DE9004412U1 - Solar telescope sail wings with computer-controlled automation for ships and boats - Google Patents
Solar telescope sail wings with computer-controlled automation for ships and boatsInfo
- Publication number
- DE9004412U1 DE9004412U1 DE9004412U DE9004412U DE9004412U1 DE 9004412 U1 DE9004412 U1 DE 9004412U1 DE 9004412 U DE9004412 U DE 9004412U DE 9004412 U DE9004412 U DE 9004412U DE 9004412 U1 DE9004412 U1 DE 9004412U1
- Authority
- DE
- Germany
- Prior art keywords
- wing
- solar
- telescopic
- eegr
- sail
- 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 - Lifetime
Links
- 239000007787 solid Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 244000309464 bull Species 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
- B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
- B63H9/061—Rigid sails; Aerofoil sails
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2221/00—Methods and means for joining members or elements
- B63B2221/20—Joining substantially rigid elements together by means that allow one or more degrees of freedom, e.g. hinges, articulations, pivots, universal joints, telescoping joints, elastic expansion joints, not otherwise provided for in this class
- B63B2221/24—Joining substantially rigid elements together by means that allow one or more degrees of freedom, e.g. hinges, articulations, pivots, universal joints, telescoping joints, elastic expansion joints, not otherwise provided for in this class by means that allow one or more degrees of translational freedom, e.g. telescopic joints, not otherwise provided for in this class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
- B63H2021/171—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor making use of photovoltaic energy conversion, e.g. using solar panels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
- Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels
- Y02T70/5236—Renewable or hybrid-electric solutions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Wind Motors (AREA)
Description
BeschreibungDescription
Az: G 9o ok V12.6Az: G 9o ok V12.6
Stand der TechnikState of the art
Der neueste Stand der Technik auf dem Gebiet von teleskopartig aus- und einfahrbaren Segelflügeln auf Booten/Schiffen ist mit der Patentanmeldung non Herrn Ludwig Naake Az: P 23 56 ^26»3 vom 12.11.1973 gekennzeichnet. Sei:_r"iragflächensegel" wui-de jedoch niemals bisher gebaut.The latest state of the art in the field of telescopically extendable and retractable sail wings on boats/ships is identified by the patent application by Mr. Ludwig Naake, reference number P 23 56 ^26»3, dated November 12, 1973. However, this "airplane sail" has never been built to date.
Den neusten Stand der Technik in der Verwendung von Segelflügeln auf Booten zeigt jener Flügel, der I9Ö0 während der Regatta um den America-Cup eingesetzt wurde. Er hat jedoch eine flexible Ob'"fläche v.-d kann nicht verkleinert/gerefft werden- (Die "Yachtv· Ia-. '■' '88 S. £2 - 29 u. Nr 2o/88 £ bis 135).The latest state of the art in the use of sail wings on boats is shown by the wing that was used during the America's Cup regatta in 1980. However, it has a flexible surface - it cannot be reduced in size/reefed - (The "Yacht" in 1988, p. 2 - 29 and no. 20/88 £ to 135).
~.i e Japaner haben 1a Hände}ssch-ife mit Segelflügeln fester Oberfläche und Profil ausgerüstr ;·,~.The Japanese have equipped hand-held ships with sail wings with a solid surface and profile;·,
Auf6abeOn 6 abe
Die Erfindung stellt sich zur Aufgabe, die immer noch sehr komplizierten Vorgänge zur Bedienung der Segel an Bord zu vereinfachen und sie der Automatisierung zugänglich zu machen, die Fahrleistung der Seefahrzeuge unter Segel zu erhöhen, sie vermehrt für die Verwendung von Solargeneratoren zu erschließen und ihren CO -Ausstoß zu mindern.The invention aims to simplify the still very complicated processes for operating the sails on board and to make them accessible to automation, to increase the performance of seagoing vessels under sail, to make them increasingly available for the use of solar generators and to reduce their CO emissions.
VorteileAdvantages
Der statisch sich selbst tragende oegelflügel ist aerodynamisch erheblich effizienter zu gestalten als das herkömmliche fiigg und Tuchsegel, bei dem Masten, Wanten, Fallen und Falten schädliche Widerstände erzeugen. Die feste Außenhaut des Segelflügels ermöglicht die formgebung von vortriebsgünstigen Profilen und die Anbringung von Solargeneratoren in der Senkrechten an Bord an Vor- und xiinterwand des Flügels. Das versechsfacht die Fläche für Solargeneratoren an Bord, die bisher nur in der Waagerechten an Deck angebracht sind. Damit ist soviel iv-Enerftie zu gewinnen ii'ner Tag, dal!, es -;ich auf hooten lohnt, den fonsilen ,'!rennstoffrnotor aln Hilibantrieb 'lurch e J. &tgr;&igr; en l'l-Motor zu orr;etzcn.The statically self-supporting wing can be designed to be considerably more aerodynamically efficient than the conventional sail and cloth sail, where masts, shrouds, halyards and folds generate harmful resistance. The solid outer skin of the sail wing enables the shaping of profiles that promote propulsion and the attachment of solar generators vertically on board to the fore and rear walls of the wing. This increases the area for solar generators on board sixfold, which until now were only attached horizontally on deck. This means that so much energy can be gained in one day that it is worthwhile to use the solid fuel engine as auxiliary propulsion with a J&T oil engine.
Die Vereinfachun," <!<■»■ Jo.'-elmanöver und ihre .«ut &ogr;&igr;&pgr;,&iacgr; t i.'iie-The simplification," <!<■»■ Jo.'-el maneuvers and their .«ut &ogr;&igr;&pgr;,&iacgr; t i.'iie-
• &igr; ■ &igr; · ' '•&igr; ■ &igr; · ' '
Beschreibung
Az: G 9o o*Description
Az: G 9o o*
rung ermöglichen Verringerung der Bedienmannschaft, den Einsabz Ungeübter und ggf. Behinderter (Segeln als Therapie) .enable the reduction of the operating crew, the employment of inexperienced and possibly disabled people (sailing as therapy).
Die Drehbarkeit des Flügels um 360 und die stufenlose Einstellbar!^ii: der FlÜE-elfr':i*e r? nach Windstärke und deren Autün-atisierbarkeit erhöhen ä^c Sicherheit des Segeins erheblich und mindern die Kentergefahr von Booten. Das unter Seglern als gefährlich bekannte Halsemanöver wird völlig harmlos.The ability to rotate the wing through 360° and the infinitely variable adjustment of the wing to suit wind strength and its ability to be adjusted significantly increase the safety of sailing and reduce the risk of boats capsizing. The gybe maneuver , known to be dangerous among sailors, becomes completely harmless.
Die Automatisierung des Segelflügels ermöglicht in Kombination mit der heute üblichen Ruderautomatik und unter rechnergesteuerten Zeitvorgaben segeltaktisches Hanöverieren des ganzen Bootes ohne Menschenhand.The automation of the sail wing, in combination with the automatic rudder system that is common today and under computer-controlled time specifications, enables the entire boat to be maneuvered tactically without human intervention.
Sonnennergie kann auch währen der Liegezeit der Boote/ Schiffe im Hafen generiert werden.Solar energy can also be generated while the boats/ships are docked in the harbor.
Weiterbildungen der ErfindungFurther developments of the invention
Durch die V/eiterbidungen der Erfindung erhält nie Patentanmeldung von Herrn Naake vom 12.11.1973 eine neue Form und wesentliche Ergänzungen« Die Weiterbildungen nach Anspruch 1, 5 und 7 ermöglichen die Brückentauglichkeit eines Seglers, Rückwärtssegeln ein·" Bootes und Hinderung dee Wartungsaufwands. The further developments of the invention give the patent application by Mr. Naake dated November 12, 1973 a new form and significant additions. The further developments according to claims 1, 5 and 7 enable a sailor to be used on a bridge, to sail a boat backwards and to reduce maintenance costs.
Die lierufsschiffahrt verwendet den Segelflügel zusätzlich 7 um Hauptvertrieb, spart damit öl und mindert CO -Ausstoß. Die oportnchiffahrt erhält Unabhängigkeit im Brennstoff-Nachschub. The delivery shipping company uses the sail wing additionally 7 for main distribution, thus saving oil and reducing CO emissions. The port shipping company gains independence in fuel supplies.
Der Solar-Telekop-oegel-Flügel ist in Berufsochtf fahrt, Fischerei und oportschiffahrt gewerblich verwendbar.The solar telescopic wing can be used commercially in commercial shipping, fishing and port shipping.
Darstellung der ErfindungDescription of the invention
Figur 1 zeigt ein Ausführungsbeispiel der Erfindung, üwei 3olar-Teleskop-^egel-Flügel (1) sind an Bord eines ochiffes auf·· gestellt. Der vordere (l) ist ausgefahren, beim hinteren (2)Figure 1 shows an embodiment of the invention, two polar telescopic glider wings (1) are set up on board a ochiff. The front one (1) is extended, the rear one (2)
r. j..--; -···" &ogr; o'.'i'.'..'■:■■■,. 'Ji -<· f.-i i.rori und y.un: er.ceschoi/.'ii.rj.--; -···"&ogr;o'.'i'.'..'■:■■■,.'Ji-<· f.-i i.rori and y.un: er.ceschoi/.'ii.
■■ ■" !1 "·■■-; i i > U j 1;~■■ ■" !1 "·■■-; i i > U j 1;~
: .; &ogr; <Vi Vl .": .; &ogr; <Vi Vl ."
• i'.· ,·■:;: r i -:iir ■ ■ :,'mi .i.nioii ( "■) -,oi.-ron 'ii;n um &Oacgr; -'.-io; .·.■;! >',(■- ■'■'■\ i ·&Mgr; &udigr;·^:; . &pgr;.-; : ■ &Tgr;"&idiagr;&igr; <-.; ·&Iacgr; ' . i):i:; . >·:: ;.'"' &Ggr;&eegr; &Lgr; &ogr; &ggr; (&Oacgr; i' ".·-.; &iacgr;. f;s i ·! •i'.·,·■:;: ri -:iir ■ ■ : ,'mi .i.nioii ( "■) -,oi.-ron 'ii;n um &Oacgr;-'.-io;.·.■;!>',(■- ■'■'■\ i ·&Mgr;&udigr;·^:; . &pgr;.-; : ■ &Tgr;"&idiagr;&igr;<-.;·&Iacgr;' . i):i:; . >·:: ;.'"'&Ggr;&eegr;&Lgr;&ogr;&ggr;(&Oacgr;i'".·-.;&iacgr;.f;si ·!
&igr;· igur 1 ;;ew:t auch die ülemente i'ür die utliaiLuti(j cibs i;ewoi.:- neuen uolar-E-iJtromf; nac> Anspruch 9 S lJie oolar,;enoratu; on (^ die Batterie (G) und den E-llotor mit oclii ffswolle (7)· Figur 2 ^.eist dßc optimiorto i'rofil (8) des Segelflügels von oben. Die Tiefe dor. Profils an soiner concaven (9) und convexen !jeite (1&ogr;) nach Anspruch ?. werden aufgezeigt. Die .-isheibe mit Zahnkranz (11) nach Anspruch 6 ist dargestellt. Das Antriebsznhnrad (12) er:, üi;.i icht den anschlu,: von Stellmotoren zur Automatisierung najh Anspruch 11 und 12. Auch die Position der Wincch (1j5) ir den AuEi-und Einfahrm^ch ini.nmus nach Anspruch 5 und 6 wird auf,-;e«oigt. Figure 1 also shows the elements for the auxiliary lubrication (j cibs i;ewoi.:- new uolar electric motor according to claim 9. The functional unit (^ the battery (G) and the electric motor with the open end (7) Figure 2 shows the optimized profile (8) of the sail wing from above. The depth of the profile on the concave (9) and convex (10) sides according to claim ?. are shown. The disk with gear ring (11) according to claim 6 is shown. The drive gear (12) enables the connection of servomotors for automation according to claim 11 and 12. The position of the winch (1j5) for the extension and retraction mechanism according to claims 5 and 6 is also shown.
rif-ur 3 zeigt beispielhaft an ' oektoren (1^f) das teleskopartige Ineinanderschachteln der einzelnen Sektoren des S^prelr'lügels , 3ein»s Te] eskop-ilaat-Köhren-oys tems und dir Anbringung der einzelnen iiohre (15) ein den jeweils unteren Spanten/ Verstärkungen (16) d-r oektoren. Der Mar., t fuß (?) ir.i; daran gefestigter Scheibe mi* Zahnkranz sind in perspektivxscher Sicht dargestellt (11).Figure 3 shows, by way of example, the telescopic nesting of the individual sectors of the wing, a telescope-like tube assembly system and the attachment of the individual tubes (15) to the respective lower frames/reinforcements (16) of the wing. The mar., t foot (?) ir.i ; attached to it disk with toothed ring are shown in perspective view (11).
Figur k zeigt die Anordnung und Führung des Aus- und Einfahrmechanismus (19) in der Seitensicht und im Schnitt mitten durch den Flügel und h seiner Sektoren <1&Oacgr;, den Mastfuß (17), die Scheibe mit üahn'.:ranz (11) und die Winsch (13) für das SoilzugsysteiTi.Figure k shows the arrangement and guidance of the extension and retraction mechanism (19) in side view and in section through the middle of the wing and its sectors <1&Oacgr;, the mast foot (17), the disk with transverse gear (11) and the winch (13) for the sail hoist system.
Claims (1)
Az: G 9&ogr; o'f 'f12.6oc'iiu ! r. a &eegr;&ggr;. pr ; iche
Az: G 9&ogr;o'f'f12.6
Az: G 9o o'l- '1-12.6&ogr;c hu I;7,ans prvie he
Az: G 9o o'l- '1-12.6
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9004412U DE9004412U1 (en) | 1990-04-18 | 1990-04-18 | Solar telescope sail wings with computer-controlled automation for ships and boats |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9004412U DE9004412U1 (en) | 1990-04-18 | 1990-04-18 | Solar telescope sail wings with computer-controlled automation for ships and boats |
Publications (1)
Publication Number | Publication Date |
---|---|
DE9004412U1 true DE9004412U1 (en) | 1990-09-13 |
Family
ID=6852997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE9004412U Expired - Lifetime DE9004412U1 (en) | 1990-04-18 | 1990-04-18 | Solar telescope sail wings with computer-controlled automation for ships and boats |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE9004412U1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2903890A4 (en) * | 2012-10-05 | 2016-08-17 | Solar Sailor Pty Ltd | Opening rigid wing |
EP3235719A1 (en) * | 2016-04-22 | 2017-10-25 | Centre De Recherche Pour L'architecture Et Les Industries Nautiques | Lift generator device, corresponding wind-powered propeller, and corresponding propulsion installation. |
CN107651148A (en) * | 2017-09-26 | 2018-02-02 | 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) | Trigonometric expression sail |
JP2019014295A (en) * | 2017-07-04 | 2019-01-31 | 三井E&S造船株式会社 | Ship and ship maneuvering method |
WO2020035668A1 (en) * | 2018-08-14 | 2020-02-20 | Smith Darrell Stephen | A propulsion system for a boat |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE879215C (en) * | 1950-07-17 | 1953-06-11 | John Randolph James | sail |
DE2356426A1 (en) * | 1973-11-12 | 1975-05-15 | Ludwig Naake | Main sail for water craft - has trapezoidal symmetrical shape to take advantage of wind on both sides |
DD156356A1 (en) * | 1981-02-18 | 1982-08-18 | Eckard Hoeck | POWER DEVICE FOR EXPLOITING THE WIND FLOW FOR THE DRIVE OF SHIPS |
DE3107096A1 (en) * | 1981-02-21 | 1982-09-09 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Ship with largely rigid sail |
SU1049352A1 (en) * | 1982-02-22 | 1983-10-23 | Gladchenko Aleksandr V | Sails of ship |
JPS60139593A (en) * | 1983-12-28 | 1985-07-24 | Mitsubishi Heavy Ind Ltd | Control device for motor-powered sailboat |
EP0151231A2 (en) * | 1984-01-19 | 1985-08-14 | Lutz Dechend | Aerofoil type sail for sail vehicles |
SU1207898A1 (en) * | 1982-07-07 | 1986-01-30 | Николаевский Ордена Трудового Красного Знамени Кораблестроительный Институт Им.Адм.С.О.Макарова | Ship wind power plant |
SU1212870A2 (en) * | 1984-04-23 | 1986-02-23 | Gladchenko Aleksandr V | Ship sail equipment |
JPS61200091A (en) * | 1985-02-28 | 1986-09-04 | Osaka Sosenjo:Kk | Hard sail device for ship |
GB2234723A (en) * | 1989-06-22 | 1991-02-13 | James Harwood Crafer | Stowable rigid wingsail system |
-
1990
- 1990-04-18 DE DE9004412U patent/DE9004412U1/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE879215C (en) * | 1950-07-17 | 1953-06-11 | John Randolph James | sail |
DE2356426A1 (en) * | 1973-11-12 | 1975-05-15 | Ludwig Naake | Main sail for water craft - has trapezoidal symmetrical shape to take advantage of wind on both sides |
DD156356A1 (en) * | 1981-02-18 | 1982-08-18 | Eckard Hoeck | POWER DEVICE FOR EXPLOITING THE WIND FLOW FOR THE DRIVE OF SHIPS |
DE3107096A1 (en) * | 1981-02-21 | 1982-09-09 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Ship with largely rigid sail |
SU1049352A1 (en) * | 1982-02-22 | 1983-10-23 | Gladchenko Aleksandr V | Sails of ship |
SU1207898A1 (en) * | 1982-07-07 | 1986-01-30 | Николаевский Ордена Трудового Красного Знамени Кораблестроительный Институт Им.Адм.С.О.Макарова | Ship wind power plant |
JPS60139593A (en) * | 1983-12-28 | 1985-07-24 | Mitsubishi Heavy Ind Ltd | Control device for motor-powered sailboat |
EP0151231A2 (en) * | 1984-01-19 | 1985-08-14 | Lutz Dechend | Aerofoil type sail for sail vehicles |
SU1212870A2 (en) * | 1984-04-23 | 1986-02-23 | Gladchenko Aleksandr V | Ship sail equipment |
JPS61200091A (en) * | 1985-02-28 | 1986-09-04 | Osaka Sosenjo:Kk | Hard sail device for ship |
GB2234723A (en) * | 1989-06-22 | 1991-02-13 | James Harwood Crafer | Stowable rigid wingsail system |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2903890A4 (en) * | 2012-10-05 | 2016-08-17 | Solar Sailor Pty Ltd | Opening rigid wing |
US9527563B2 (en) | 2012-10-05 | 2016-12-27 | Solar Sailor Pty Ltd | Opening rigid wing |
EP3235719A1 (en) * | 2016-04-22 | 2017-10-25 | Centre De Recherche Pour L'architecture Et Les Industries Nautiques | Lift generator device, corresponding wind-powered propeller, and corresponding propulsion installation. |
FR3050430A1 (en) * | 2016-04-22 | 2017-10-27 | Centre De Rech Pour L'architecture Et Les Ind Nautiques | CARRIER GENERATING DEVICE, CORRESPONDING WIND THRUSTER, AND CORRESPONDING PROPULSION PLANT |
JP2019014295A (en) * | 2017-07-04 | 2019-01-31 | 三井E&S造船株式会社 | Ship and ship maneuvering method |
CN107651148A (en) * | 2017-09-26 | 2018-02-02 | 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) | Trigonometric expression sail |
WO2020035668A1 (en) * | 2018-08-14 | 2020-02-20 | Smith Darrell Stephen | A propulsion system for a boat |
US11820480B2 (en) | 2018-08-14 | 2023-11-21 | Darrell Stephen Smith | Propulsion system for a boat |
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