Re: Fuselage length, CG and decalage?

From: <RLBailey_at_care4free.net>
Date: Wed, 1 Apr 2009 16:31:36 +0100

A longer fus means best CG position is further back and decalage should not depend much on length except that a bit more stability is needed than with a shorter fus (less effective pitch moment of inertia).

Stiffening tailplane and tailboom will enable the CG to go back and still retain adequate stability.

Bob
---- Original Message -----
  From: Tapio Linkosalo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Wednesday, April 01, 2009 7:30 AM
  Subject: [Indoor_Construction] Fuselage length, CG and decalage?


  I'm returning back to the question of the huge decalage (oveer 6
  degrees) that I have in my current F1D. Looks like part of the problem
  is the tailplane, that is too flexible, and washes in in the flight,
  thus reducing the decalage. Therefore the static 6 degrees may not be
  the whole truth. But another thing that came to my mind, when seeing the
  drawing of the model of Leif Englund, was the fuselage length. Leif uses
  a model with overall fuz length of 800mm (with 50mm of nose), while my
  model, built along Big Square drawings, has overall lenght of 910mm.
  Longer moment arm of the tail means that it needs to lift less, thus
  reduce it's angle of attack? Maybe shortening the fuselage would improve
  the model? Definately it would make the fuselage lighter and stiffer...

  -Tapio-

  


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Received on Wed Apr 01 2009 - 08:32:07 CEST