What is a dihedral / anhedral / polyhedral and should I have any in my wing?
Dihedral when the tips are higher than the centre of the wing, anhedral when the tips are lower, and polyhedral is when the wings are curved up. Dihedral makes the plane roll upright if it is upset, and too much dihedral makes it hard to do aerobatics and fly inverted. Anhedral also affects aerobatics and should be avoided at all costs. Polyhedral is common in thermal soarers that don’t have ailerons. CS models have ailerons so don’t need self righting wings. The Eraser wing should be built flat – tips at same height as centre. The Warbirds can do with a little dihedral for looks – having the tips about 25mm higher than the centre of the wing looks great and doesn’t adversely affect the aerodynamics.
