DE19840339A1 - Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region - Google Patents

Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region

Info

Publication number
DE19840339A1
DE19840339A1 DE1998140339 DE19840339A DE19840339A1 DE 19840339 A1 DE19840339 A1 DE 19840339A1 DE 1998140339 DE1998140339 DE 1998140339 DE 19840339 A DE19840339 A DE 19840339A DE 19840339 A1 DE19840339 A1 DE 19840339A1
Authority
DE
Germany
Prior art keywords
propeller
water
ground
negative pressure
low pressure
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.)
Withdrawn
Application number
DE1998140339
Other languages
German (de)
Inventor
Manfred Meincke
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
Priority to DE1998140339 priority Critical patent/DE19840339A1/en
Priority to EP99953660A priority patent/EP1107906B1/en
Priority to PCT/DE1999/002747 priority patent/WO2000013966A1/en
Priority to AU10300/00A priority patent/AU1030000A/en
Priority to AT99953660T priority patent/ATE248100T1/en
Priority to DE59906792T priority patent/DE59906792D1/en
Publication of DE19840339A1 publication Critical patent/DE19840339A1/en
Withdrawn legal-status Critical Current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
    • B63H1/26—Blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for outboard marine engines

Abstract

The propeller is ground so that the quarter-arc from the apex line of the leading edge is taken away as far as the low pressure side. This prevents water being forced by the rotary motion of the propeller to the low pressure side. This is more important in the case of thick aluminum blades than in the case of thin steel ones. The propeller is just as stable, because it is less loaded at this point.

Description

Erhöhung des Wirkungsgrades von propellergetriebenen Bootsantrieben (vorwiegend bei Außenbord- bzw. Z-Antrieb) durch Veränderungen am Propeller.Increase the efficiency of propeller driven Boat drives (mainly with outboard or sterndrive) Changes to the propeller.

Alle üblichen Propellerblätter sind an den durchs Wasser schneidenden Kanten (Eintrittskanten) abgerundet, und zwar auf der Unterdruck- und Überdruckseite gleich (Halbkreis Fig. 1 A) oder sie sind sogar stumpf belassen. Dadurch wird das von den Eintrittskanten verdrängte Wasser teilweise auch in den Unterdruckbereich gelenkt und wirkt dem anströmenden Wasser entgegen. Der Unterdruck wird also um diese Wassermenge verringert und ein unnötiger Reibungswiderstand an der Blattkante hingenommen. Auf den Überdruckseiten der Eintrittskanten ist der Viertelbogen ab Scheitellinie hydrodynamisch nicht ideal, weil hier Wasser auf die Blätter transportiert werden soll.All usual propeller blades are rounded at the edges cutting through the water (leading edges), namely on the negative pressure and positive pressure side the same (semicircle Fig. 1A ) or they are even left blunt. As a result, the water displaced by the leading edges is also partially directed into the negative pressure area and counteracts the inflowing water. The vacuum is reduced by this amount of water and an unnecessary frictional resistance is accepted at the edge of the sheet. On the overprinting sides of the leading edges, the quarter curve from the apex line is not ideal hydrodynamically, because here water is to be transported onto the leaves.

Claims (1)

Die Propellerflügel werden an der Eintrittskante so beschliffen, daß kein Wasser mehr durch Drehbewegung in den Unterdruckbereich verdrängt werden kann. Das geschieht durch Wegnahme der Viertelbogen von der Scheitellinie der Eintrittskante bis zur Unterdruckseite. Etwaige strömungstechnische Figuren sind bei diesem Schliff nicht zu beachten, weil auf der Unterdruckseite der Flügel kein Wasser verdrängt wird, sondern ein Unterdruck aufgebaut wird. Die auf den Überdruckseiten verbleibenden Viertelbogen der Eintrittskanten werden elliptisch geschliffen (Fig. 1 B). Bei dicken Aluminiumflügeln ist dieses wichtiger als bei den dünnen Edelstahlflügeln. Die Stabilität des Propellers wird durch diese Maßnahmen nicht beeinflußt, weil er an dieser Stelle am geringsten belastet wird. Durch diesen Eingriff wird der Wirkungsgrad des Propellers erhöht (weniger Schlupf), weil der Unterdruck vergrößert und der Wasserwiderstand auf den Eintrittskanten verringert wird. Der seitliche Heckversatz des Bootes durch Drehung des Propellers (scheinbar über Grund laufend zur Seite hin je nach Drehrichtung des Propellers) verringert sich ebenfalls.The propeller blades are ground at the leading edge in such a way that no more water can be displaced into the negative pressure area by rotary movement. This is done by removing the quarter bend from the apex line of the leading edge to the negative pressure side. Any aerodynamic figures are not to be considered with this cut, because on the negative pressure side of the wing no water is displaced, but a negative pressure is built up. The quarter arches of the leading edges remaining on the overprint pages are ground elliptically ( Fig. 1 B). With thick aluminum wings this is more important than with thin stainless steel wings. The stability of the propeller is not affected by these measures because it is the least stressed at this point. This intervention increases the efficiency of the propeller (less slip) because the vacuum increases and the water resistance on the leading edges is reduced. The lateral rear offset of the boat due to the rotation of the propeller (apparently running to the side depending on the direction of rotation of the propeller) also decreases.
DE1998140339 1998-09-04 1998-09-04 Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region Withdrawn DE19840339A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE1998140339 DE19840339A1 (en) 1998-09-04 1998-09-04 Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region
EP99953660A EP1107906B1 (en) 1998-09-04 1999-08-27 Device for propulsion of a boat
PCT/DE1999/002747 WO2000013966A1 (en) 1998-09-04 1999-08-27 Device for propulsion of a boat
AU10300/00A AU1030000A (en) 1998-09-04 1999-08-27 Device for propulsion of a boat
AT99953660T ATE248100T1 (en) 1998-09-04 1999-08-27 DEVICE FOR DRIVING A BOAT
DE59906792T DE59906792D1 (en) 1998-09-04 1999-08-27 DEVICE FOR DRIVING A BOAT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998140339 DE19840339A1 (en) 1998-09-04 1998-09-04 Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region

Publications (1)

Publication Number Publication Date
DE19840339A1 true DE19840339A1 (en) 2000-03-09

Family

ID=7879794

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998140339 Withdrawn DE19840339A1 (en) 1998-09-04 1998-09-04 Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region

Country Status (1)

Country Link
DE (1) DE19840339A1 (en)

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Legal Events

Date Code Title Description
ON Later submitted papers
8122 Nonbinding interest in granting licenses declared
8139 Disposal/non-payment of the annual fee