Abstract

There were analyzed four different wing tip shapes. The coefficient of restoration, CR, is given by the ratio of the largest half wing to the smaller half wing in horizontal projection. Flight is stable for CR = 1.00. The influence of wing thickness profile is high. Increasing in the thickness from 5 mm to 15 mm (3 times), CR increases by 48% (5 mm) and 34% (15 mm). Increasing tilt angle, γ, CR increases from 1.00 to ∞ for γ = 0o, respectively, 80o (α = 10 °) (α - angle of the wing tip to the horizontal), then jump to -∞ and grow with negative values. CR increase from 1.00 to ∞ jumping to -∞ for γ = 60°, with α = 30°. Sideslip occurs when model aircraft has horizontally the longitudinal axes and wing is verticals. Airplane model is in an unstable area, for γ = 80o, respectively, 60o for α = 10o, respectively, 30o. The wing tip should be made of straight lines not rounded.

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