highly significantp < 0.001
When the average (instead of the best) values are considered, the relationships between the power generated by thrust force (Pt) and the power needed to overcome drag force (Pd A : active and Pd P : passive) are still highly significant: Pd P = 38.69 + 0.618 Pt, R 2 = 0.942, N = 10, p < 0.001; Pd A = 58.04 + 0.926 Pt, R 2 = 0.942, N = 10, p < 0.001.