baber/WOPTO huggingface dataset:
Patent RU-2075899-C1 (RU)
Title: Устройство для коррозионных испытаний
IPC: G01N17/00
Filed: 1992-10-08
Granted: 1997-03-20
Abstract: Устройство для коррозионных испытаний, содержащее камеру с нагревателем, размещаемый в камере испытуемый объект, средства подачи раствора соли, соединенные с ними электропневмоклапаны и связанные с последними установленные в камере распылительные сопла, отличающееся тем, что оно снабжено располагаемыми на поверхности испытуемого объекта датчиками толщины слоя раствора соли на этом объекте, каждый из которых размещен в зоне действия соответствующего сопла, соединенными с датчиками усилителями и связанными с усилителями элементами релейного типа с тиратронами, контакты которых включены в цепи управления электропневмоклапанов, а распылительные сопла размещены в шахматном порядке так, что перекрытие двух соседних зон распыления на испытуемом объекте составляет 3 - 6% от их общей площади.
Patent RU-2027914-C1 (RU)
Title: Blade rotor
Inventor: CHERNOV EVGENIJ N
IPC: F04D29/66
Filed: 1992-09-28
Granted: 1995-01-27
Abstract: FIELD: in pumps, turbines, fans. SUBSTANCE: hub with blades is mounted on shaft by means of shock absorbers. Shock absorber is assembled of several flexible members; hub consists of blade bases mounted in spaced relation to each other; each base holds one blade. Each base is connected with shaft by ends opposite in height of at least two flexible members which are located on different sides relative to chord of root section of respective blade; they are oriented to rotor axis by width within right angle where chord lies; they are rigid in direction of their height. EFFECT: enhanced reliability. 3 dwg
Patent RU-2031170-C1 (RU)
Title: Method of alloy preparing for magnetic material making
Inventor: LEBEDEV GENNADIJ A
IPC: C22C1/04
Filed: 1992-09-14
Granted: 1995-03-20
Abstract: FIELD: alloy metallurgy. SUBSTANCE: method involves combined reduction of a mixture of rare-earth metal oxides, transient metals, alloying metals and intercalation compound by carbothermic method. Source raw: complex oxides NdFeO 3   and NdBO 3 , iron pellets with oxygen content 2 wt.-%, and ferroalloys. Oxides NdFeO 3   and NdBO 3  and carbon were added to the charge in the form of pelletized briquets, and iron pellets and ferroalloys were added to the charge separately. EFFECT: improved method of alloy preparing.
Patent DE-10039913-C1 (DE)
Title: Device to adjust relative rotation angle between camshaft and drive wheel of internal combustion engine; has inner part fixed to cam shaft and driven cellular wheel that can be locked together
Inventor: SLUKA GEROLD
IPC: F01L1/344
Filed: 2000-08-16
Granted: 2001-10-18
Abstract: The device has an inner part (4) fixed to a cam shaft (2), which has radial blades, and a driven cellular wheel (12), which is separated into several cells by bars, which are divided by the blades of the inner part into two pressure spaces (26b). Hydraulic action through control lines rotates the cam shaft between two end positions with respect to the cellular wheel.  At least one locking unit between the inner part and the cellular wheel locks the inner part in at least one end position opposite the cellular wheel. At least one blade of the inner part has a head part (58) with at least one locking element, which co-operates with a locking structure on at least one bar of the cellular wheel. The head part slides radially and can be guided into locked or unlocked positions according to the operation parameters.
Patent DE-10045066-C1 (DE)
Title: Vehicle rear seat has adjustable seat part and pivoting backrest supported by connection device having elastic tube element filled with adjacent roller bodies
Inventor: ROEMER BERND
IPC: B60N2/04
Filed: 2000-09-12
Granted: 2002-01-03
Abstract: The seat has an adjustable seat part (1) and a pivoting backrest (2), which is supported by a connection device (5) fixed to the backrest side against a fixed chassis area, to guide the backrest movement automatically when the seat part is adjusted. The connection device (5) has an elastic tube element in the vehicle longitudinal direction, whose inner space is filled with adjacent roller bodies. The roller bodies roll inside the tube when the backrest head is moved. The tube element is connected between the backrest frame and the fixed chassis area.
Patent DE-10045136-C1 (DE)
Title: Weighing device has one of bridge lever arms supporting adjustment weight acting as conversion lever coupling load to measuring transducer
Inventor: SCHULZE WERNER
IPC: G01G23/01
Filed: 2000-09-13
Granted: 2002-03-07
Abstract: The weighing device has a load reception part (2) coupled via a pair of deflection arms (3,4) with a stationary housing part (1), with at least one conversion lever (7,11,17) coupling the load to a measuring transducer (18). An adjustment weight, used checking and/or re-adjusting the accuracy of the weighing device, is supported from 2 bridge lever arms (11,21), at least one of which acts simultaneously as a conversion lever.
Patent DE-10048507-C1 (DE)
Title: Plug part of BNC plug connector for coaxial cable has bayonet sleeve operated via separate operating sleeve at rear of plug part
Inventor: WEINGARTNER BERNHARD
IPC: H01R13/646
Filed: 2000-09-29
Granted: 2002-03-28
Abstract: The connector plug part has a plug body (1) provided with a front outer contact part (5), electrically coupled to a rear termination region (6) for cooperating with the outer conductor of a coaxial cable and enclosing an insulation part (8) having a central opening (9) receiving a contact pin (10) which is coupled to the inner conductor of the coaxial cable. The rotatable bayonet sleeve (2) fitted to the plug body is operated via a separate operating sleeve (19), projecting rearwards beyond the rear termination region.
Patent DE-10114751-C1 (DE)
Inventor: SCHULZ DETLEF
IPC: G01L9/00
Filed: 2001-03-22
Granted: 2002-11-21
Abstract: The invention relates to a pressure sensor comprising a housing (12), a membrane (26) arranged in said housing and which can be deflected by the pressure to be measured, a light source (LED) having an optical axis, a light detector having an optical axis and a light blocker (36) that is coupled to the membrane and that can be deflected thereby, the blocker being arranged in the beam path of the light source. The light source and the light detector are arranged inside the housing (12), wherein their optical axes lie parallel to one another. A first prism (40) is assigned to the light source and a second prism (42) is assigned to the light detector in such a way that an uninterrupted beam path from the light source through both prisms to the light detector is obtained. To this end, the light blocker (36) is arranged between the two prisms.
Patent DE-10118510-C1 (DE)
Title: System zum Auf- und Abladen von Landfahrzeugen für deren Transport auf dem Schienenweg
Inventor: SKIBBE EBERHARD
IPC: B61D47/00
Filed: 2001-04-12
Granted: 2002-08-29
Abstract: Die Erfindung betrifft ein System zum Auf- und Abladen von Landfahrzeugen für deren Transport auf dem Schienenweg, mit Niederflurwagen (5), auf die jeweils auf einer Gleistraverse (1) um eine vertikale Achse mittels einer Hydraulik (1d) aus der Fahrtrichtung geschwenkt werden, so dass die Stirnseiten der Ladeplattformen der Niederflurwagen (5) niveaugleich zwischen Straßenanschlüssen (8) geführt sind. Im Zentrum der Gleistraverse (1) ist eine Multifunktionseinrichtung (2) eingelagert, die einerseits über ein Ring-Gleitlager (3a) die Traverse (1) mittig hält und andererseits im Innenraum die Vorrichtungen zur Feinpositionierung und Arretierung der Niederflurwagen (5) sowie für die Vorbereitung zu deren Trennung von den Nachbarwaggons beherbergt. DOLLAR A Ziel ist es, wie im Hauptpatent 19949201, Landfahrzeuge, vorrangig Lastwagen, unmittelbar an den Autobahnen aufzunehmen und sie wie eine "Landfähre" nach Erreichen der Zielregion wieder an der Autobahn abzusetzen. Durch den Einsatz von bereits eingeführten Niederflurwagen ist dabei sicherzustellen, dass der Transport mit Fahrzeugen innerhalb von Lichtraumprofilen der heutigen "Rollenden Landstraße" betrieben werden kann. DOLLAR A Hierzu gibt die Erfindung ein neues, kostengünstiges System an, um die Landfahrzeuge nahe der Autobahn wie eine "Landfähre" minutenschnell zu verladen, die "Rollende Landstraße" zu verbessern und allgemein wiederzubeleben. Ein Auf- und Abladen an Zwischenstationen für den regionalen Quell- und Zielverkehr ist ...
Patent DE-10132842-C1 (DE)
Title: Transesterification of fats and/or oils by alcoholysis, e.g. for preparation of methyl esters useful as diesel fuel, with addition of alkanol fatty acid ester to give single-phase reaction mixture and high reaction velocity
Inventor: PETER SIEGFRIED
IPC: C07C67/03
Filed: 2001-07-06
Granted: 2002-11-28
Abstract: In the transesterification of fats and/or oils by alcoholysis, involving contacting the fat and/or oil with an excess of an alkanol, at least one alkanol fatty acid ester (I) is added to the fat and/or oil in sufficient amount to give a single-phase reaction mixture.
Patent DE-10141992-C1 (DE)
Title: Filtervorrichtung, insbesondere für Hochdruckanwendungen bei einer Polymerschmelze-Filtration
Inventor: WNUK RALF
IPC: B29C48/03
Filed: 2001-08-28
Granted: 2003-04-24
Abstract: Die Erfindung betrifft eine Filtervorrichtung, insbesondere für Hochdruckanwendungen bei einer Polymerschmelze-Filtration, mit einem Einschraubteil (10), das zum Festlegen der Filtervorrichtung mit einem ersten Gewindeabschnitt (12) versehen ist, das einen zweiten Gewindeabschnitt (14) aufweist zum Festlegen eines Filtermediums (16), insbesondere in Form eines Metallvlieses, und das für das Metallvlies ein perforiertes Stützrohr (18) aufweist, das an seinem anderen freien Ende mit einem Volumenverdränger (24) versehen ist, wobei das Metallvlies von einem Stützgitter (20) umgeben an zwei Festlegeteilen (28, 30) gehalten ist, die über das Stützgitter (20) auf Abstand gehalten zum einen (28) dem Festlegen am zweiten Gewindeabschnitt (14) des Einschraubteils (10) dienen und zum anderen eine Handhabe (30) für das dahingehende Festlegen darstellen. Dadurch, daß der Volumenverdränger (24) einstückiger Bestandteil des Stützrohres (18) ist und daß das als Handhabe ausgebildete Festlegeteil (30) den Volumenverdränger (24) übergreift, ist die Filtervorrichtung dahingehend weiter verbessert, daß sie zum einen einen einfachen und raschen Montagevorgang für das auszutauschende Filtermedium erlaubt und zum anderen die Filterelement-Konstruktion frei von schädlichen Torsionsbeanspruchungen gehalten ist.
Patent DE-10148294-C1 (DE)
Title: Mold half for corrugator, for producing ribbed conduits, has semi-cylindrical inner surface, fittings with concave inner surface alternating with fittings with convex inner surface being fitted on it
Inventor: NEUBAUER GERHARD
IPC: B29C48/13
Filed: 2001-09-29
Granted: 2003-01-16
Abstract: Mold half for a corrugator for producing ribbed conduits has a semi-cylindrical inner surface (14). Fittings (22) with a concave inner surface (26) alternating with fittings (20) with a convex inner surface (24) are fitted in recesses (30) in the end face (12) of the mold half so that their front surfaces are flush with it.
Patent DE-10202799-C1 (DE)
Title: Massagegerät
Inventor: SCHEIB OLIVER
IPC: A61H7/00
Filed: 2002-01-25
Granted: 2003-08-14
Abstract: Die Erfindung betrifft ein Massagegerät mit sich bewegenden Massagenocken. Um hier eine besonders gut massierende Knetwirkung der Nocken zu erreichen wird vorgeschlagen, die Massagenocken an Enden von wenigstens paarweise vorhandenen und nebeneinander angeordneten Schwingen vorzusehen, die zueinander phasenversetzt antreibbar sind.
Patent DE-19509081-C1 (DE)
Title: Length adjustable ski stick
Inventor: REUKAUF VEIT-ULLRICH
IPC: A45B9/00
Filed: 1995-03-16
Granted: 1996-06-05
Abstract: The ski stick has expanding bolts at the bottom screwing into an expanding support sleeve (4).  The sleeve has one or two detent collars (4a,b) which engage in conically extending detent grooves provided on the top part of the stick.  The top and bottom parts of the stick have elliptical cross-sections forming an anti-rotation lock for the support sleeve and bolts.The upper part of the stick has an axial guide groove engaging in the guide nose of the support sleeve.  The eccentric part mounted on the expanding bolt is formed as a double or multi eccentric. The support sleeve is reset by a resetting spring.  The support sleeve is made of plastics or metal.
Patent DE-19520642-C1 (DE)
Inventor: BLUMOER JOACHIM
IPC: H02P6/04
Filed: 1995-06-09
Granted: 1996-12-05
Abstract: The control operates on the individual brushless DC motors (2.1-2.N) driving the cylinders (1.1-1.N) in synchronism. High-resolution incremental encoders (3.1-3.N) supply signals to the controller (6) in conjunction with outputs from encoders (4.1-4.N) of lower resolution coupled directly to the motors. The axes of the motors are adjusted by individual drive controls (5.1-5.N) to maintain the same relative angular positions. When any component of a drive unit fails, all other drive units are run down to standstill in synchronism according to a temporal function provided for the defective unit and reproduced by the control signal.
Patent DE-19524936-C1 (DE)
Title: Divergent, optical, gaussian, elliptical radiation converting device, e.g for tunnelling guide
Inventor: EHBETS HARTMUT
IPC: G02B27/09
Filed: 1995-07-08
Granted: 1996-11-21
Abstract: A device is disclosed for transforming a divergent radiation beam with an elliptically symmetrical gaussian intensity distribution in its cross-section, in which intensities decrease outwards from the beam axis, into a radiation beam with a rotationally symmetrical gaussian intensity distribution in its cross-section, in which the intensities decrease outwards. Mirror symmetrical filters with a space-dependent gaussian transmission curve are used for that purpose. The centre of a radiation beam that falls on a surface may thus be quickly and unambiguously determined for measurement purposes, even in the presence of diffused light. In addition, the high temperature and vibration stability of the device allow it to be used without problems in the field.
Patent DE-19636480-C1 (DE)
Title: Glass fabric-backed adhesive tape having enhanced durability and UV resistance
Inventor: ENSLIN LUDWIG
IPC: C09J183/04
Filed: 1996-09-07
Granted: 1997-09-25
Abstract: The use of an adhesive tape for fastening a fibre-optic cable to the carrying or earthing cable of a high voltage line or similar conductor system is claimed, the tape comprising an adhesive coating on a woven glass backing layer and having a thickness of 0.05-0.5 (preferably 0.18) mm, a maximum tension of 300-500 (preferably 400) N/cm and a tear elongation of 3-10 (preferably 7)%.  Preferably, the adhesive is an aging-resistant thermosetting silicone rubber-based adhesive which may be reinforced with nylon or Kevlar (RTM) filaments or metal wire.
Patent DE-19806372-C1 (DE)
Title: Sock for people with reduced sensitivity in foot area
Inventor: WAGNER JOACHIM
IPC: A41B11/00
Filed: 1998-02-17
Granted: 1999-05-12
Abstract: The sock has a tubular attaching piece (3) and an adjoining foot part (2).The foot part (2) resembles a bag and the attaching piece (3) is associated with an extension (4) which adjoins the piece (3) and is closed at the end (5) facing away from the foot part (2). This end (5) can be inverted into a point(9) of the foot part (2) to form an inner sock (7) and an outer sock (6).
Patent DE-19817632-C1 (DE)
Title: Round deformation of surface in steel work piece used to make e.g. slide bearings
Inventor: LINDNER HORST
IPC: B23P9/00
Filed: 1998-04-21
Granted: 1999-11-11
Abstract: A depression (8,9) penetrating the tempered edge layer (7) is made in an end wall (5,6) of the work piece (1) adjacent to the main surface. An Independent claim is also included for the work pieces made by this method.
Patent DE-19826661-C1 (DE)
Title: Self-winding cable reel for electrical lead cable
Inventor: STEINMUELLER JOERG
IPC: B65H75/44
Filed: 1998-06-16
Granted: 1999-10-21
Abstract: The self-winding cable reel has a base plate (1) with a bearing pin (2) supporting a cable drum (3) which has an axial extension (39) received in a U-shaped channel in the surface of the base plate, provided with an attached wind-up spring (8), braking roller (11) acting against the inside surface of the axial extension. A central annular wall of the base plate receives contact rings (12,13) cooperating with sliding contacts (14,15) attached to the cable drum.
Patent DE-19845699-C1 (DE)
Title: Method of interactive control of measurement or evaluation processes in chromatography, spectroscopy or electrophoresis
Inventor: BAESMANN CARSTEN
IPC: G01N21/01
Filed: 1998-10-05
Granted: 1999-12-02
Abstract: The method involves dragging and dropping a peak or peak region by clicking a mouse on it and dragging it into a target window to copy selected numerical data from the peak or peak region.  The selection of the copied data, the representation of the data in the target window and the further use or processing of the data by the data processing system depend on the selected target window.
Patent RU-2062602-C1 (RU)
Inventor: DZHON ENTONI KHOLLAND
IPC: A47L9/08
Filed: 1991-10-02
Granted: 1996-06-27
Abstract: Иcпoльзoвание: изобретение относится к насадкам, устанавливаемым на аппаратах всасывания, и может быть использовано для чистки со смачиванием ковров и других натуральных и синтетических напольных покрытий, включая ковры ворсистого типа и т.п. Сущность изобретения: всасывающая чистящая насадка включает в себя камеру всасывания с входным и выходным отверстиями, последнее из которых выполнено с возможностью соединения с устройством обработки воздуха, а также камеру моющей жидкости с входным и выходным отверстиями, первое из которых выполнено с возможностью соединения с источником жидкости. В камере моющей жидкости у ее выходного отверстия установлено устройство ограничения потока с образованием каналов подачи жидкости на обрабатываемую поверхность, которые могут быть выполнены как в упомянутом устройстве, так и в стенках камеры моющей жидкости. Устройство ограничения потока может быть установлено как с внешней стороны камеры моющей жидкости с охватом ее стенок, так и внутри этой камеры и иметь различную конфигурацию нижней поверхности, соприкасающейся с обрабатываемой поверхностью. 22 з. п. ф-лы, 22 ил.
Patent RU-2043433-C1 (RU)
Inventor: CHELYSHEV ANATOLIJ M
IPC: D02G3/46
Filed: 1993-02-03
Granted: 1995-09-10
Abstract: Использование: текстильная промышленность, производство швейных ниток. Сущность изобретения: для получения швейной нитки линейной плотности 22 200 текс тоостят в два и более сложений полиэфирные комплексные нити с крутой 200 круч/м левого направления, а замтем осуществляют кручение трошенных нитей в противоположном направлении с круткой, составляющей 1,6 2,0 исходной крутки нитей, после чего нитку подвергают термофиксации и крашению. Способ позволяет снизить жесткость швейной нити и улучшить ее пошивочные свойства.
Patent RU-2083437-C1 (RU)
Title: Dragon-fly flying vehicle
Inventor: ISMAGULOV VLADIMIR ZH
IPC: B64C27/22
Filed: 1993-02-26
Granted: 1997-07-10
Abstract: FIELD: aeronautical engineering. SUBSTANCE: flying vehicle has fuselage, landing gear, tail unit, power plant, tractor propeller and windmilling rotors. Flying vehicle is additionally provided with two windmilling propellers interconnected by means of synchronizing shafts fitted with hubs where blades are articulated for axial turn and longitudinal motion of blades in hinges whose axes coincide with longitudinal axis of blade; centers of masses and pressure of blade are located behind axis of its suspension; each blade is provided with torsion bar mounted inside it which connects bush and blade with travel limiter of axial hinge; tractor propeller is mounted on extension beam in upper nose portion of fuselage. EFFECT: enhanced reliability. 17 dwg
Patent RU-2072845-C1 (RU)
Inventor: ERMOLEV SERGEJ N
IPC: A61K31/485
Filed: 1993-03-29
Granted: 1997-02-10
Abstract: Изобретение относится к медицине, в частности, к стоматологии и касается разработки средств для профилактики и лечения гипоксических состояний пародонта. В качестве такого средства предлагается гидрохлорида 6,7-диметокси-1-(3,4-диметоксибензил)-изохинолин, (папаверина гидрохлорид). Препарат обладает выраженным продолжительным действием на ткани пародонта в условиях циркуляторной гипоксии, ишемии, превосходящим на 20-40% подобное действие аналогов. 6 табл. 1 ил.
Patent RU-2059597-C1 (RU)
Title: Method of 3-methyl-1-butyne-3-ol synthesis
Inventor: TROFIMOV BORIS A
IPC: C07C29/42
Filed: 1993-04-22
Granted: 1996-05-10
Abstract: FIELD: organic chemistry. SUBSTANCE: product: 3-methyl-1-butyne-3-ol. Reagent 1: acetylene. Reagent 2: acetone. Reaction conditions: in dimethylsulfoxide medium containing 3-5% water, in the presence of potassium hydroxide semihydrate, under atmospheric pressure, at 10-30 C, at molar ratio acetylene:acetone = 0.2-0.6 followed by neutralization of catalyst used. Synthesized compound is used as a component to the engine fuel. EFFECT: improved method of synthesis. 2 cl
Patent RU-2039068-C1 (RU)
Title: Copolymers of esters of 2-cyan acrylic acid and silicium-containing methacrylates for plasma resistant resistor superthin coatings
Inventor: MAGER KIRA A
IPC: C08F230/08
Filed: 1993-07-26
Granted: 1995-07-09
Abstract: FIELD: molecular electronics. SUBSTANCE: copolymers of esters of 2-cyan acrylic acid and silicium-containing methacrylates having common formula {[-CH 2 -C(CN)/COOR-] m -[-CH 2 -C(CH 3 )-(COOR 1 )-] n } k  where R C 2 H 5 -C 10 H 21  CH 2 -CH=CH 2  CH 2 -CH 2 -OCH 2 -CH=CH 2  CH 2 CF 2 -CF 2 H CH 2 COOCH 2 CF 2 CF 2 H CH 2 COOCH 2 =CH 2  R 1  CH 2 -Si(CH 3 ) 2 -O-Si-(CH 3 ) 3  CH 2 -Si(CH 3 ) 3  CH 2 CH 2 CH 2 CH 2 -Si(CH 3 ) 2 -O-Si-(CH 3 ) 3 , m= 99-1 mol n=1-99 mol k=m+n are prepared by mass or solution copolymerization at 30-100 C. The process takes place in the presence of radical initiators within 3-20 h. Yield of said copolymers is 48-85 EFFECT: improves quality of desired product. 1 tbl
Patent RU-2084778-C1 (RU)
Inventor: ZHERDEV VIKTOR N
IPC: F25B9/00
Filed: 1993-08-31
Granted: 1997-07-20
Abstract: Использование: в области энергетики на тепловых электростанциях для снижения давления и температуры перегретого пара. Сущность изобретения: для снижения параметров перегретого пара с аккумуляцией тепла в замкнутом объеме в качестве рабочей среды применяют водяной перегретый пар высокого давления, который в процессе политропного расширения используют для одновременного попеременного сжатия газа в объеме. 2 ил.
Patent RU-2067591-C1 (RU)
Title: СПОСОБ ВЫДЕЛЕНИЯ МАСЛОНАПОЛНЕННОГО БУТАДИЕН-( α -МЕТИЛ)-СТИРОЛЬНОГО КАУЧУКА
Inventor: NIKULIN SERGEJ SAVVOVICH
IPC: C08C1/15
Filed: 1993-09-07
Granted: 1996-10-10
Abstract: Использование: производство маслонаполненного бутадиен-(a-метил)-стирольного каучука. Сущность изобретения: при получении маслонаполненного бутадиен-(a-метил)-стирольного каучука на стадии выделения осуществляют смешение водного раствора коагулянта с маслом с получением масляной эмульсии. В качестве водного раствора коагулянта используют 1 - 50 % раствор полидиметилдиаллиламмонийхлорида, взятого в качестве на сухое вещество в количестве 1,5 - 2,0 кг/т каучука. Затем осуществляют смешение каучукового латекса с масляной эмульсией, подкисленным серумом и минеральной кислотой. 2 табл.
Patent RU-2065375-C1 (RU)
Title: Water-jet propeller total-head water scoop
Inventor: SOLOVEV ALEKSANDR P
IPC: B63H11/103
Filed: 1993-09-13
Granted: 1996-08-20
Abstract: FIELD: shipbuilding; water scoops of ships with deeply submerged intake portion. SUBSTANCE: inner part of pipe line laid in force portion is made with artificial roughness and segment-type hydrodynamic profiles are located vertically in aft portion of pipe line. Distance between blades shall ensure uniform velocity of flow at guide vane outlet. EFFECT: increased thrust and enhanced efficiency of propeller. 2 dwg