An airfoil -LRB- in MISC@1 -RRB- or aerofoil -LRB- in MISC@2 -RRB- is the shape of a wing or blade -LRB- of a propeller , rotor or turbine -RRB- or sail as seen in cross-section .

An airfoil -LRB- in MISC@1 , or aerofoil in MISC@2 -RRB- is the shape of a wing or blade -LRB- of a propeller or ship 's screw or sail -RRB- as seen in cross-section .
