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

none markinchampions at gmail.com
Fri Sep 14 14:42:43 CDT 2012


Then why have it?

Sent from my iPad

On Sep 14, 2012, at 1:20 PM, steve korney <s_korney at hotmail.com> wrote:

> 
> 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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