Aerodynamic question

[Ihncheol Park]

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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