REFLECTOR: Flutter testing

[steve korney]

Didn't mean to ruffle your feather Scott.... Just a reasonable observation...

Steve 

Date: Fri, 17 Feb 2012 16:07:08 -0700
From: scott at tnstaafl.net
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Flutter testing



  


    
    
  
  
    Yeah, it does sound risky, but I did a couple flights by myself and
    nailed down the initial speed to close to 183 kias.  

    

    The test flight was mapped out with speeds and altitudes preset for
    testing, with a top speed set of 183 kias.  With the local
    A&P/AI in the right seat, I snuck up to just below that speed
    and he could see the winglet start to move well before I could feel
    it.

    

    I didn't just get in it with somebody, and go into a dive until it
    started to shudder!  

    

    Still yes there was an elevated risk. If your risk averse don't fly
    experimental airplanes!

    

    Scott

    

    steve korney wrote:
    
      
      
        I hate to say it Scott... But, taking two people into a flutter
        test doesn't sound reasonable to me... For safety...

        

        

        Steve 

        

        
          Date: Fri, 17 Feb 2012 09:38:50 -0700

          From: scott at tnstaafl.net

          To: VelocityXL at fastmail.fm; reflector at tvbf.org

          Subject: Re: REFLECTOR: Flutter testing

          

          
          
          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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