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WO2001085267A3 - Methods for creating large scale blade deflections in swim fins - Google Patents

Methods for creating large scale blade deflections in swim fins Download PDF

Info

Publication number
WO2001085267A3
WO2001085267A3 PCT/US2001/015445 US0115445W WO0185267A3 WO 2001085267 A3 WO2001085267 A3 WO 2001085267A3 US 0115445 W US0115445 W US 0115445W WO 0185267 A3 WO0185267 A3 WO 0185267A3
Authority
WO
WIPO (PCT)
Prior art keywords
hydrofoil
methods
attack
significantly
disclosed
Prior art date
Application number
PCT/US2001/015445
Other languages
French (fr)
Other versions
WO2001085267A2 (en
Inventor
Peter T Mccarthy
Original Assignee
Peter T Mccarthy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/630,374 external-priority patent/US6413133B1/en
Application filed by Peter T Mccarthy filed Critical Peter T Mccarthy
Publication of WO2001085267A2 publication Critical patent/WO2001085267A2/en
Publication of WO2001085267A3 publication Critical patent/WO2001085267A3/en
Priority to US10/877,969 priority Critical patent/US7018256B2/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B31/00—Swimming aids
    • A63B31/08—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs
    • A63B31/10—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet
    • A63B31/11—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet attachable only to the feet
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B31/00—Swimming aids
    • A63B31/08—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs
    • A63B31/10—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet
    • A63B31/11—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet attachable only to the feet
    • A63B2031/115—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet attachable only to the feet with blade at an angle to the plane of the foot when in use, e.g. to reduce plantar flexion

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Toys (AREA)
  • Wind Motors (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

Methods are disclosed to design resilient hydrofoils (164) which are capable of having substantially similar large scale blade deflections under significantly varying loads. The methods permit the hydrofoil (164) to experience significantly large-scale deflections to a significantly reduced angle of attack under a relatively light load while avoiding excessive degrees of deflection under increased loading conditions. A predetermined compression range on the lee portion of said hydrofoil (164) permits the hydrofoil (164) to deflect to a predetermined reduced angle of attack with significantly low bending resistance. This predetermined compression range is significantly used up during the deflection to the predetermined angle of attack in an amount effective to create a sufficiently large leeward shift in the neutral bending surface with the load bearing portions of the hydrofoil (164) to permit the hydrofoil (164) to experience a significantly large increase in bending resistance as increased loads deflect the hydrofoil (164) beyond the predetermined reduced angle of attack. The shift in the neutral bending surface causes a significant increase in the elongation range required along an attacking portion of the hydrofoil (164) after the predetermined angle of attack is exceed. Methods are also disclosed for designing the hydrofoil (164) so that it has a natural resonant frequency that is sufficiently close the frequency of the reciprocating strokes used to attain propulsion in an amount sufficient to create harmonic wave addition that creates an amplified oscillation in the free end of the reciprocating hydrofoil (164). Methods are also disclosed for focusing energy storage and blade deflections along focused regions of load bearing members and the hydrofoil (164). Methods are also disclosed for reducing induced drag vortex formation along the lee surface of the hydrofoil (164), reducing drag and increasing the formation of lift forces.
PCT/US2001/015445 1998-05-14 2001-05-10 Methods for creating large scale blade deflections in swim fins WO2001085267A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/877,969 US7018256B2 (en) 1998-05-14 2004-06-25 Methods for creating large scale focused blade deflections

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US20256000P 2000-05-10 2000-05-10
US60/202,560 2000-05-10
US09/630,374 US6413133B1 (en) 1998-05-14 2000-08-01 Methods for creating consistent large scale blade deflections
US09/630,374 2000-08-01

Publications (2)

Publication Number Publication Date
WO2001085267A2 WO2001085267A2 (en) 2001-11-15
WO2001085267A3 true WO2001085267A3 (en) 2002-03-21

Family

ID=26897801

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/015445 WO2001085267A2 (en) 1998-05-14 2001-05-10 Methods for creating large scale blade deflections in swim fins

Country Status (1)

Country Link
WO (1) WO2001085267A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7101240B2 (en) 1996-01-11 2006-09-05 Mccarthy Peter T High efficiency hydrofoil and swim fin designs
US7581997B2 (en) 1998-05-14 2009-09-01 Mccarthy Peter T Method for creating consistent large scale blade deflections

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6884134B2 (en) * 2002-07-19 2005-04-26 Mccarthy Peter T. High deflection hydrofoils and swim fins
ITTO20060355A1 (en) 2006-05-16 2007-11-17 Technisub Spa FIN FOR SWIMMING
US10843043B2 (en) * 2018-01-04 2020-11-24 Nature's Wing Fin Design, LLC Hydrofoils and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082442A (en) * 1958-09-04 1963-03-26 Spirotechnique Swimmer's fin
US3411165A (en) * 1966-12-12 1968-11-19 Frank N. Murdoch Swim fin
GB1284765A (en) * 1969-07-09 1972-08-09 W W Haffenden Ltd Swim wear
US4007506A (en) * 1975-12-18 1977-02-15 Rasmussen Philip A Swim fin
FR2543841A1 (en) * 1983-04-05 1984-10-12 Rossi Louis Swimming flipper
US5810629A (en) * 1994-03-09 1998-09-22 Atsuko Parr Swimming aid

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950487A (en) 1954-08-09 1960-08-30 Edward F Connors Jr Swimming fin device
US3665535A (en) 1970-08-13 1972-05-30 James B Picken Swim fin
US4689029A (en) 1986-03-21 1987-08-25 Ciccotelli Stephen S Swim fin
US4657515A (en) 1985-11-15 1987-04-14 Ciccotelli Stephen S Swim fin
US4773885A (en) 1986-03-21 1988-09-27 Ciccotelli Stephen S Swim fin with blade displaced from foot pocket
US4934971A (en) 1988-10-31 1990-06-19 Picken James B Swim fin
US4869696A (en) 1988-12-15 1989-09-26 Ciccotelli Stephen S Swim fin
US5746631A (en) 1996-01-11 1998-05-05 Mccarthy; Peter T. High efficiency hydrofoil and swim fin designs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082442A (en) * 1958-09-04 1963-03-26 Spirotechnique Swimmer's fin
US3411165A (en) * 1966-12-12 1968-11-19 Frank N. Murdoch Swim fin
GB1284765A (en) * 1969-07-09 1972-08-09 W W Haffenden Ltd Swim wear
US4007506A (en) * 1975-12-18 1977-02-15 Rasmussen Philip A Swim fin
FR2543841A1 (en) * 1983-04-05 1984-10-12 Rossi Louis Swimming flipper
US5810629A (en) * 1994-03-09 1998-09-22 Atsuko Parr Swimming aid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7101240B2 (en) 1996-01-11 2006-09-05 Mccarthy Peter T High efficiency hydrofoil and swim fin designs
US7581997B2 (en) 1998-05-14 2009-09-01 Mccarthy Peter T Method for creating consistent large scale blade deflections

Also Published As

Publication number Publication date
WO2001085267A2 (en) 2001-11-15

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