Abstract: A system of mechanically moving cool air into the hot attic space within a building structure such as a residence, which reduces the heat load on the habitable portion of the building structure, and thus allowing efficient cooling. The cool air is drawn from a vented crawl space, from a cellar or a basement space through applicable ducts, and a vertical duct or air chase upward into the attic using a controlled fan/blower air handling apparatus. The cool air then flows into the attic through applicable ducts and forces the attic air outside through exterior attic vents. In this system the possible irritants and contaminated crawl space air, basement air, or attic air is not vented into the habitable living space of the building, thus providing a healthier living environment for the inhabitants. This system can be adapted to applicable existing and new building structures of one or multiple floors.

Abstract: A stern mounted vertically adjustable propeller and rudder marine drive. The aft end of a propeller shaft, the propeller, the rudder and printle and a skeg are vertically moveable to adjust a boat's draft for use in the water and when trailering. A stern underwater slot in the boat hull and shaped to enhance water flow accommodates the propeller shaft which is driven by an inboard engine. As the propeller shaft passes through the hull slot it engages a flexible water seal mechanism which self adjusts or maintains itself in various up and downward positions; its pivotal point is common with the conterline pivotal point of a universal joint, which is attached to a drive shaft connected to the transmission of an inboard engine.