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

[none]

Got it. Mine isn't done yet, but I don't think it will be that fast. 

Sent from my iPad

On Sep 14, 2012, at 3:23 PM, John Dibble <aminetech at bluefrog.com> wrote:

> As I understand it, with no strainer and no trim spring, there is very little stick force required to move the elevator and that results in pitch instability.  The strainer was added to introduce a force for stability and that in turn required a trim spring.  Since some have flown without the strainer(but with the spring) with no problem, apparently the trim spring provides adequate pitch stability, so the strainer isn't needed for stability, but may be needed (in the upside down orientation) if you run out of trim at high speed.
> 
> John
> 
> On 9/14/2012 2:42 PM, none wrote:
>> 
>> 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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>> 
>> 
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> 
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