Investigation of the effects of hydrofoil set-up on the performance of an international moth
dinghy using a dynamic VPP
Investigation of the effects of hydrofoil set-up on the performance of an international moth
dinghy using a dynamic VPP
The International Moth dinghy is a 3.355m long single handed, una-rigged monohull dinghy. The class rules allow the use of hydrofoil that in certain wind conditions can significantly reduce resistance. A new velocity prediction program (VPP) has been developed to evaluate the impact of hydrofoil design and set-up on the performance of a Moth dinghy by simulating racing on a windward - leeward course. The VPP generates polar diagrams indicating the speed of the craft in a range of true wind strengths and angles. Sail force and windage are modelled using aerofoil theory. The drag model includes hull skin friction and residuary resistance, profile and induced drag for every foil, wavemaking drag of the lifting foils and spray drag of the surface piercing foils. Using an iterative process the VPP determines the boat speed that balances resistive forces with drive force, heeling moment and righting moment and vertical lift forces with weight. A series of case studies demonstrate the use of the VPP by examining the effects of changing the span of the forward foil, adding end plates, and using different foil geometries on performance.
sailing vpp, hydrofoil yacht
43-56
Findlay, M.W.
cd8f6c9f-10bc-48ea-929c-a6048fa81e42
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
May 2008
Findlay, M.W.
cd8f6c9f-10bc-48ea-929c-a6048fa81e42
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Findlay, M.W. and Turnock, S.R.
(2008)
Investigation of the effects of hydrofoil set-up on the performance of an international moth
dinghy using a dynamic VPP.
Innovation in High Performance Sailing Yachts, Lorient, France.
29 - 30 May 2008.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
The International Moth dinghy is a 3.355m long single handed, una-rigged monohull dinghy. The class rules allow the use of hydrofoil that in certain wind conditions can significantly reduce resistance. A new velocity prediction program (VPP) has been developed to evaluate the impact of hydrofoil design and set-up on the performance of a Moth dinghy by simulating racing on a windward - leeward course. The VPP generates polar diagrams indicating the speed of the craft in a range of true wind strengths and angles. Sail force and windage are modelled using aerofoil theory. The drag model includes hull skin friction and residuary resistance, profile and induced drag for every foil, wavemaking drag of the lifting foils and spray drag of the surface piercing foils. Using an iterative process the VPP determines the boat speed that balances resistive forces with drive force, heeling moment and righting moment and vertical lift forces with weight. A series of case studies demonstrate the use of the VPP by examining the effects of changing the span of the forward foil, adding end plates, and using different foil geometries on performance.
Text
Findlay_Turnock_Foil_VPP.pdf
- Other
More information
Published date: May 2008
Venue - Dates:
Innovation in High Performance Sailing Yachts, Lorient, France, 2008-05-29 - 2008-05-30
Keywords:
sailing vpp, hydrofoil yacht
Organisations:
Fluid Structure Interactions Group
Identifiers
Local EPrints ID: 52462
URI: http://eprints.soton.ac.uk/id/eprint/52462
PURE UUID: 6c44f77c-010e-4026-b832-5ced1aa2d2a6
Catalogue record
Date deposited: 01 Jul 2008
Last modified: 16 Mar 2024 02:37
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Contributors
Author:
M.W. Findlay
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