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Subject: Re: [LML] Re: the Legacy RG Static ports
From: Joseph Czabaranek <joeczabaranek@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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I havent bothered to check indicated airspeed or my altimeter in my 360.
 My static ports are flush.  They look like someone drilled a .010" hole
through the paint/clear coat.

Before you all added elevation to your static ports did you bother to check
the altimeter?  At 1000' MSL on a standard day, a .02" error in your static
line would give a 20' baro altitude error  AND a 1.5 KIAS error (at about
150 KIAS), IF your pitot line was measuring total pressure correctly.  An
indicated airspeed error could be more than just your static port ...

A low pass at tower level to +/- 20' might be more accurate than trying to
fly multiple legs of a course and measuring your KIAS to +/- 1.5 kts


On Tue, Jan 22, 2013 at 12:25 PM, Dennis Johnson <pinetownd@volcano.net>wrote:

> I have a Legacy RG and put my static ports flush with the outer skin,
> located in accordance with the assembly manual.  During my flight test
> phase, I pleasantly noticed that I always had a tailwind!  I knew I was
> lucky to be flying such a wonderful airplane and just figured I was equally
> lucky to always have a tailwind.
>
> Eventually, logic prevailed and I realized nobody could be that lucky.  I
> flew the four course GPS airspeed check and discovered that my indicated
> airspeed was reading low.  I added a tiny piece of machined aluminum,
> similar to a domed head rivet, to both static ports and it solved the
> problem.  Other Legacy builders who installed their static ports protruding
> slightly tell me that their indicated airspeed is accurate.
>
> Dennis
> Legacy 580 hours
>
> --
> For archives and unsub http://mail.lancaironline.net:**
> 81/lists/lml/List.html<http://mail.lancaironline.net:81/lists/lml/List.html>
>

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<div dir=3D"ltr">I havent bothered to check indicated airspeed or my altime=
ter in my 360. =A0My static ports are flush. =A0They look like someone dril=
led a .010&quot; hole through the paint/clear coat. =A0<div><br></div><div =
style>
Before you all added elevation to your static ports did you bother to check=
 the altimeter? =A0At 1000&#39; MSL on a standard day, a .02&quot; error in=
 your static line would give a 20&#39; baro altitude error =A0AND a 1.5 KIA=
S error (at about 150 KIAS), IF your pitot line was measuring total pressur=
e correctly. =A0An indicated airspeed error could be more than just your st=
atic port ...</div>
<div style><br></div><div style>A low pass at tower level to +/- 20&#39; mi=
ght be more accurate than trying to fly multiple legs of a course and measu=
ring your KIAS to +/- 1.5 kts</div></div><div class=3D"gmail_extra"><br><br=
>
<div class=3D"gmail_quote">On Tue, Jan 22, 2013 at 12:25 PM, Dennis Johnson=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:pinetownd@volcano.net" target=3D"_=
blank">pinetownd@volcano.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 a Legacy RG and put my static ports flush with the outer skin, locat=
ed in accordance with the assembly manual. =A0During my flight test phase, =
I pleasantly noticed that I always had a tailwind! =A0I knew I was lucky to=
 be flying such a wonderful airplane and just figured I was equally lucky t=
o always have a tailwind.<br>

<br>
Eventually, logic prevailed and I realized nobody could be that lucky. =A0I=
 flew the four course GPS airspeed check and discovered that my indicated a=
irspeed was reading low. =A0I added a tiny piece of machined aluminum, simi=
lar to a domed head rivet, to both static ports and it solved the problem. =
=A0Other Legacy builders who installed their static ports protruding slight=
ly tell me that their indicated airspeed is accurate.<br>

<br>
Dennis<br>
Legacy 580 hours <br><div class=3D"HOEnZb"><div class=3D"h5">
<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:<u></u>81/list=
s/lml/List.html</a><br>
</div></div></blockquote></div><br></div>

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