Aerodynamic question

[Nat Penton]

Park needs to increase the wing incidence. May take 2 to 4 
  -degrees. Will cure all his problems.---- Original Message ----- 
  From: RC Steve Sterling 
  To: discussion at nsrca.org 
  Sent: Friday, August 08, 2003 10:19 AM
  Subject: RE: Aerodynamic question


  Hi Ihncheol-- hope to see you at the Othello this weekend. I need someone to fly against.
    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Ihncheol Park
    Sent: Friday, August 08, 2003 2:14 AM
    To: NSRCA
    Subject: Aerodynamic question


    Hi, All,

    I have a couple of questions to ask.
    What happens if I increase the area of rudder that is under the horizontal stab or above (changing the shape of rudder)?

    Right now, I have 0 degrees down thrust, 0.3 degrees wing incidence angle, 0 degrees horizontal stab incidence.  The wing is one piece, so it is really hard to adjust the incidence. (there is only around 2 mm gap between the wing bolts mount and wing.  Horizontal stab is removable, but not adjustable. (Two carbon tubes of 8 mm OD tubes hold the horizontal stab.)

    Plane pitches to belly hard when rudder is applied during level flight and Knife edge flight. 
    Anyone know why this happens?

    Using up elevator mixing messes up the round manuevers if rudder correction is necessary.

    The plane carries 4 click of up elevator trim. 

    Slightly nose up attitude during level flight after removing 0.5 degrees down thrust. I may have to remove washers.

    I am trying to fix the current problems to remove the mixing as much as possible, so that I can build another one.

    Thank you,



    Ihncheol Park
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