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An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior surface of the cavity, bend in response to the

An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior surface of the cavity, bend in response to the cyclical variation between the rotor and the oval cavity in order to define four chambers and form a sliding seal with the interior surface. As the vanes revolve with the rotating rotor, the volumes of these four chambers vary cyclically and enable the four phases of an approximate Otto Cycle. The engine is more efficient than a conventional, reciprocating engine because the expansion force of the combustion gas acts directly on the rotating element with a minimum of moving parts.

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An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior surface of the cavity, bend in response to the

An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior surface of the cavity, bend in response to the cyclical variation between the rotor and the oval cavity in order to define four chambers and form a sliding seal with the interior surface. As the vanes revolve with the rotating rotor, the volumes of these four chambers vary cyclically and enable the four phases of an approximate Otto Cycle. The engine is more efficient than a conventional, reciprocating engine because the expansion force of the combustion gas acts directly on the rotating element with a minimum of moving parts. rtion, said support member having a plurality of stanchions, each of said stanchions downwardly extending from said base portion, said stanchions being adapted for supporting said base portion on a support surface; a plurality of wall members being coupled to said base portion of said support member, said plurality of wall members defining a containment space, said containment space being adapted for holding water and fish; said support member having a plurality of drain portions, each of said drain portions being coupled to said base portion of said support member, said drain portions being in fluid communication with said containment space such that said drain portions are adapted for draining water out of said containment space; and a collective valve member being in fluid communication with a valve assembly of each of said drain portions, said collective valve member being adapted for providing selective control of the amount of water draining through each of said drain portions. 2. The aquarium water circulation system as set forth in claim 1, further comprising: a screen member being selectively positionable on said base portion of said support member, said screen member being positioned adjacent to a bottom end of said containment space, said screen member being adapted for supporting gravel and aquarium decorations placed within said containment space defined by said wall members such that said screen member is adapted for preventing the gravel and aquarium decorations from falling into said drain portion. 3. The aquarium water circulation system as set forth in claim 2, further comprising: said screen member having a plurality of apertures, each of said apertures extending through said screen member, said apertures being adapted for permitting water within said containment space to drain into said drain portion while keeping the gravel and the aquarium decorations positioned within said containment space. 4. The aquarium water circulation system as set forth in claim 2, further comprising: said screen member having a plurality of slots, each of said slots extending through said screen member, said slots being adapted for permitting water within said containment space to drain into said drain portion while keeping the gravel and the aquarium decorations positioned within said containment space. 5. The aquarium water circulation system as set forth in claim 1, further comprising: a filter assembly being in fluid communication with said drain portion, said filter assembly being in fluid communication with said containment space defined by said wall members, said filter assembly being adapted for filtering water drained from said containment space through said drain portion of impurities before reintroducing water into said containment space. 6. The aquarium water circulation system as set forth in claim 1, further comprising: each of said drain portions having an open upper end and an open free end, said open upper end having a greater area than said open free end such that each of said drain portions are substantially funnel shaped, said open upper end being positioned adjacent said base portion of said support member. 7. The aquarium water circulation system as set forth in claim 1, further comprising: said valve assembly of each of said drain portions being positioned at an open free end of an associated one of said drain portions opposite said base portion of said support member, said valve assembly being adapted for selectively controlling draining of the water from said containment space defined by said wall members. 8. The aquarium water circulation system as set forth in claim 1, further comprising: a filter assembly being in fluid communication with said drain portions, said filter assembly being in fluid communication with said containment space defined by said wall members, said filter assembly being adapted for filtering water drained from said containment space through s