REFLECTOR: amount of trim

[Brian Michalk]

Didn't Hiroo Humeno make an autopilot tab out of the sparrow strainer?

I wonder how that worked out?

John Dibble wrote:
> 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 <mailto:aminetech at bluefrog.com>
>>     *To:* Velocity Aircraft Owners and Builders list
>>     <mailto:reflector at tvbf.org>
>>     *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 <mailto:gstull at tampabay.rr.com>
>>>         *To:* Velocity Aircraft Owners and Builders list
>>>         <mailto:reflector at tvbf.org>
>>>         *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 <mailto:stedmanlou at roadrunner.com>
>>>             *To:* Reflector Velocity <mailto:reflector at tvbf.org>
>>>             *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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