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VPP driven parametric design of AC75 hydrofoils

VPP driven parametric design of AC75 hydrofoils
VPP driven parametric design of AC75 hydrofoils
Hydrofoils are a vital part of modern racing yachts such as the AC75, which was sailed in the 36th America´s Cup and should hence be optimised thoroughly. The literature shows that hydrofoil design and optimisation usually focuses on the lift and drag characteristics in isolation of the yacht `system´. Although these characteristics relate to hydrofoil performance, they do not directly translate to the performance of the yacht on the race course. In this paper we perform a parametric study of the main design variables of the hydrofoil that is based on a model of the entire yacht in the Velocity Prediction Program (VPP) FS-Equilibrium. The hydrofoil forces are modelled using an advanced lifting line method and empirical formulations for a bulb. This accurately captures the foil design influence on the boat´s performance. The VPP is coupled to a parametric model of the foil based on NURBS surfaces (Non-uniform rational B-Splines) which was used to systematically generate 72 different designs. The candidates were tested in three wind speeds for up and downwind performance. The best performing design has maximum span and anhedral angle, and minimum chord with some of the weight stored in a bulb. The study shows that the assessment of hydrofoils where the performance is measured in boat speed is an extremely valuable tool.
2475-370X
161-182
Tannenberg, Rafael Andreas Maximilian
bd497a87-ea59-4798-a28e-804d3fcb713b
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Hochkirch, Karsten
11d869b5-8f02-46a8-8851-abe2105048fd
Boyd, Stephen
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10
Tannenberg, Rafael Andreas Maximilian
bd497a87-ea59-4798-a28e-804d3fcb713b
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Hochkirch, Karsten
11d869b5-8f02-46a8-8851-abe2105048fd
Boyd, Stephen
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10

Tannenberg, Rafael Andreas Maximilian, Turnock, Stephen, Hochkirch, Karsten and Boyd, Stephen (2023) VPP driven parametric design of AC75 hydrofoils. Journal of Sailing Technology, 8 (1), 161-182, [SNAME-JST-2023-09]. (doi:10.5957/jst/2023.8.9.161).

Record type: Article

Abstract

Hydrofoils are a vital part of modern racing yachts such as the AC75, which was sailed in the 36th America´s Cup and should hence be optimised thoroughly. The literature shows that hydrofoil design and optimisation usually focuses on the lift and drag characteristics in isolation of the yacht `system´. Although these characteristics relate to hydrofoil performance, they do not directly translate to the performance of the yacht on the race course. In this paper we perform a parametric study of the main design variables of the hydrofoil that is based on a model of the entire yacht in the Velocity Prediction Program (VPP) FS-Equilibrium. The hydrofoil forces are modelled using an advanced lifting line method and empirical formulations for a bulb. This accurately captures the foil design influence on the boat´s performance. The VPP is coupled to a parametric model of the foil based on NURBS surfaces (Non-uniform rational B-Splines) which was used to systematically generate 72 different designs. The candidates were tested in three wind speeds for up and downwind performance. The best performing design has maximum span and anhedral angle, and minimum chord with some of the weight stored in a bulb. The study shows that the assessment of hydrofoils where the performance is measured in boat speed is an extremely valuable tool.

Text
VPP_Driven_Parametric_Study_on_AC75_Hydrofoil_Design-Tannenberg_et_al - Accepted Manuscript
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Accepted/In Press date: 4 October 2023
e-pub ahead of print date: 30 October 2023

Identifiers

Local EPrints ID: 483211
URI: http://eprints.soton.ac.uk/id/eprint/483211
ISSN: 2475-370X
PURE UUID: ac10c860-5d2b-4b10-80aa-285a5cd14fad
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

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Date deposited: 26 Oct 2023 16:40
Last modified: 18 Mar 2024 05:01

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Contributors

Author: Rafael Andreas Maximilian Tannenberg
Author: Stephen Turnock ORCID iD
Author: Karsten Hochkirch
Author: Stephen Boyd

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