuum su=
pplied to the Dukes valve. =A0The only difference is the rate in which pres=
surization starts building in the cabin on takeoff roll. =A0Once airborne, =
vacuum has no effect on the pressurization system. =A0 I choose to apply po=
wer a little more slowly than some pilots. =A0This prevents any pressurizat=
ion discomfort and typically I don&#39;t need any right brake to hold cente=
rline. =A0Takeoff distance is not an issue. =A0If I can land there, I can e=
asily takeoff there. =A0I know one pilot who has developed an electronic ci=
rcuit to control a small electric vacuum pump based on the landing gear pos=
ition. =A0So there are several options. =A0In my opinion, keeping the engin=
e driven pump is the least desirable.<br>

<br>
Craig Berland<br>
N7VG<br>
<br>
<br>
Hello Dico,<br>
You will need a vacuum port to the Dukes pressure valve for the pressurizat=
ion to work correctly, I do not have any gyro instruments either but I need=
ed to install an electric vacuum pump near the Dukes valve<br>
Kamal T<br>
N1104T<br>
<br>
<br>
<br>
<br>
--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists/lml/L=
ist.html</a><br>
</blockquote></div><br></div>

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