REFLECTOR: sparrow strainer (old post)

[Scott Derrick]

Thanks Ronnie,

Good explanation.  And it does work. I've flown with and without.  Flew 
A NM-CA-NM trip with out the strainer and autopilot.  It is certainly 
flyable without it but easier with.

Scott

Ronnie Brown wrote:
> I believe Steve has this backwards - unless he meant that the sparrow
> strainer pushes the elevator DOWN which makes the plane go UP.
> 
> My thinking is that as airspeed decreases, as in pitched up, the airflow
> decreases and the sparrow strainer pressure is decreased allowing the
> elevator to go up, and the plane pitches down.
> 
> And the opposite effect when airspeed increases when the plane is
> descending, the airflow increases, causing more sparrow strainer pressure,
> which forces the elevator down, pitching the plane up.
> 
> All of this helps stabilize the Velocity at a constant pitch trim position.
> Seems to work!  My sparrow strainer chord angle is pointed down (about 15-20
> degrees) compared to the elevator.  I.e.. the nose of the strainer is
> pointed down when the elevator is level.
> 
> Ronnie Brown
> 
> ----- Original Message -----
> From: "Pat Shea" <xl340hp@yahoo.com>
> To: <reflector@tvbf.org>
> Sent: Wednesday, May 21, 2003 10:36 PM
> Subject: Re: REFLECTOR: sparrow strainer (old post)
> 
> 
> 
>>Sorry, another old post I flagged for reference that's
>>raising questions in my head:
>>
>><<Brian...
>>
>>The sparrow strainer inverted wing has 19 degrees of
>>incidence relative to the elevator...That is, if the
>>elevator is set to zero incidence  cord line,
>>then the cord line of the sparrow strainer is set so
>>the leading edge is up 19 degrees compared to the
>>trailing edge...That pushes the back of the
>>elevator up at higher speed...Relieves a lot of trim
>>spring pressure and gives the stick a much softer
>>feel...
>>
>>Hope that helps...Your mileage may very...
>>
>>Steve...
>>
>>Standard Wing-RG-MT 3 blade cs prop...>>
>>
>>Hmmm, I thought the sparrow strainer/inverted wing was
>>meant to act as a pitch dampener - not a trim tab. I
>>just mounted mine using the side templates supplied by
>>the factory (which set the sparrow's incidence) and it
>>has very little angle of attack relative to the
>>elevator. I can't see how this it is going to relieve
>>much spring pressure at any airspeed. Was the 19
>>degrees of relative incidence a mod??
>>
>>Pat
>>
>>
>>
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