GB951661A - Improvements in or relating to marine craft employing jet propulsion apparatus - Google Patents

Improvements in or relating to marine craft employing jet propulsion apparatus

Info

Publication number
GB951661A
GB951661A GB2608/61A GB260861A GB951661A GB 951661 A GB951661 A GB 951661A GB 2608/61 A GB2608/61 A GB 2608/61A GB 260861 A GB260861 A GB 260861A GB 951661 A GB951661 A GB 951661A
Authority
GB
United Kingdom
Prior art keywords
gas
water
discharge
ducts
recesses
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
GB2608/61A
Inventor
Harry Lyttelton Dowsett
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.)
DOWSETT HOLDINGS Ltd
Original Assignee
DOWSETT HOLDINGS Ltd
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 DOWSETT HOLDINGS Ltd filed Critical DOWSETT HOLDINGS Ltd
Priority to GB2608/61A priority Critical patent/GB951661A/en
Publication of GB951661A publication Critical patent/GB951661A/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
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type

Landscapes

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

Abstract

951,661. Reducing surface friction; hydraulic jet propulsion. DOWSETT HOLDINGS Ltd. April 18, 1962 [Jan. 23, 1961 (3); May 16, 1961], Nos. 2608/61, 2609/61, 2611/61 and 17707/61. Headings B7A, B7M and B7V. A marine craft 1 provided with jet propulsion of the type having at least one pump 6 which draws water through an inlet duct 7 having one or more openings and delivers it through one or more discharge ducts 8, has at least one longitudinal recess 2 provided in the underside of the hull and means for introducing air or other gas into the recess to form a gas cushion. In Figs. 1 and 2 the recesses 2 have riser portions 9, through which the ducts 8 discharge, and portions 5 which slope upwards from the aft. The recesses 2 are separated by a keel member 3. The pumps 6 are driven through gearings 10 by gas turbines 11, the exhausts from which are led to the recesses by ducts 12 to be discharged in the same general direction as the water jets. The exhaust gas discharge orifice may be situated between transversely spaced water discharge orifices so that the water jets form lateral curtains to contain the gas. The water and gas discharge ducts may be concentric so that one fluid may act as an ejector for the other. The gas may be bled from the gas turbine compressor. Control valves may be provided in the discharge ducts and deflectors in the recesses. Supplementary water discharge orifices may also be provided for movement control of the craft. The gas turbines may be vented to atmosphere when starting or going slowly. The water jet may be discharged through the transom.
GB2608/61A 1961-01-23 1961-01-23 Improvements in or relating to marine craft employing jet propulsion apparatus Expired GB951661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2608/61A GB951661A (en) 1961-01-23 1961-01-23 Improvements in or relating to marine craft employing jet propulsion apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2608/61A GB951661A (en) 1961-01-23 1961-01-23 Improvements in or relating to marine craft employing jet propulsion apparatus

Publications (1)

Publication Number Publication Date
GB951661A true GB951661A (en) 1964-03-11

Family

ID=9742573

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2608/61A Expired GB951661A (en) 1961-01-23 1961-01-23 Improvements in or relating to marine craft employing jet propulsion apparatus

Country Status (1)

Country Link
GB (1) GB951661A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203728A (en) * 1989-07-11 1993-04-20 Yamaha Hatsudoki Kabushiki Kaisha Watercraft with a couple of water jet propulsion units

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203728A (en) * 1989-07-11 1993-04-20 Yamaha Hatsudoki Kabushiki Kaisha Watercraft with a couple of water jet propulsion units

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