REFLECTOR: amount of trim

[John Dibble]

When installed per the factory recommendation, the sparrow exerts a
downward force on the elevator, which must be countered by the trim
spring.  The faster you fly, the greater the force.  That's why you run
out of trim at high speeds (IAS).  When reversed, the sparrow exerts an
upward force, working with the trim spring, significantly expanding trim
capability.
Actually, at the risk of complicating this, I believe the sparrow, in
the reversed position provides more than the necessary force to overcome
the force of the airstream on the elevator and the trim spring is
actually now exerting a downward force on the elevator, but I don't know
how to prove that.

John

Lou Stedman wrote:

>  Thanks John. I always like to have friends drop by but. I am a bit
> confused, why would I reverse the sparrow? I am not knogleable on that
> subject. Lou Stedman
> Velocity N7044Q
> Olean, NY
>
>      ----- Original Message -----
>      From: John Dibble
>      To: Velocity Aircraft Owners and Builders list
>      Sent: Monday, November 10, 2008 7:28 AM
>      Subject: Re: REFLECTOR: amount of trim
>       Lou,
>
>      I had the same problem as you.  Right now I'm at the new
>      Dundee airport 17NK.  If you're interested I can stop by and
>      you can fly with me and see that reversing the sparrow
>      strainer has no effect on stability.
>
>      John
>
>      Lou Stedman wrote:
>
>     > Thanks Gary. Mine is a little different. When I am solo, I
>     > don't have enough down trim. I did a new W&B and found out
>     > I need thirty pounds of ballast in the nose when solo.
>     > That helps a lot with needed down trim but I can't help
>     > but think I need some down trim. What model are you
>     > flying? Lou Stedman
>     > Velocity N7044Q
>     > Olean, NY
>     >
>     >      ----- Original Message -----
>     >      From: Gary Stull
>     >      To: Velocity Aircraft Owners and Builders list
>     >      Sent: Sunday, November 09, 2008 10:17 PM
>     >      Subject: Re: REFLECTOR: amount of trim
>     >       I have much more up then down trim. In my case
>     >      I never need any down trim even flying solo,
>     >      always some up trim required.
>     >
>     >           ----- Original Message -----
>     >           From: Lou Stedman
>     >           To: Reflector Velocity
>     >           Sent: Friday, November 07, 2008 5:20
>     >           PM
>     >           Subject: REFLECTOR: amount of trim
>     >            I have looked through my manual but
>     >           do not find information on how much up
>     >           and down trim I am suppose to have. It
>     >           does say that the elevator should have
>     >           24-26 degrees of down and 20 degrees
>     >           of up. But it does not mention
>     >           anything about trim. Can someone shed
>     >           some light on this? I have lots of up
>     >           trim but almost no down trim. Lou
>     >           Stedman
>     >           Velocity N7044Q
>     >           Olean, NY
>     >
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