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RE: REFLECTOR: Pitot / static accuracy

Dear Andy:
   The original reason for the small "bump" on the area just in front of
the static ports was to trip the air flow and thus prevent a false
indication on the low side.  The static ports are on the fuselage taper
and will slightly pressurize under certain conditions, the trip strip
will prevent this.  The thickness of this strip can be changed to give
the correct reading.  It will also prevent icing on the static port,
however, if you have icing this far back on the fuselage, you are in
real trouble.  
   Sincerely,  Duane Swing 

> -----Original Message-----
> From:	Andrew L. Judge [SMTP:AJudge1@compuserve.com]
> Sent:	Monday, September 28, 1998 9:45 AM
> To:	reflector3
> Subject:	REFLECTOR: Pitot / static accuracy
> Has anyone placed a "bump" in front of their static source to prevent
> icing?  I have a bump in front of mine about a popsicle stick's
> thickness
> and 3/8 of an inch before the static source.  My altimeter is about
> 150'
> too high and my ASI is about 7 knots fast.  Has anyone experienced
> this? 
> I've seen the factory put a piece of adhesive tape in front of the
> static
> source on the elite and I've seen another elite do the same with a
> fixed
> bump.  I assumed it was for icing.
> Andy Judge
> N55AJ  FGE