REFLECTOR: Flying front vibration

AnnSam annsam1 at earthlink.net
Tue Sep 28 15:42:41 CDT 2004


Has the plane been flutter tested? If not,check starting at speeds lower
than the vibration occurs.
  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
Behalf Of Rene Dugas
  Sent: Monday, September 27, 2004 7:37 PM
  To: reflector at tvbf.org
  Subject: REFLECTOR: Flying front vibration


  Dear folks,

  XLRG if flying faster than 170 kts a slight vibration is felt in my feet
near the canard bulkhead.  It gets worse up to 200 kts. but only slightly.
No vibration in the stick and none visible in canard or elevators.  Gear
doors are up and tight.  I tightened them and checked on jacks yesterday.
No slack in elevators or hinges detectable.  Canard bolts are tight and no
motion detectable with lifting plane's nose by canard.  Rear gear doors are
closed and flush and snug.  Doors are not vibrating.  No vibration in rudder
pedals or visible in winglets or wings.

  At above 160 knots indicated my trailing edge of the elevator is about
1/8th inch up for level flight.  Have others encountered this.  I feel it is
canard turbulence as the air goes over the canard and hits the upward
deflected elevator there is a resonance or harmonic that is disconcerting
but not particularly unpleasant.  Others do not notice.  The plane with prop
balanced is amazingly smooth in operation except at cruise over 170 kts. I
am considering a slight change in canard incidence.  My angle of attack
indicator states at cruise I am at 3 degrees up.  The vibration is sort of
like when both windows are down on a pickup  at 60 mph.  a slight pop or
"whop" can be felt.  I closed the vent to no avail.  This is a vibration not
a sound.

  Ideas?

  250 hrs

  Rene'
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20040928/9afdd419/attachment.html


More information about the Reflector mailing list