University Of Tasmania
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The effect of heel angle and free-surface proximity on the performance and strut wake of a moth sailing dinghy rudder T-foil

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conference contribution
posted on 2023-05-26, 07:24 authored by Jonathan BinnsJonathan Binns, Paul BrandnerPaul Brandner, Plouhinec, J
The use of hydrofoils for sailing yachts is becoming more prolific. However its use in mainstream sailing classes has only become standard for the Moth dinghy class. The Moth class uses a twin T-Foil design, one on the centreboard for primary support and one on the rudder for additional support and control. The rudder T-Foil forms the basis of an experimental study carried out at the Australian Maritime College towing tank facility described here. Lift and drag data is presented for upright and heeled configurations considered indicative of windward sailing conditions. Force variation with respect to angle of incidence, depth of submergence and onset flow speed is presented using elliptical lift distribution parameters for easy design use. In addition deflection of the strut run-up was attempted to produce additional lift. Finally, a windward sailing condition prone to ventilation has been identified.


Publication status

  • Published

Event title

The 3rd High Performance Yacht Design Conference

Event Venue

Auckland, NZ

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

The definitive version published by the Royal Institute of Naval Architects, Copyright 2008 RINA

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  • Open

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