stability slides from rom2 only available direct from rya training
DESCRIPTION
STABILITY Slides from ROM2 Only available direct from RYA training. Stability. Righting lever. Boats return to the upright because of an interaction between their weight and buoyancy. As a boat heels, B moves away from G creating a righting lever called GZ. - PowerPoint PPT PresentationTRANSCRIPT
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STABILITY
Slides from ROM2
Only available direct from RYA training
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Stability Righting lever
Boats return to the upright because of an interaction between their weight and buoyancy
centre of gravitycentre of buoyancy
As a boat heels, B moves away from G creating a righting lever called GZA heavy boat takes more energy to heel because......energy = boat weight (force) x GZ (distance) = RM (righting moment)
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AVS for a vessel without roller furling gear
AVS for a vessel with roller furling gear
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Lifeboat Curve
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Testing underway
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IMS 33 Racer
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IMS 41 Racer
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MALO 41
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IMS 33 – Righting Arm (GZ) Curve
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IMS 41 – Righting Arm (GZ) Curve
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MALO41 – Righting Arm (GZ) Curve
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IMS 33 – Righting Lever (kN) Curve
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IMS 41 – Righting Lever (kN) Curve
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MALO41 – Righting Lever (kN) Curve
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Contessa 32 – Righting Lever (GZ)
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Different Hull Designs
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Water Ballast
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Finding the Centre of Gravity
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GZ
GZ (Righting arm) vs. kN (Righting moment)
IMS 33AVS 127⁰
Area above curve = energy required to capsize yacht
IMS 41
GZ (Righting arm) vs. kN (Righting moment)
AVS 135⁰
Area above curve = energy required to capsize yacht
MALO 41AVS 132⁰
Area above curve = energy required to capsize yacht
GZ (Righting arm) vs. kN (Righting moment)
Different STIX…and different capacity to resist capsize
IMS 33 IMS 41 MALO 41ISO STIX 33.3 ISO STIX 47.8 ISO STIX 55.4
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