“…In summary, the results in Rozhdestvensky and Ryzhov (2003), Lentink and Gerritsma (2003) and An et al (2009) indicate that thick airfoils can improve plunging airfoil performance, whereas Vandenberghe et al (2006) and Wang (2000) suggest that thin airfoils perform better, and the inviscid analysis of Cebeci et al (2004) concludes no influence of airfoil thickness on plunging airfoil propulsion. Also according to the literature (Mueller and Batill, 1982;Kunz and Kroo, 2001) for static (nonflapping) airfoils at low Reynolds number flows, thin and sharp airfoils perform better than the thick and blunt airfoils.…”