GB1325395A - Marine ring propellers - Google Patents

Marine ring propellers

Info

Publication number
GB1325395A
GB1325395A GB1325395DA GB1325395A GB 1325395 A GB1325395 A GB 1325395A GB 1325395D A GB1325395D A GB 1325395DA GB 1325395 A GB1325395 A GB 1325395A
Authority
GB
United Kingdom
Prior art keywords
propeller
shroud
lies
hub
overall diameter
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of GB1325395A publication Critical patent/GB1325395A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/16—Propellers having a shrouding ring attached to blades

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

1325395 Propelling ships R C TOWNSHEND 16 Nov 1971 53051/71 Heading B7V A ring shaped shroud is fixed to the tips of the blades of a marine propeller and has a flat rear face S which lies between sharp edges X and Y and which is perpendicular to the propeller axis. The form of the shroud results in the creation of a triangular section cavity which acts as a vacuum ring to attract cavitation bubbles and the like. The water flow pattern through the propeller is thus stabilized so that the propeller is suitable for use on high speed craft. The inclination A of the shroud to the propeller axis lies between 5 and 15 degrees, the width of the surface S is not less than 20% of the thickness of the shroud cross-section, and the ratio of the length of the shroud to its overall diameter lies between 0À04 and 0À5. The propeller hub may be solid or may be hollow to provide for the emission of engine exhaust gases. The hub diameter is not more than half the overall diameter of the propeller.
GB1325395D 1971-11-16 1971-11-16 Marine ring propellers Expired GB1325395A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5305171 1971-11-16

Publications (1)

Publication Number Publication Date
GB1325395A true GB1325395A (en) 1973-08-01

Family

ID=10466443

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1325395D Expired GB1325395A (en) 1971-11-16 1971-11-16 Marine ring propellers

Country Status (1)

Country Link
GB (1) GB1325395A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434753A1 (en) * 1978-08-30 1980-03-28 Propeller Design Ltd ANNULAR MARINE PROPELLER
US4381901A (en) * 1979-08-17 1983-05-03 Labudde Russell G Anti-cavitation marine propeller
US4569632A (en) * 1983-11-08 1986-02-11 Airflow Research And Manufacturing Corp. Back-skewed fan
JPS6212596U (en) * 1978-08-30 1987-01-26
US5213525A (en) * 1991-06-06 1993-05-25 Sanford Michael P Jacketed marine propeller
GB2352701A (en) * 1999-07-31 2001-02-07 Michael Bill Douglas Purt A ducted marine propeller
CN100371217C (en) * 2004-12-20 2008-02-27 王忠信 Umbrella with wing blades and circular track
US20150203181A1 (en) * 2013-12-17 2015-07-23 RingProp Marine Ltd. Marine propellers

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434753A1 (en) * 1978-08-30 1980-03-28 Propeller Design Ltd ANNULAR MARINE PROPELLER
JPS6212596U (en) * 1978-08-30 1987-01-26
JPH021199Y2 (en) * 1978-08-30 1990-01-11
US4381901A (en) * 1979-08-17 1983-05-03 Labudde Russell G Anti-cavitation marine propeller
US4569632A (en) * 1983-11-08 1986-02-11 Airflow Research And Manufacturing Corp. Back-skewed fan
US5213525A (en) * 1991-06-06 1993-05-25 Sanford Michael P Jacketed marine propeller
GB2352701A (en) * 1999-07-31 2001-02-07 Michael Bill Douglas Purt A ducted marine propeller
CN100371217C (en) * 2004-12-20 2008-02-27 王忠信 Umbrella with wing blades and circular track
US20150203181A1 (en) * 2013-12-17 2015-07-23 RingProp Marine Ltd. Marine propellers
EP2902312A1 (en) * 2013-12-17 2015-08-05 RingProp Marine Ltd. Marine propellers

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee