21-04-2020, 03:01 PM
Wing ...The heart of any wing is the main spar. Therefore, particular attention should be given to it, Shear webs ,with the grain running vertically to the spars is in order...The grain of the webs, running parallel to the spars can split with wing flex. On more than the odd occasion, I have seen where a kit manufacturer has made this simple error.....Shear webs, when cut accurately can be used as spacers when constructing a built up wing. Emanating from the wing centre ,they can go out towards the wing tips as far as required without adding much weight. Sheeting from the top spar to the leading edge and the same for the bottom spar, forms a '' D " box, adding strength.
Because fabric covered wings sag between ribs, your carefully selected wing profile is ever changing along it`s length. Full wing sheeting eliminates this problem and makes for stronger structure in heavier weather conditions. Some modellers don`t understand the reason for wing Dihedral and Poly- hedral. When the model rolls the upper panel reduces lift, because projected wing area is reduced compared to the lower panel which increases projected wing are..., Creating a righting moment.
Brian C
Because fabric covered wings sag between ribs, your carefully selected wing profile is ever changing along it`s length. Full wing sheeting eliminates this problem and makes for stronger structure in heavier weather conditions. Some modellers don`t understand the reason for wing Dihedral and Poly- hedral. When the model rolls the upper panel reduces lift, because projected wing area is reduced compared to the lower panel which increases projected wing are..., Creating a righting moment.
Brian C
