REFLECTOR: amount of trim

John Dibble aminetech at bluefrog.com
Mon Nov 10 09:29:55 CST 2008


Whole thing.

nmflyer1 at aol.com wrote:

> John,
>
> Are you just reversing the airfoil on the sparrow strainer or are you
> reversing the whole thing?
>
> Kurt
>
>
> -----Original Message-----
> From: John Dibble <aminetech at bluefrog.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Mon, 10 Nov 2008 7:42 am
> Subject: Re: REFLECTOR: amount of trim
>
> 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.JohnLou 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.JohnLou
>>      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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