How to design an airplane model according to the given design requirements?

There is a fixed pattern in the design of fixed-wing aircraft model. Some aircraft models do not extend fixed modes, and they are combined in lift area and material. Empty weight and flying weight are also different. As for flight speed and turning radius, this is the requirement for control technology, power and material hardness. The following is the design reference of fixed wing given by the older generation. According to the reference materials, design your own existing design requirements to design the model airplane. (The installation position of the wing is on the fuselage, in the fuselage and under the fuselage, which is called upper wing, middle wing and lower wing professionally. Some models are upper and lower wings. Power installation positions include front pull type, waist push type and tail push type. For reference only, please use it as soon as you are satisfied. Many of my answers have been unanswered for more than three years. The questioner did not give us encouragement in time, and some despised it. If you are not satisfied with the answer, you can close the question. We are enthusiastic respondents for free. )

Fixed wing setting order:

1, determine the wing area. 2. Determine the airfoil. 3. Determine the aileron area. 4. Determine the wing installation angle. 5. Determine the dihedral angle of the wing. 6. Determine the position of the center of gravity. 7. Determine the length of the fuselage and nose. 8. Determine the vertical tail and rudder area. 9. Determine the area of the horizontal tail and elevator.

Design steps and key points of airfoil aircraft

Airfoil Advantages Airfoil Disadvantages Scope of Application

Plano-convex airfoil is not suitable for inverted flight training machine because of its large lift and moderate drag.

The biconvex airfoil generates lift at a certain angle of attack, but does not generate lift at zero angle of attack.

Special aircraft with concave-convex airfoil, large lift and large resistance glider

Aircraft type wing load

Wing loading of glider glider is below 35g/DM.

The wing loading of ordinary fixed-wing aircraft is 35-100g/cm2.

Camera wing loading 100g/DM or above.

Airfoil refers to the cross-sectional shape of the wing or tail of an aircraft.

Aileron area Aileron area should account for about 20% of the wing area, and its length should be between 30-80% of the wing.

Installation Angle The fender installation angle should be between plus 0 and 3 degrees.

The greater the dihedral angle, the better the lateral stability of the aircraft, and vice versa.

The center of gravity is 25%-30% of the average aerodynamic chord length behind the leading edge of the wing.

The ratio of fuselage length, wingspan and fuselage is generally 70%-80%.

The nose length means that the distance from the leading edge of the wing to the rear plane of the propeller is equal to or less than 15% of the span.

The vertical tail area accounts for 10% of the wing.

The rudder area is about 25% of the vertical tail area.

Flat tail area The flat tail area should be 20-25% of the wing area.

The elevator area is about 20-25% of the horizontal tail area.

Determine the installation position of the flat tail. The distance from the leading edge of the wing to the horizontal tail is that the length of the tail arm is roughly equal to three times the chord length of the wing.

Determine the engine. Generally speaking, the power-to-weight ratio of gliders is about 0.5. The power-to-weight ratio of ordinary aircraft is about 0.8- 1. The power-to-weight ratio of the stunt machine is greater than 1.