2003 RYA Volvo Champion Club Seminars 2003 RYA Volvo Champion Club Seminar East Zone.
STABILITY Slides from ROM2 Only available direct from RYA training
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Transcript of STABILITY Slides from ROM2 Only available direct from RYA training
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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
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GZ (Righting arm) vs. kN (Righting moment)
IMS 33AVS 127⁰
Area above curve = energy required to capsize yacht
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IMS 41
GZ (Righting arm) vs. kN (Righting moment)
AVS 135⁰
Area above curve = energy required to capsize yacht
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MALO 41AVS 132⁰
Area above curve = energy required to capsize yacht
GZ (Righting arm) vs. kN (Righting moment)
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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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