REFLECTOR: Static port stuff

[aminetech at bluefrog.com]

Scott,

In my case, the external static port has been properly calibrated.  If I discover that the AP works better on cabin pressure, I will be strongly inclined to use cabin pressure.  I realize that with gear down, the cabin pressure may change a bit, and I'll have to determine if that significantly affects speed and altitude readings.  If you can think of another reason not to use cabin pressure, let me know.  Of course I don't yet know if it will make a difference with the AP.

John

--- scott at tnstaafl.net wrote:

From: Scott Derrick <scott at tnstaafl.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Static port stuff
Date: Sat, 28 Feb 2009 07:56:34 -0700

For some reason I am reluctant to accept using cabin pressure as a fix
to an improperly calibrated external static port?

Having cabin pressure as an alternate source seems prudent. 

Calibrating the static port is part and parcel to rigging the wings, or
rudders during the first 40 hours of flight. A necessary part of setting
up your aircraft for phase two flight?  Why settle for less?

Scott

Terry Miles wrote:
> Bill,
> First congrats.  The de-bug part of building can be quite a task.  Right
> when you thought you would be about done.  Have you considered just yanking
> the static port line from inside and just using the ambient cabin pressure?
> I have mine hooked up to outside and no problems to report, but I know guys
> with autopilot alt hold issues that consider this as a possible fix.  Are
> you up to date on this topic?
> Terry
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of LAURA WALKER
> Sent: Friday, February 27, 2009 5:41 PM
> To: reflector at tvbf.org
> Subject: REFLECTOR: Static port stuff
>
> Just wanted to thank everyone for their excellent input on my pitot/static
> situation. I tried the low altitude test at 200 kts over the airport, and
> sure enough, my altimeter read almost 400 feet high. I have since added
> three layers of metal tape behind the port, but have not had a chance to go
> up and test the change.
>
> The good news is that I now have 40.1 hrs on 36 Lost Vacations, so I am all
> set to get it down to my home field at EYE this weekend. I have been doing
> my Phase 1 testing at TYQ, and can't say enough good things about Dan
> Montgomery and all the excellent staff at Montgomery Aviation. If you are in
> the Indianapolis area, you will find a welcome like few others at this
> airport. They are now well-versed in Canardness, and can speak pitch-buck
> and flapless aviation with the best of them. 
>
> I'll post my static change results as soon as I find out myself.
>
> Bill 
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