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Publication numberUS3650310 A
Publication typeGrant
Publication dateMar 21, 1972
Filing dateJul 16, 1970
Priority dateJul 16, 1970
Publication numberUS 3650310 A, US 3650310A, US-A-3650310, US3650310 A, US3650310A
InventorsEzra E Childress
Original AssigneeStewart & Stevenson Serv Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Combination boat trim tab and heat exchanger
US 3650310 A
Abstract
A combination boat trim tab and heat exchanger for an engine driven boat in which the trim tab body is hollow and has an inlet and outlet connected to the hollow interior and is adapted to be connected to the boat engine cooling system with elongate fins secured to the bottom of the outside of the body and axially aligned with the longitudinal axis of the boat. The hollow interior of the body including a serpentine passageway between the inlet and outlet thereby increasing the heat exchange area in contact with the engine cooling liquid. Elongate cooling fins secured to the interior of the bottom of the body for increasing the cooling surface.
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Description  (OCR text may contain errors)

United States Patent Childress 51 Mar. 21, 1972 COMBINATION BOAT TRIM TAB AND HEAT EXCHANGER 3,240,179 3/1966 Van Ranst ..l65/44 X Primary Examiner-Frederick L. Matteson Assistant Examiner-W. C. Anderson AttarneyJames F. Weiler, Jefferson D. Giller, William A. Stout, Paul L. De Verter, ll, Dudley R. Dobie, Jr. and Henry W. Hope [57] ABSTRACT A combination boat trim tab and heat exchanger for an engine driven boat in which the trim tab body is hollow and has an inlet and outlet connected to the hollow interior and is adapted to be connected to the boat engine cooling system with elongate fins secured to the bottom of the outside of the body and axially aligned with the longitudinal axis of the boat. The hollow interior of the body' including a serpentine passageway between the inlet and outlet thereby increasing the heat exchange area in contact with the engine cooling [72] Inventor: Ezra E. Childress, Houston, Tex.

[73] Assignee: Stewart & Stevenson Services, Inc.,

Houston, Tex.

[22] Filed: July 16,1970

[21] Appl.No.: 55,427

[52] U.S.Cl ..l65/44,1l5/0.5,ll4/66.5P [5|] lnt.Cl. ..F28t7/00 [58] FieldoiSearch ..l65/41,44;ll5/0.5; 114/665? [56] References Cited UNITED STATES PATENTS 2,386,803 10/1945 3,200,782 8/1965 3,327,776 6/1967 2,976,834 3/1961 Waldronetal. ..ll5/0.5

5 Claims, 4 Drawing Figures COMBINATION BOAT TRIM TAB AND I-IEAT EXCHANGER BACKGROUND OF THE INVENTION It is often desirable to provide sufficient cooling or to increase the cooling capacity of an engine operating a boat. Since the water in which the boat is operated provides a tremendous reservoir of cooling liquid, it would be useful to use the water for cooling the boat engine. However, since the waters in which boats operate are frequently corrosive or damaging, for example, salt water, to the internal parts of the engine, it is not generally desirable to use the boating waters as a direct cooling source. But, of course, any indirect cooling structure should be efficient, and should not interfere with the operational performance of the boat.

Since boat trim tabs do not interfere with, but on the contrary assist, the operational performance of a boat, the present invention is directed to providing a combination boat trim tab and heat exchanger for an engine driven boat which will increase the cooling capacity of the engine without subjecting the internal working parts of the engine to the water in which the boat operates and yet will not interfere with the operational performance of the boat. The combination boat trim tab and heat exchanger of the present invention is also directed to provide sufficient cooling for the engine both when the boat is moving and while it rests.

SUMMARY The present invention is directed to a combination boat trim tab and heat exchanger for an engine driven boat in which the trim tab body is adapted to be secured to a boat and has a hollow interior with an inlet and outlet connected to the hollow interior of the body and spaced from each other and adapted to be connected to the boat engine cooling system.

Another feature of the present invention is the provision of elongate cooling fins secured to the bottom of the outside of the boat to provide an increased heat exchange area and which are axially aligned with the longitudinal axis of the boat so as not to decrease the operational performance of the trim tab and boat.

Still another feature of the present invention is the provision of a hollow trim tab body having a cooling inlet and outlet wherein the body includes an internal serpentine passageway between the inlet and the outlet thereby increasing the heat exchange area between the cooling liquid and the body.

A still further feature of the present invention is the provision of internal elongate cooling fins secured to the interior of the bottom of the body wherein the interior fins are preferably aligned with the majority of a serpentine passageway.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary elevational view of an engine driven boat provided with a pair of combination trim tabs and heat exchangers,

FIG. 2 is an enlarged fragmentary elevational view of the improved trim tab of the present invention,

FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 2, and

FIG. 4 is an elevational view of the trim tab of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, and particularly FIGS. 1 and 2, the boat of the present invention generally includes an engine 12 driving a propeller 14 as is conventional.

One or more trim tabs generally indicated by the reference numeral 16 may be provided connected to the boat 10. The trim tab 16 may either be fixedly secured to the boat or as shown in FIG. 2 pivotally secured by one or more hinges l8 and movably positioned by a suitable means such as a hydraulic piston and cylinder assembly 20 connected at one end 22 to the boat and at a second end 24 to the trim tab 16.

The trim tab 16 of the present invention includes a hollow interior 25, as best seen in FIGS. 3 and 4, and includes an inlet 26 and an outlet 28 in communication with the hollow interior 25. The inlet 26 and outlet 28 are spaced from each other and adjacent opposite sides of the trim tab 16 to insure that the cooling liquid flowing from the inlet 26 to the outlet 28 comes' in contact with a greater area of the body of the trim tab 16 for increased heat exchange. As best seen in FIG. 1, the inlets 26 and outlets 28 from the trim tabs 16 are suitably connected by lines 30 and 32, respectively, to the cooling system of the boat engine 12. The trim tab 16 is of a suitable material such as metal having a high rate of thermal conductivity for heat exchange between the engine cooling fluid flowing through the interior of the trim tabs 16 and the water contacting the outside of the trim tabs 16.

Of course, while the boat 10 is at rest or idling, the boat 10 will sit lower in the water and both the bottom surface 34 and the top surface 36 of the trim tab 16 will be underwater. Since at idling or low speeds, the heat dissipation requirements of the engine cooling system are lower, the submersion of the trim tab 16 underwater, even though at rest, will provide a sufficient cooling area to satisfy the engine cooling requirements.

However, as the boat 10 gets underway, the action of the trim tabs 16 will cause the boat 10 to rise up on top of the water and only the lower surface 34 of the trim tab 16 will be in contact with the water. Therefore, in order to increase the heat exchange capacity of the trim tab 16 relative to the water, a plurality of the elongate cooling fins 38 are provided secured to preferably the entire bottom 34 of the outside of the trim tab body. In addition, the elongate cooling fins 38 are aligned with the longitudinal axis of the boat 10 to provide a structure which will not interfere with the operational performance of the trim tab 16 nor the boat 10.

In order to further increase the cooling capacity of the trim tab 16, and as best seen in FIGS. 3 and 4, partitions 40, 42 and 44 are provided in the hollow interior 25 of the trim tab 16 whereby the hollow interior 25 forms a serpentine passageway between the inlet 26 and 28 since the barriers 40, 42 and 44 alternately extend from opposite sides, but do not extend entirely across the hollow interior 25 of the trim tab 16. Therefore, the engine cooling fluid flowing from the inlet 26 to the outlet 28 will contact a greater surface area and thus increase the heat exchange cooling area between the cooling liquid and the body of the trim tab 16.

Additional cooling may be provided if necessary by providing elongate cooling fins 50 secured to the interior of the bottom 34 of the trim tab 16. Preferably, the interior cooling fins 50 are generally aligned with the major passageways of the serpentine path of flow of the cooling liquid from the inlet 26 to the outlet 28.

In use, and as previously indicated, with the boat 10 at rest and idling the entire trim tab 16 will be submerged in the water and even though not in moving contact with the water will provide sufficient cooling to cool the engine under light loads. And when the boat 10 is underway and the engine is under a heavier load, while only the bottom 34 of the trim tab 16 will be in contact with the water, sufficient heat exchange will be provided by the water in which the boat travels moving across the exterior cooling fins 30 while the engine cooling fluid flows through the interior 25 of the trim tab 16. In addition the serpentine path of flow and the interior cooling fins 50 increase the heat exchange.

The present invention, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned as well as others inherent therein.

What is claimed is:

l. A combination boat trim tab and heat exchanger for an engine driven boat comprising,

a generally horizontally positioned trim tab body having means adapting said body to be secured to a boat and having a hollow interior,

an inlet and an outlet connected to the interior of the body and spaced from each other and adjacent opposite sides elongate cooling fins secured to the interior of the bottom of I the body.

4. A combination boat trim tab and heat exchanger for an engine driven boat comprising,

a flat bottom generally horizontally positioned trim tab body having means adapting said body to be secured to a boat,

said body being hollow and including an inlet and an outlet connected to the interior of the body and spaced from each other and adjacent opposite sides and adapted to be connected to the boat engine cooling system, said hollow interior of the body including a serpentine passageway between the inlet and outlet thereby increasing the heat exchange cooling area between the cooling liquid and the body, elongate fins secured to the bottom of the outside of the body and axially aligned with the longitudinal axis of the boat, and elongate cooling fins secured to the interior of the bottom of the body. 5. The apparatus of claim 4 wherein the interior cooling fins are generally aligned with the serpentine passageway.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2386803 *Nov 26, 1943Oct 16, 1945William B JutteMeans for cooling fluids on boats and the like
US2976834 *Dec 4, 1958Mar 28, 1961Sam SchleiferMarine heat exchanger
US3200782 *Nov 6, 1964Aug 17, 1965Thomas Alburt BPower boat attachment
US3240179 *Feb 12, 1964Mar 15, 1966Ranst Cornelius W VanCooler
US3327776 *Oct 24, 1965Jun 27, 1967Trane CoHeat exchanger
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3841396 *Jun 12, 1973Oct 15, 1974Birk DFinned heat exchanger and system
US3888412 *Apr 17, 1973Jun 10, 1975Kenilworth Research & Dev CorpApparatus for heating the fluid in a windshield washer system
US4519336 *Aug 23, 1983May 28, 1985Mason David ARear extension for boat hull
US4674984 *May 9, 1986Jun 23, 1987Caddick Mary JWater craft and method for removing weeds and pollutants from navigable waters
US5327848 *Mar 25, 1991Jul 12, 1994Hannon Jr John LMethod and apparatus for keeping surfaces organism free
US5340345 *Jul 26, 1993Aug 23, 1994K & B Mfg, Inc.Water pickup and cooling apparatus for boat drive systems
US5474013 *Mar 17, 1995Dec 12, 1995Trim Master Marine, Inc.Trim tab auto-retract and multiple switching device
US5832863 *Jun 3, 1997Nov 10, 1998Sherlock; JohnTrue track trim blades
US5863230 *Sep 26, 1996Jan 26, 1999Morrison; Douglas M.Universal marine drive apparatus and uses thereof
US5931217 *May 20, 1998Aug 3, 1999R.W. Fernstrum & CompanyMarine heat exchanger
US6089177 *Jun 8, 1998Jul 18, 2000Mueller; PeterTrim tab and variable-exhaust system especially for motor boats and motor yachts
US6167830Dec 6, 1999Jan 2, 2001Don T. PilgerBoat trim tabs
US6485339 *Jul 21, 1998Nov 26, 2002Siemens AktiengesellschaftElectric motor pod drive system for a vessel with a cooling device
US6544085 *Oct 19, 2000Apr 8, 2003Bombardier Inc.Watercraft having a closed coolant circulating system with a heat exchanger that constitutes an exterior surface of the hull
US7011142Feb 25, 2003Mar 14, 2006Dana Canada CorporationFinned plate heat exchanger
US7025127Jul 2, 2003Apr 11, 2006Dana Canada CorporationBaffled surface cooled heat exchanger
US7094118Mar 23, 2005Aug 22, 2006Brunswick CorporationHeat exchanger for a marine propulsion system
US7128025Oct 25, 2004Oct 31, 2006Brp Us Inc.Dual temperature closed loop cooling system
US7182125Nov 28, 2003Feb 27, 2007Dana Canada CorporationLow profile heat exchanger with notched turbulizer
US7213638Apr 9, 2004May 8, 2007Dana Canada CorporationHeat exchanger with flow circuiting end caps
WO2004005825A1Jul 3, 2003Jan 15, 2004Dana Canada CorpBaffled surface cooled heat exchanger
Classifications
U.S. Classification165/44, 440/61.00T, 114/286, 440/88.00R, 440/88.00C, 440/88.0HE, 440/88.00M
International ClassificationB63B39/06, B63B39/00, F28F3/12, F28F3/00
Cooperative ClassificationB63H21/14, B63H20/245, B63H20/285, B63H21/10, F28D1/022, F28F3/12, B63B39/061, B63H21/38
European ClassificationF28D1/02A6, F28F3/12, B63B39/06B, B63H21/14, B63H20/28B, B63H20/24B, B63H21/38