초록 ▼

A laterally extending trim vane is mounted for rotation about a horizontal axis on a submerged portion of a stern-drive propulsion unit housing, substantially within the slipstream of the propeller. The trim vane is mounted on structure which depends downwardly from a rearward part of a horizontally

A laterally extending trim vane is mounted for rotation about a horizontal axis on a submerged portion of a stern-drive propulsion unit housing, substantially within the slipstream of the propeller. The trim vane is mounted on structure which depends downwardly from a rearward part of a horizontally elongated intermediate portion of the housing. The aft location of the trim vane provides a relatively large moment arm for the vertical trim force. Hence, for a given moment, the aft position requires less force. Also, the propeller slipstream velocity relative to the vane is considerably higher than the speed of the boat. The aft location of the vane, providing the longer moment arm, and the utilization of slipstream water, providing a relatively high velocity of motive fluid, make it possible to make the control surface of the vane quite small.

대표청구항 ▼

In combination, a marine sterndrive propulsion unit adapted for attachment to a transom located mount comprising a generally vertically elongated housing which during use is positioned immediately rearwardly of the transom, said housing having a lower portion which during use is submerged, said hous

In combination, a marine sterndrive propulsion unit adapted for attachment to a transom located mount comprising a generally vertically elongated housing which during use is positioned immediately rearwardly of the transom, said housing having a lower portion which during use is submerged, said housing further including a rearwardly projecting generally horizontally elongated mid-portion, a propeller supported by said lower portion, and adjustable trim tab means comprising: a laterally extending vane member; support strut means depending from a rear part oF the horizontally elongated mid-portion of said housing, said support means mounting said vane member onto said housing and positioning said vane at a location below the water line, aft of the propeller and substantially within the slipstream of the propeller for rotation about a horizontal axis, with opposite portions of said vane member projecting outwardly from opposite sides of said depending support strut means in wing-like fashion; and control means for rotating said vane in position about said horizontal axis, to change the ange of attack on said vane member.