REFLECTOR: Flutter testing

[Glenn Babcock]

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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