REFLECTOR: N36LV not so fast...

[Al Gietzen]

Bill;

What is the configuration of the static port?  I have the standard type used
on Cessnas, et.al.; slightly raised surface around the port (see photo,
behind bottom back corner of door).  Does your door fit nice and flush; and
small gap?  If not, it may cause some turbulence at high speed.

Seems very unlikely to be leak in the static system; more likely something
to do with the surface in the area of the port.

Al



-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of LAURA WALKER
Sent: Sunday, February 22, 2009 6:44 PM
To: reflector at tvbf.org
Subject: REFLECTOR: N36LV not so fast...



Al, 

My pitot tube is in the factory location. Before my first flight, I checked
for leaks with a manometer and all was well. My airspeeds and groundspeeds
are pretty close to around 140 - 150 kts, but higher than that they become
grossly inaccurate. Haven't really thought about other issues, but
your similar location dictates maybe a little more scientific research. 

Here is one thing: I have a alternate static source toggle "valve" in my
panel. It does not really switch between outside and cabin sources, but
merely opens the complete static side pressure to both outside and inside
values. When I open this valve, my indicated speeds drop from 215 to about
202 kts indicated, while my groundspeed says more like 187 kts. I thought
that opening this should increase my indicated speeds, and since mine
decrease, I am still about 20 kts to the bad. Could a gross static side leak
have this kind of effect while leaving the speed range from 70 - 140 kts
mostly unaffected? 

In addition to the GRT system, I also have an analog airspeed indicator and
it matches the GRT to within 2 kts at 200 indicated.

John Abraham's superfast speeds suggest I have had this problem from the
very beginning.

Thanks,

Bill
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Sent: Sunday, February 22, 2009 1:00:17 PM
Subject: Reflector Digest, Vol 57, Issue 68

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Today's Topics:

  1. Re:  N36 LV not so fast....Darn it !!! (Al Gietzen)


----------------------------------------------------------------------

Message: 1
Date: Sat, 21 Feb 2009 21:26:29 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: N36 LV not so fast....Darn it !!!
To: "'Velocity Aircraft Owners and Builders list'"
    <reflector at tvbf.org>
Message-ID: <1A00D38F41B9466291AAED3E9B3D6CC5 at BigAl>
Content-Type: text/plain;    charset="us-ascii"

Yep, you guessed it. I put my static port behind the lower rear corner of
the passenger door and smack dab in a nice low pressurre spot. 

Bill; 
That's where I have my static port, and my indicated airspeeds are right on.
Where is your pitot tube?

Al




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