REFLECTOR: Flutter testing

[Kevin Baker]

Hi Glenn
Are you sure it was flutter and not full deflection alieon catch.

Thanks
Kevin 

.

On Feb 17, 2012, at 11:45, Glenn Babcock <glennbabcock at roadrunner.com> wrote:

> I had a low speed flutter in my right aileron.  Sounds like a similar scenario, initiating a turn at low speed.  It only happened at low speed and with nearly full deflection.  I had just completed high speed flutter testing and had no problems there.  My control surfaces were well balanced.
> 
> Make sure that everything in the rigging is nice and stiff.  I think i fixed mine when I redid the aileron bell crank bracket inside the cowling.
> 
> Regards,
> Glenn
> 
> 
> On Feb 17, 2012, at 11:38 AM, Scott Derrick wrote:
> 
>> I accidentally induced flutter in my winglets when trimming the plane for ball in the center, straight and level hands off flight..
>> 
>> Didn't notice it at the time because it wouldn't happen until abave 180 kias.  I found out over Vegas when approach gave me an immediate descent clearance for traffic. 
>> 
>> After fixing I went through the whole flutter regime as you are doing up to 210 kias. A nervous test for sure.  I found out what was fluttering, felt like a dog shaking off water!, by having a friend ride with me while I dove to 180 kias. He could look around and see what it was(right winglet) shaking.  Its tough to do alone. 
>> 
>> If your in phase one I think you could(I would) legally include a passenger for required co-pilot to help you figure out whats causing the vibration at 90kias.  Take somebody you implicitly trust.
>> 
>> Scott
>> 
>> 
>> -------- Original Message --------
>> Subject: REFLECTOR: Flutter testing
>> From: Ron N Velocity XLFG <VelocityXL at fastmail.fm>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Date: 02/17/2012 09:12 AM
>>>  I am continuing my flight testing and have been doing some flutter testing. What I have been doing is
>>> whacking the control stick to the front then  back then left then  right to see if I can induce flutter. So far no flutter up to 165 knots.
>>> I hate this part of the testing the plane is so responsive so when I wack the stick the plane does an very abrupt move.
>>> Bang my head once .  Ant one found a better way to induce flutter ?
>>>  
>>> Second thing I have noticed at climb out at around 90 knots and start a bank turn I get a small vibration I think it is buffeting of the canard
>>> any one else have this happen?
>>>  
>>> Ron
>>> 
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> 
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