REFLECTOR:Static Port

[Scott Derrick]

Got it, thanks Keith & Wayne.

Scott

Wayne Owens wrote:
> Wasn't too clear was it.
>  
> My TAS was reading higher than my average GPS ground speed over a course.
> I experimented by  adding a layer or two of duct tape to my bump to 
> confirm what happens.  The static pressure was lowered so the delta P 
> over the airspeed  indicator (scale) was greater. The air speed read 
> higher still.  It confirmed I needed to sand off some more of my 
> fiberglass bump.
>  
> ----- Original Message -----
> From: "Scott Derrick" <scott@tnstaafl.net <mailto:scott@tnstaafl.net>>
> To: <reflector@tvbf.org <mailto:reflector@tvbf.org>>
> Sent: Friday, July 04, 2003 4:12 PM
> Subject: Re: REFLECTOR:Static Port
> 
>  > Ok, let me get this straight...
>  >
>  > Raising the bump will raise the static pressure thus lowering your
>  > indicated airspeed?
>  >
>  > Lowering the bump will lower the static pressure thus raising your
>  > indicated airspeed?
>  >
>  > Scott
>  >
>  >
>  > Wayne Owens wrote:
>  > > Applying a layer of duct tape over the bump should make it read higher.
>  > > Sanding it off about 0.015 inch at a time should lower your indicated
>  > > airspeed.
>  > > Wayne
>  > > ----- Original Message -----
>  > > From: "Scott Derrick" <scott@tnstaafl.net <mailto:scott@tnstaafl.net>>
>  > > To: <reflector@tvbf.org <mailto:reflector@tvbf.org>>
>  > > Sent: Thursday, July 03, 2003 10:25 PM
>  > > Subject: REFLECTOR:Static Port
>  > >
>  > >
>  > >
>  > >>In this months Sport Aviation there is an article on how to calibrate
>  > >>your airspeed indicator.  The article mentions that the most often
>  > >>problem with incorrect airspeed indicators is the static port not
>  > >>providing a true static pressure.
>  > >>
>  > >>I'm sure mine is off at cruise speeds. I think it reads a lower 
> pressure
>  > >>than it should thus causing the airspeed indicator to register a higher
>  > >>indicated speed than it should.
>  > >>
>  > >>I have the standard 3 tiny holes in a vertical pattern  with a small
>  > >>aluminum block in front of the holes.   This is located about 10 inches
>  > >>below the pilot side elevator on the fuselage.
>  > >>
>  > >>Any body else determine theirs was not optimal?  Any easy fixes?
>  > >>
>  > >>Scott