Effects of the Hull Vane® positioning in the longitudinal direction on ship resistance are studied with the aid of computational fluid dynamics (CFD) simulations, verified using data from towing tests. A 31 m hard-chine crew boat was considered with three variations of vane's positioning: vane's leading edge in line with the transom, vane's leading edge one chord length behind the transom and vane's leading edge two chord lengths behind the transom. The vane's submerged depth is three quarter of the ship's draft. The vane's planform is rectangular with NACA 64_1-212 section and aspect ratio of 8.50. At relatively low speed (Fr ＜ 0.5) the Hull Vane® results in an increase of total resistance while at relatively high speed (Fr ＞ 0.5) it results in a decrease of total resistance. The decrease can reach a maximum value of 13.21% for the case of vane's positioning with the leading edge two chord lengths behind the transom. The Hull Vane® was found to work most effectively at the Froude number range between 0.5 and 0.7. At Froude numbers larger than 0.7 the vane's lift becomes too large to result in an excessive bow-down trim, which ultimately results in an increase of total resistance.
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