Cybertom

Charsb,

I am making headway on the "incidence thing". It's fairly complicated but possible to calculate with a little work. You need to know the following to get the correct answer:

1. Tailplane efficiency
2. Area of wings and tailplane
3. Distance between wing and tails aerodynamic center
4. Slope of the respective airfoil's lift curve
5. Fuselage area distribution
6. Downwash variations

The coolest part is the lift curve because if you select the right airfoil for the tailplane it will balance out against the lift of the main wings at different speeds. Here is where you get the "I have to constantly change the trim for different speeds" complaint when the design is not properly balanced.

I am gathering all of my data and will attempt the calculation on a known full scale aircraft to see how close I come to the actual setting. Once I have this nailed I will post the results here.