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Subject: Re: [LML] Removing vacuum pump?
From: Mike Larkin <legacyl2k@gmail.com>
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Plus you don't waste precious HP running the pump.  This came up when we
were looking at the advantages of running electronic ignition vs mags on
some of the Redbull airplanes.  Less loss for accessories, more power to
the prop...

Mike

4LL


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
>



-- 
Mike Larkin
LarkinAviationConsulting
LegacyL2K@gmail.com
602-770-6054

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<div dir=3D"ltr"><div><div>Plus you don&#39;t waste precious HP running the=
 pump.=A0 This came up when we were looking at the advantages of running el=
ectronic ignition vs mags on some of the Redbull airplanes.=A0 Less loss fo=
r accessories, more power to the prop...<br>
<br></div>Mike<br><br></div>4LL<br></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"_bl=
ank">cberland@systems3.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">I have an all-electric airplane as well and =
chose to not have any vacuum supplied to the Dukes valve. =A0The only diffe=
rence is the rate in which pressurization starts building in the cabin on t=
akeoff roll. =A0Once airborne, vacuum has no effect on the pressurization s=
ystem. =A0 I choose to apply power a little more slowly than some pilots. =
=A0This prevents any pressurization discomfort and typically I don&#39;t ne=
ed any right brake to hold centerline. =A0Takeoff distance is not an issue.=
 =A0If I can land there, I can easily takeoff there. =A0I know one pilot wh=
o has developed an electronic circuit to control a small electric vacuum pu=
mp based on the landing gear position. =A0So there are several options. =A0=
In my opinion, keeping the engine 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><br clear=3D"all"><br>-- <br><font style=3D"font-fam=
ily:georgia,serif;color:rgb(0,0,0)" size=3D"4">Mike Larkin</font><br style=
=3D"color:rgb(51,51,255)"><font style=3D"color:rgb(51,51,255)" size=3D"4">L=
</font><span style=3D"color:rgb(51,51,255)">arkin</span><font style=3D"colo=
r:rgb(51,51,255)" size=3D"4">A</font><span style=3D"color:rgb(51,51,255)">v=
iation</span><font style=3D"color:rgb(51,51,255)" size=3D"4">C</font><span =
style=3D"color:rgb(51,51,255)">onsulting</span><br style=3D"color:rgb(51,51=
,255)">
<span style=3D"color:rgb(51,51,255)"><a href=3D"mailto:LegacyL2K@gmail.com"=
 target=3D"_blank">LegacyL2K@gmail.com</a></span><br style=3D"color:rgb(51,=
51,255)"><span style=3D"color:rgb(51,51,255)">602-770-6054</span>
</div>

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