REFLECTOR: N36LV not so fast...

aminetech at bluefrog.com aminetech at bluefrog.com
Mon Feb 23 08:12:19 CST 2009


I had to "adjust" my static port to get an accurate altimiter reading at high speeds.  I use a piece of duct tape behind the port to do this.  Have you checked your altimiter at high speeds near ground level where you have a good idea what the altitude is?

John

--- blwalker105 at sbcglobal.net wrote:

From: LAURA WALKER <blwalker105 at sbcglobal.net>
To: reflector at tvbf.org
Subject: REFLECTOR: N36LV not so fast...
Date: Sun, 22 Feb 2009 18:43:57 -0800 (PST)



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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To: reflector at tvbf.org
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)


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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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