Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels

S. Day, P. Cameron, E. Nixon

Research output: Contribution to conferencePaper

Abstract

This study examines the relative merits of physical testing techniques which may be used in early stage design for assessment of the resistance of high-performance sailing vessels. The hull chosen as a benchmark form is a high-speed hard-chine sailing dinghy. The hull proportions and shape are typical of modern trends in skiff design, but may also be considered to be broadly similar to some high performance yacht hulls. The 4.55m hull was tested at full scale in a moderate size towing tank, at 1:2.5 scale in the same tank, and at full-scale by towing on open water.
Results show the mean discrepancy in the measured resistance between the open water towing and the full-scale tank test is around 4%. The challenges of full-scale open-water testing are discussed and several improvements identified for future work. Comparison of the full-scale results suggests that blockage and depth correction for the full-scale hull in the tank do not present a substantial problem for subcritical speeds. Larger discrepancies were found between resistance from the model scale and the full scale tank tests at higher speeds; it was speculated that these discrepancies relate to the differences in the detailed geometry of the model and full-scale boat, particularly in the region of the chines.

Conference

Conference International Conference on Innovation in High Performance Sailing Yachts
Abbreviated titleINNOV'SAIL 2017
CountryFrance
CityLorient
Period28/06/1730/06/17
Internet address

Fingerprint

Sailing vessels
Hydrodynamics
Testing
Ship model tanks
Yachts
Costs
Water
Boats
Geometry

Keywords

  • hydrodynamics
  • testing
  • resistance

Cite this

Day, S., Cameron, P., & Nixon, E. (2017). Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels. Paper presented at International Conference on Innovation in High Performance Sailing Yachts, Lorient, France.
Day, S. ; Cameron, P. ; Nixon, E. / Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels. Paper presented at International Conference on Innovation in High Performance Sailing Yachts, Lorient, France.10 p.
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abstract = "This study examines the relative merits of physical testing techniques which may be used in early stage design for assessment of the resistance of high-performance sailing vessels. The hull chosen as a benchmark form is a high-speed hard-chine sailing dinghy. The hull proportions and shape are typical of modern trends in skiff design, but may also be considered to be broadly similar to some high performance yacht hulls. The 4.55m hull was tested at full scale in a moderate size towing tank, at 1:2.5 scale in the same tank, and at full-scale by towing on open water.Results show the mean discrepancy in the measured resistance between the open water towing and the full-scale tank test is around 4{\%}. The challenges of full-scale open-water testing are discussed and several improvements identified for future work. Comparison of the full-scale results suggests that blockage and depth correction for the full-scale hull in the tank do not present a substantial problem for subcritical speeds. Larger discrepancies were found between resistance from the model scale and the full scale tank tests at higher speeds; it was speculated that these discrepancies relate to the differences in the detailed geometry of the model and full-scale boat, particularly in the region of the chines.",
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author = "S. Day and P. Cameron and E. Nixon",
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note = "International Conference on Innovation in High Performance Sailing Yachts, INNOV'SAIL 2017 ; Conference date: 28-06-2017 Through 30-06-2017",
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Day, S, Cameron, P & Nixon, E 2017, 'Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels' Paper presented at International Conference on Innovation in High Performance Sailing Yachts, Lorient, France, 28/06/17 - 30/06/17, .

Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels. / Day, S.; Cameron, P.; Nixon, E.

2017. Paper presented at International Conference on Innovation in High Performance Sailing Yachts, Lorient, France.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels

AU - Day, S.

AU - Cameron, P.

AU - Nixon, E.

PY - 2017/6/29

Y1 - 2017/6/29

N2 - This study examines the relative merits of physical testing techniques which may be used in early stage design for assessment of the resistance of high-performance sailing vessels. The hull chosen as a benchmark form is a high-speed hard-chine sailing dinghy. The hull proportions and shape are typical of modern trends in skiff design, but may also be considered to be broadly similar to some high performance yacht hulls. The 4.55m hull was tested at full scale in a moderate size towing tank, at 1:2.5 scale in the same tank, and at full-scale by towing on open water.Results show the mean discrepancy in the measured resistance between the open water towing and the full-scale tank test is around 4%. The challenges of full-scale open-water testing are discussed and several improvements identified for future work. Comparison of the full-scale results suggests that blockage and depth correction for the full-scale hull in the tank do not present a substantial problem for subcritical speeds. Larger discrepancies were found between resistance from the model scale and the full scale tank tests at higher speeds; it was speculated that these discrepancies relate to the differences in the detailed geometry of the model and full-scale boat, particularly in the region of the chines.

AB - This study examines the relative merits of physical testing techniques which may be used in early stage design for assessment of the resistance of high-performance sailing vessels. The hull chosen as a benchmark form is a high-speed hard-chine sailing dinghy. The hull proportions and shape are typical of modern trends in skiff design, but may also be considered to be broadly similar to some high performance yacht hulls. The 4.55m hull was tested at full scale in a moderate size towing tank, at 1:2.5 scale in the same tank, and at full-scale by towing on open water.Results show the mean discrepancy in the measured resistance between the open water towing and the full-scale tank test is around 4%. The challenges of full-scale open-water testing are discussed and several improvements identified for future work. Comparison of the full-scale results suggests that blockage and depth correction for the full-scale hull in the tank do not present a substantial problem for subcritical speeds. Larger discrepancies were found between resistance from the model scale and the full scale tank tests at higher speeds; it was speculated that these discrepancies relate to the differences in the detailed geometry of the model and full-scale boat, particularly in the region of the chines.

KW - hydrodynamics

KW - testing

KW - resistance

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M3 - Paper

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Day S, Cameron P, Nixon E. Moderate-cost approaches for hydrodynamic testing of high performance sailing vessels. 2017. Paper presented at International Conference on Innovation in High Performance Sailing Yachts, Lorient, France.