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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)
![Page 4: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/4.jpg)
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AVS for a vessel without roller furling gear
AVS for a vessel with roller furling gear
![Page 5: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/5.jpg)
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Lifeboat Curve
![Page 6: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/6.jpg)
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Testing underway
![Page 7: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/7.jpg)
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IMS 33 Racer
![Page 8: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/8.jpg)
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IMS 41 Racer
![Page 9: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/9.jpg)
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MALO 41
![Page 10: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/10.jpg)
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IMS 33 – Righting Arm (GZ) Curve
![Page 11: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/11.jpg)
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IMS 41 – Righting Arm (GZ) Curve
![Page 12: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/12.jpg)
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MALO41 – Righting Arm (GZ) Curve
![Page 13: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/13.jpg)
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IMS 33 – Righting Lever (kN) Curve
![Page 14: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/14.jpg)
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IMS 41 – Righting Lever (kN) Curve
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MALO41 – Righting Lever (kN) Curve
![Page 16: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/16.jpg)
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Contessa 32 – Righting Lever (GZ)
![Page 17: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/17.jpg)
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Different Hull Designs
![Page 18: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/18.jpg)
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Water Ballast
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Finding the Centre of Gravity
![Page 20: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/20.jpg)
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GZ
![Page 21: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/21.jpg)
GZ (Righting arm) vs. kN (Righting moment)
IMS 33AVS 127⁰
Area above curve = energy required to capsize yacht
![Page 22: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/22.jpg)
IMS 41
GZ (Righting arm) vs. kN (Righting moment)
AVS 135⁰
Area above curve = energy required to capsize yacht
![Page 23: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/23.jpg)
MALO 41AVS 132⁰
Area above curve = energy required to capsize yacht
GZ (Righting arm) vs. kN (Righting moment)
![Page 24: STABILITY Slides from ROM2 Only available direct from RYA training](https://reader033.vdocuments.us/reader033/viewer/2022061617/56815b2c550346895dc8f27d/html5/thumbnails/24.jpg)
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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???