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Evaluating Propeller Cuts

Evaluating Propeller Cuts. Evaluating Propeller Cuts Using Photographs of Marine Mammal Carcasses and Living Animals. James L. Wood Lumatrex, Inc. jlwood@lumatrex.com. 1. Goals For These Methods. Use Photographs of Propeller Cuts Suitable For Carcasses and Living Animals

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Evaluating Propeller Cuts

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  1. Evaluating Propeller Cuts Evaluating Propeller Cuts Using Photographs of Marine Mammal Carcasses and Living Animals James L. Wood Lumatrex, Inc. jlwood@lumatrex.com 1

  2. Goals For These Methods • Use Photographs of Propeller Cuts • Suitable For Carcasses and Living Animals • Suitable For Any Size Propeller 2

  3. Current Status • Research and Development Phase Is Complete • Two Test Cases Have Been Evaluated • Proposal Requesting Grants For Preparing A Technical Report Has Been Prepared 3

  4. Test Cases • Right Whale Necropsy – RKB-1424 Uses photographs taken during the necropsy • Right Whale #2425 – Live Individual Uses photographs of living adult animal http://www.lumatrex.com 4

  5. Right Whale Necropsy RKB - 1424 • Calf • Length – 581 cm (19 feet) • Approximate Weight – 4500 lbs • Adult right whale was also present • Struck by USCG Cutter Point Francis • January 5, 1993 • Reported by Commanding Officer 5

  6. Original Necropsy Drawings 6

  7. RKB-1424 Necropsy PhotoCut Series I 7

  8. Evaluation Results - Cut Series I • Created by the USCG Cutter Point Francis (WPB 82356) • Propeller Diameter – 114.6 cm (45 inches) • Propeller Blades – 5 • Propeller Rotation – Clockwise (CW) • Advance Coefficient – 0.65 • Propeller Pitch - > 29 inches • Vessel’s Approach – from directly ahead of whale • First Propeller Strike – Cut #18 • Initial Speed of Whale – 4.8 knots • Maximum Speed of Whale – 6.6 knots (Cut #11) • Final Speed of Whale – 0 knots 8

  9. Changes in Speed of Whale 9

  10. Known Details - Vessel • USCG Cutter Point Francis (WPB 82356) • Length – 82 feet • Weight – 67 gross tons • Twin Screws • Propeller Diameter - 3.5 feet (42 inches) • Propeller Blades – 5 • Propeller Pitch – unknown • Average Speed of Vessel 14.2 knots • Rotation Speed of Prop – 600 srpm (Turns for 15 knots) • Advance Coefficient @ 14.2 knots and 600 srpm – 0.68 10

  11. RKB-1424 Photo Cut Series II 11

  12. Right Whale 2425 • Adult about 11 years old • Estimated Fluke Width – 440 cm • Struck off Cumberland Island, Georgia • March 10, 2005 • Reported by Vessel’s Operator 12

  13. Right Whale 2425 Prop Cuts Wildlife Trust/Georgia DNR 13

  14. Prop CutSeries I on Left Fluke 14 New England Aquarium

  15. Prop Cut Series I on Left Fluke 15 New England Aquarium

  16. Evaluation Results - Cut Series I • Propeller Diameter – 64 cm (25 inches) • Propeller Blades – 4 • Propeller Rotation – Counter Clockwise • Vessel Advance Coefficient – 1.05 • Propeller Pitch - > 27 inches 16

  17. Prop Cut Series II Wildlife Trust/Georgia DNR 17

  18. Evaluation Results - Cut Series II • Propeller Diameter – 72 cm (28 inches) or 63 cm (25 inches) • Propeller Blades – 4 • Propeller Rotation –Clockwise • Vessel Advance Coefficient – 0.80 or 0.90 • Propeller Pitch - > 23 inches 18

  19. Evaluation Results - Combined • Propeller Diameter – 66 cm (26 inches) • Propeller Blades – 4 • Propeller Pitch - > 25 in. (Prop Advance – 25 in.) • Vessel Advance Coefficient – 0.92 • Vessel’s Length – 40 to 50 feet • Vessel’s Beam – Approx. 13 feet • Vessel’s Approach – from right rear of whale • Whale’s Fluke Width – 494 cm 19

  20. Vessel Allegedly Involved 20

  21. 500 hp Cut Span 21

  22. 500 hp Advance Coefficient 22

  23. 500 hp Slip 23

  24. Vessel Details • Sabreline 42 Express Cruiser • Length – 42’ 3” • Beam – 14’ 4” • Weight – 29,000 lbs. • Twin Screws • Propeller Diameter - 26 inches • Propeller Blades – 4 • Propeller Pitch – 35 inches (Prop Advance – 24.5 inches) • Gear Ratio – 2.227:1 • Engine Speed @ 20 Knots – 2227 rpm • Propeller Speed @ 20 Knots – 1000 rpm • Advance Coefficient @ 20 knots – 0.94 24

  25. Goals Achieved • Uses Photographs of Propeller Cuts • Suitable for Carcasses and Living Animals • Suitable for Any Size Propeller 25

  26. Future Actions • Prepare a technical report documenting these methods • Have technical report peer reviewed and published • Develop computer software to automate the calculations included in these methods 26

  27. Right Whale Necropsy – RKB-1424 • Right Whale #2425 – Live Individual http://www.lumatrex.com Proposal for Technical Report James L. Wood jlwood@lumatrex.com 321-956-1939 27

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