REFLECTOR: Sparrow strainer - I'm confused...

[steve korney]

I thought you might have something to add John....


Steve 

> Date: Fri, 14 Sep 2012 13:16:15 -0500
> From: aminetech at bluefrog.com
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Sparrow strainer - I'm confused...
> 
> Scott,
> 
> Great explanation.
> 
> John
> 
> On 9/14/2012 12:37 PM, Scott Derrick wrote:
> >
> >>
> >>   If the Sparrow Strainer were inverted to provide nose down force as 
> >> airspeed increases - this contributes to negative stability.  Which 
> >> is to say, as the aircraft speeds up, the nose will want to pitch 
> >> down ... which helps the aircraft speed up, which helps the nose 
> >> pitch down further ... which helps the aircraft speed up - you get 
> >> the idea.  Imagine this situation if disoriented in IMC.
> >
> > Anybody who's actually flown A Velocity with the sparrow strainer 
> > installed both upside down, not installed and downside down, knows 
> > that the above statement is completely and utterly false.  The plane 
> > will in no way act in the above manner.   What is described above is 
> > negative pitch stability, which the strainer is way way way to small 
> > to induce. In fact it's too small to induce neutral stability when 
> > installed upside down.
> >
> > Speaking from experience, upside or downside down installation changes 
> > the pitch stability in a slight way, in fact its hard to tell the 
> > difference in pitch stability, but it does make a slight positive  
> > change in pitch trim in cruise.
> >
> > Scott
> >
> >
> >
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