REFLECTOR: TAS calibration?

[Dave Philipsen]

Mine's under the canard and works fine. You do realize that the higher you are (density altitude) the slower your IAS will appear, right?

Dave Philipsen


----- Reply message -----
From: "Geoff Gerhardt" <geoff.gerhardt at gmail.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: REFLECTOR: TAS calibration?
Date: Mon, Sep 30, 2013 2:56 pm
Guys,
My pitot/static is positioned under the canard - I suspect it is seeing increased pressure at high speeds thus giving me a low indicated airspeed.  This weekend, I thought I was smart and put a small static port right ahead of the dog house thinking that was a great place.  After a quick flight where my air speeds were through the roof, I realized that that spot was actually doing the opposite and was creating a low pressure region as the air bends over the nose.  I see now that I need to find a place on the flat section of the fuselage to put the static port.

Where does everyone else have their static port?
Thanks.
Geoff

On Sun, Sep 29, 2013 at 11:43 AM, Kurt Winker <nmflyer1 at aol.com> wrote:

Sounds like a trip-strip may be in order.



Kurt



Sent from my iPhone



> On Sep 29, 2013, at 6:47, Scott Baker <scottb33333 at gmail.com> wrote:

>

> I would assume that you are factoring altitude and temperature when calculating TAS. If so, airspeed error might be related to a pressurization of the static system (a common problem in Velocity aircraft that have their static port located forward of the entry door).


>

> Scott Baker

>

>> On Sep 28, 2013, at 8:29 PM, Geoff Gerhardt <geoff.gerhardt at gmail.com> wrote:

>>

>> Guys,

>>

>> Flying today I realized that my ground speed seems to be always greater than my TAS.  I figured at least some of the time it should be less (i.e. into a headwind).  But it always seemed to be greater.  So, today, I flew in a box, E, W, N, S and recorded my TAS and GS.  My TAS was constant at 159ktas on each leg, and my GS (GPS) was 185, 179, 171, 175 for the W, N, E, S legs.  If I add all those up and divide by four, I get 177.5kts, yet my TAS registered 158ktas.  Am I missing something?  Is my airspeed indicator reading too low?


>>

>> Thanks.

>>

>> Geoff

>>

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