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From: Bill Hannahan <wfhannahan@yahoo.com>
Subject:  Window Strength
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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  The hole that has always concerned me is the inspection hole at the smallest diameter of the IV fuselage, just ahead of the horizontal stab. Next time your near a IV hold the tip of the horizontal stab between your thumb and index finger and apply 3 pounds of force alternating in an up and down direction. Increase the frequency until you hit the resonant frequency. Continue applying the 3 pounds of force at that frequency and watch the amplitude increase. Try it with and without the cover attached.
   
  If I had a IV I would attach that cover with many screws and keep them tight.
   
  This does not work on the small tail 360, the resonant frequency is too high.
  

Regards,
  Bill Hannahan
  
wfhannahan@yahoo.com

       
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  <div class="MsoNormal"><o:p>&nbsp;</o:p></div>  <div class="MsoNormal">The hole that has always concerned me is the inspection hole at the smallest diameter of the IV fuselage, just ahead of the horizontal stab. Next time your near a IV hold the tip of the horizontal stab between your thumb and index finger and apply 3 pounds of force alternating in an up and down direction. Increase the frequency until you hit the resonant frequency. Continue applying the 3 pounds of force at that frequency and watch the amplitude increase. Try it with and without the cover attached.</div>  <div class="MsoNormal"><o:p>&nbsp;</o:p></div>  <div class="MsoNormal">If I had a IV I would attach that cover with many screws and keep them tight.</div>  <div class="MsoNormal"><o:p>&nbsp;</o:p></div>  <div class="MsoNormal">This does not work on the small tail 360, the resonant frequency is too high.</div>  <BR><BR><DIV>Regards,</DIV>  <DIV>Bill Hannahan</DIV>  <DIV><BR><A
 href="mailto:wfhannahan@yahoo.com">wfhannahan@yahoo.com</A></DIV><p>&#32;



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