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

[steve korney]

I personally installed the sparrow strainer upside down so that I could reduce the pitch spring tension.... I like being able to feel the the airplane flying with a light stick force...


Steve 

> Date: Fri, 14 Sep 2012 11:37:10 -0600
> From: scott at tnstaafl.net
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Sparrow strainer - I'm confused...
> 
> 
> >
> >   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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