Submerged Water-Jet Marine Propulsion
To reduce fuel consumption and associated environmental impact of marine vessels, this submerged water-jet marine propulsion system utilizes a commercially proven, positive displacement pump; specifically, a lobe pump that has dual helical rotors to move and hydrostatically pressurize the water rather than an axial flow impeller. Flow from the pump is discharged longitudinally beneath the vessel through a discharge opening that contains a movable center-body. Translation of the center-body results in a change in the cross-sectional area of the discharge opening, thereby creating a variable area discharge. The liquid flow through the system is essentially linear, thus eliminating the radial flow component inherent in propeller propulsion.
Water flows through the inlet grille into the rotating chambers of the lobe pump, where both potential and kinetic energy is added to the liquid stream. Dynamic forces of the liquid stream try to force the discharge center-body into a fully extended position, but a double-acting hydraulic piston allows the liquid throttling mechanism to modulate to a pre-determined discharge area. To reverse the vessel, simply reverse the pump rotation.
Truck Trunk Storage Unit
Calgary, Alberta, Canada
The Truck Trunk is a lockable and movable storage chest that is mounted to a truck bed on rails. It can be positioned securely at any point in the truck bed, but is normally all the way forward (immediately behind the cab). On the top at either side is a two-way lever that is spring-loaded to rest in the middle. Sliding the lever either forwards or backwards releases the locking mechanism and allows the Truck Trunk to slide freely along the tracks with ease in the direction of the lever pull. Releasing the handle immediately engages the locking mechanism.
Lowering the lift gate on the truck and positioning the truck trunk at the rear of the bed allows for easy access without having to climb into the truck bed. The Truck Trunk itself has a locking door for security. It is sealed against the elements so that items placed inside remain dry and clean.