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designed to obtain high lift coefficient and high spf..'Cd. The NACA thickness fonn is
combied with the mcanline a=0.8 in this OpenPVL code to construct propeller foil
sections. The meanline ofa=0.8 indicates that the pressure distribution on 80% ofthe foil
chord is unifonn (19]. The thickness form ofelliptical is designed to reduce drag and
obtain a thin blade with necessary strength. The thickness fonn ofparabolic combined
with the parabolic mean line is used to reduce resistance force and is applied for high­
speed applications. owadays, the commonly used foil sections are the ACA foil
sections, which includes some series ofmodels, such as 4-digit series, 5-digit series, 16­
series, 6-series, 7-series [19]. Each series has its own advantages and disadvantages.
Table 2 displays the advantages and disadvantages ofeach NACA series model.
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