Abstract: A high efficiency forward swept airplane propeller includes a constant leading edge forward swept angle from the root to the tip. The forward sweep is created by leaning the blade leading edge tangentially toward the rotating direction on the rotating plane. The leading edge projection on the axial-radial plane is a straight line with constant axial position from the blade root to the tip. Alternate embodiments of the projection of the leading edge on the tangential rotating plane include: a propeller blade with a leading edge shape that has a smaller forward sweep angle (including 0 degree) in the inner portion of the blade and a larger forward sweep angle in the outer portion; a propeller blade that has a negative leading edge aft ward sweep angle in the inner portion of the blade and a positive forward sweep angle in the outer portion.