REFLECTOR: Not enough Trim authority

Tue Nov 17 09:19:42 CST 2009

It was close to that with just me in it.  I haven't verified all my
speeds, since the new engine and refinishing(took it down
fiberglass/micro) the plane.  Been waiting  to get the engine cooling
issues done and  the new prop.

Next flight i will verify canard stall speed.  I'm flying in the test cg
box, but it should be close to what it would be at aft cg.

Scott

aminetech at bluefrog.com wrote:
> Actually it's approach speed that's the problem, too much canard incidence increases stall speed and requires you to fly a faster approach.  What is your stall speed?  If it's 60 kn solo, then the incidence is good.
>
> John
>
> --- scott at tnstaafl.net wrote:
>
> From: Scott Derrick <scott at tnstaafl.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Not enough Trim authority
> Date: Tue, 17 Nov 2009 06:43:29 -0700
>
> Wouldn't it balance out though.   The problem is speed range, combined
> with cg range.  Most up trim needed with two in front on approach, most
> down trim needed with one up front at cruise or descent from cruise.
>
> Scott
>
> aminetech at bluefrog.com wrote:
>   
>> Scott,
>>
>> The other thing to consider is canard incidence.  When I fly solo, which puts me very close to the aft cg limit, the canard stalls at 60 kn.  A higher stall speed would indicate the incidence is high and that would add to the trim problem at cruise.
>>
>> John
>>
>> --- scott at tnstaafl.net wrote:
>>
>> From: Scott Derrick <scott at tnstaafl.net>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Subject: Re: REFLECTOR: Not enough Trim authority
>> Date: Mon, 16 Nov 2009 16:29:58 -0700
>>
>> John,
>>
>> Musta been somebody else.  I've flown sans strainer and standard
>> install. Its on now with the flat side up, which I believe is the
>> standard way?    That would apply more up force which is exactly my
>> problem! 
>>
>> I'll take it off and try it.  Then install upside down and see how all
>> three methods come out.
>>
>> thanks,
>>
>> Scott
>>
>>
>> aminetech at bluefrog.com wrote:
>>   
>>     
>>> Scott,
>>>
>>> Before I reversed the sparrow strainer, my pitch trim ran out at 155-160 kias.  I recall that you tried reversing it and didn't have enough trim up for approach.  Perhaps no strainer at all would be a happy medium that would work for you.
>>>
>>> John
>>>
>>> --- scott at tnstaafl.net wrote:
>>>
>>>
>>>
>>> I do have a problem with the trim.  I just don't have enough down trim
>>> for cruise speeds.  If my indicated is 150kias or below its fine. I am
>>> using the Strong System because I was under the impression it had a
>>> wider range of trim than the factory design. Now I wonder.  I have
>>> plenty of up trim on approach with single pilot but I haven't loaded up
>>> the front yet(forward cg).  Still waiting for the new Catto prop before
>>> I add any more ballast to the front seat.  I have the system installed
>>> so its got about 60% down trim travel, and 40% up trim, so I'm already 
>>> over  compensated  for down trim.  The instructions call for 50/50.  
>>> I'm sending Alex an email to see what he recommends.
>>>
>>> In the mean time I'm thinking about plan B, which is to reinstall the
>>> factory trim, but stiffen up the spring somewhat to provide more trim
>>> authority.  I'msomewhat reluctant because of the problem of runway trim
>>> with a stronger spring.
>>>
>>> What are the fast V's doing?  I had marginal trim before with the
>>> factory spring, not quite enough down, just barely enough up with the
>>> io360.  Thats why I changed to the Strong system. 
>>>
>>> Anybody else have this problem?  Solutions?
>>>
>>> Scott
>>>
>>>
>>>
>>>  
>>>
>>>
>>>
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>>>   
>>>     
>>>       
>>
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>>   
>>     
>
>
>
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>   

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